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LIBRARY

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AGRICULTURAL

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Fertílizadon

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Fertilización del Tabaco.

PUBLICADO POR

La GERMÁN KALI WORKS,

Calle de Nassau, No. 95,

NUEVA YORK,

Estados Unidos.

AVISO.

El presente folleto se remitirá gratis á todo el que lo solicite
así como los siguientes:

"TROPICAL PLANTING,"

"FERTILIZING SUGAR GANE,"

"EXPERIMENTS WITH FERTILIZERS,"
"GUIA DEL AGRICULTOR,"
"TOBACCO CULTURE,"
"PLANT FOOD,"

y el "THE COW PEA."

A cuyo efecto bastará dirigirse al

GERMÁN KALl WORKS,

93 Nassau Street,

Nueva York, Estados Unidos.

Importancia de los Fertilizantes en las Vegas de
Tabaco, y algunas observaciones respecto al
modo más ventajoso de su aplicación al terreno»

TODO cultivador de tabaco debe tener muy en cuenta
que siendo dicha planta de crecimiento rápido y ex-
uberante, demanda gran cantidad de aquellas sustancias
que contiene el terreno y que son indispensables á su nu-
trición. Si esas sustancias, que constituyen el alimento de
la planta, y que esta ha quitado en cada cosecha, no se de-
vuelven al terreno oportuna y acertadamente, no es posible
esperar buenos resultados, ni en la calidad del producto, ni
en el rendimiento promedio de las siembras."

Respecto á esto, y como ilustración práctica, tenemos el
gusto de ofrecer aquí el resultado de minuciosos experi-
mentos llevados á cabo en la Estación Experimentadora del
estado de Massachusetts, y en la de Florida (Estados
Unidos). La primera Estación citada está bajo la acertada
dirección del Dr. Goessman, y la de Florida está á cargo
del Profesor Stockbridge. Ambos han realizado un trabajo
de investigación de suma utilidad para los cultivadores de

4 FERTII.IZACION DEL TABACO.

tabaco, y siendo competentes en la materia, la proporción
que aconsejan para el empleo de los fertilizantes debe adop-
tarse sin vacilar un momento. Según, pues, la citadas in-
vestigaciones, el ácido fosfórico, el nitrógeno y la potasa,
deben entrar en las proporciones siguientes, por caballería:

Ácido Fosfórico Nitrógeno Potasa

El Dr. Goessman aconseja, 1.980 Ibs. 3.300 Ibs. g.giolbs.
El Prof . Stockbridge " 2.410 " 5.950 " 9.910 "

Promedio por caballería, 2.215 Ibs. 4.630 Ibs. 9.910 Ibs.

Es decir, que una mezcla que contuviese como unas
19.800 libras de sulfato de potasa superior (96^), unas 28.000
libras de nitrato de soda, y unas 18.000 libras de ácido fos-
fato (12^) vendrían á formar las cantidades de ácido fosfó-
rico, nitrógeno y potasa arriba indicados.

Toda vez que el análisis químico nos revela la cantidad
de alimento de la planta contenida en el tabaco, esta cir-
cunstancia sirve de base para determinar, con relativa cer-
teza, tanto la clase como la cuantía del fertilizante que debe
emplearse. Y como es natural, al calcularse el alimento
asimilado por la planta es necesario tener en cuenta, no
solo la boj a, sino el tallo todo; pues si bien es cierto que en
la hoja se cifra todo el interés, esta no puede crecer sin el
tronco, raíces, etc. I,a planta, en conjunto, ha sido anali-
zada por el Profesor Stockbridge, en la Estación Experi-
mentadora de Florida, con el resultado promedio siguiente:

Ácido fosfórico, 0.99 por ciento; Nitrógeno, 2.58 por
ciento; Potasa, 4.34 por ciento, contenido en dicha planta.

FERTILIZACIÓN DEL TABACO. 5

Esto nos indica que la siembra requiere para su nutri-
ción, y que realmente se asimila, una proporción de 260
libras de nitrógeno y 440 de potasa por cada 100 de ácido
fosfórico. Y como este último componente suele cambiarse
en formas insolubles al incorporarse al terreno, bueno es
tener eso presente y compensarlo al preparar ciertos ferti-
lizantes especiales. En cambio, sucede á veces, que el cul-
tivo alternado de las leguminosas acumula el nitrógeno en
el suelo, en cuyo caso, si el empleo del nitrógeno en el fer-
tilizante se prodigase algo, podría producir tal exuberancia
en la hoja que más bien sería en detrimento de su calidad.
Débese á esto el que muchos cultivadores de tabaco de
reconocida experiencia empleen mayor proporción de ácido
fosfórico, y menor de nitrógeno, que la que podría dedu-
cirse como indicada por la composición química de la ci-
tada siembra.

Todo esto lo ha tenido en consideración el Profesor
Stockbridge al recomendar su fórmula para el empleo de
los fertilizantes, porque con dicha fórmula se reponen las
sustancias nutritivas (según previos análisis) que una cose-
cha normal de tabaco necesita asimilarse de cada caballería
de tierra sembrada de tabaco.

El resumen de autoridades reconocidas acerca de este
asunto puede expresarse en la forma siguiente :

Las sie7nbras de tabaco reclaTnan el ácido fosfórico en pequeTia
proporción^ mayor la de 7iitrógeno, y en proporciÓ7i Tmtcho más
grande la potasa: de esta última y en rigor ^ en ca?itidad mucho
más crecida que ninguiia otra planta de cultivo.

6 FERTILIZACIÓN DEL TABACO.

Una buena práctica en el cultivo inteligente del tabaco
aconseja la proporción siguiente : Nitrógeno de 4 á 6 partes:
Potasa de 8 á 15 y de I á 3 de Acido fosfórico.
O para decirlo en forma más concisa :
Amoniaco, de 4 á 5 por ciento.
Potasa, de 8 á 9 "

Acido fosfórico aprovechable, de 2 á 4 por ciento.

Es muy importante recordar siempre que el valor de los
fertilizantes del comercio es relativo, porque ha de ser en
relación directa del nitrógeno, la potasa, y el ácido fosfórico
aprovechable que contengan y siempre que se apliquen
dichos ingredientes en su debida proporción . Y téngase pre-
sente que si hay exceso en la cantidad que se aplique de
uno de estos tres componentes del alimento de la planta,
el daño que resulte no se subsana por la falta de cualquiera
de los otros en el fertilizante : la proporción de los tres es
esencialísima, como lo es también, para obtener el mejor
resultado, el origen de dichos ingi'edientes. Por ejemplo ;
Potasa: debe escogerse siempre el "sulfato de potasa," y
aun mucho mejor si es de calidad conocida por "sulfato de
potasa de 96^." Otras formas, tales como el muriato de
potasa, y Kainit (que contienen gran cantidad de el orino )
no deben aplicarse nunca al tabaco, toda vez que su influen-
cia es nociva para la hoja, resultando "mal ardedora."

Para producir un fertilizante de la proporción antes in-
dicada, es decir, que contenga 5^ de amoniaco, 9^ de potasa,
y 4^ de ácido fosfórico aprovechable, los siguientes compo-
nentes deben entrar en una tonelada :

TABACO SIN FERTILIZAR. FINCA DE EXPERIMENTOS "SOUTHERN PINES,'

CAROLINA DEL NORTE.

TABACO, FERTILIZADO CON POTASA, ÁCIDO FOSFÓRICO Y NITRÓGENO

(FERTILIZADOR COMPLETO) FINCA DE EXPERIMENTOS

"SOUTHERN PINES," CAROLINA DEL NORTE.

FKRTlIvIZACION DEIv TABACO.

Pulpa de Semilla de algodón, iioo libras.
Sulfato de potasa (96^) . 350 *'
Ácido fosfato 550 *'

Total, . 2000 libras.

¿ Y qué cantidad de la anterior composición debe apli-
carse á una extensión dada de terreno ? No es posible
prefijar dicha cantidad, que naturalmente varia según el
país donde se aplique. No obstante, puede decirse que de
33 mil libras á 49 mil, por caballeria, aseguran un resultado
ventajoso. Los cultivadores de tabaco del estado de Con-
necticut, usan, por lo general, hasta 99 mil libras por
caballeria. La cifra de Connecticut no debe seguirse
escrupulosamente en un país como Cuba, por ejemplo,
donde es proverbial la riqueza de sus vegas de tabaco; pero
sí puede servir de base para los experimentos particulares
de los cultivadores, que si se llevan á cabo con inteligencia,
muy pronto podrán averiguar la cantidad de fertilizantes de
la proporción indicada que ha de darles el mayor beneficio,
tanto en el rendimiento de la cosecha, como en la calidad
del producto. No hay inversión de dinero más acertada
que aquella destinada á abonar la tierra, no solo porque asi
recupera sus elementos de riqueza natural, empobrecidos
por el cultivo, sino también porque siempre que la fertiliza-
ción se haga en la debida forma y co7i los fertilizantes
adecuados., el resultado superará con creces la loable ambi-
ción del agricultor.

:^KRTlIvlZ ACIÓN DKlv TABACO.

Componentes de las sustancias fertilizantes que

se emplean para obtener nitrógeno.

También su proporción.

Nitrato de soda

Sulfato de amoniaco

Sangre seca (Superior)

Sangre seca (Inferior)

Residuos concentrados de

tanques (fondajes)

Fondajes

Fondajes

Residuos de pescado seco. . .
Pulpa de semilla de algodón

Pulpa de castor

Palillos de tabaco

Nit.

15 á 16
19 á 22
12 á 14^

10 á II

11 á I2|
5 á 6

7iá9
9i á II

5 á 6
2 á 3

Equiva-
lente en
Amoniaco.

18 á ig|
23 á 26
I4i á 17^
12 á 14^

i3i á 15
6á 7i
9 á II

ni á i3i

8 á 9

6 á 7

2^ á4

Potasa
(K2O.)

5 á

Acido fosfórico
Total.

3 a 5

I á 2
II á 14

8| á io|

6 á 8

2%

2%

Como 1%

ídem ídem para obtener el ácido fosfórico.

Roca fosfórica de Carolina del Sur.

Fosfatos ácidos de ídem

Fosfatos de guijarros de Florida. . .

Fosfatos ácidos de ídem

Fosfatos de Tenesí

Fosfatos ácidos de ídem

Hueso calcinado (vivo)

Hueso calcinado (disuelto)

Hueso calcinado (pulverizado)

Guano del Perú

Aprovechable.

12^ á 15

15 a 17

14 a 19

15 a i!
5 á 8

Insoluble.

26 á 27
I á 3

26 á 32
I á 3

34 á 39
I á 3

32 á 35

1 á 2
15 á 17

2 á 7

FERTILIZACIÓN DEI/ TABACO.

Componentes de las sustancias fertilizantes que
se emplean para obtener la potasa.

Muriato de potasa

Sulfato de potasa (Superior)
Sulfato de potasa-magnesia.
Carbonato de id. id.

Kainit

Sylivinit

Cenizasdesemilladealgodón
Nitrato de potasa ó salpetre.
Cenizas de madera (vivas). .
Cenizas de madera (lejias). .
Palillos de tabaco

Potasa para

(K,0.)

tantopor ciento.

50
50 á 55
27 á 30

16 á 20
20 á 30

43 á45
2 á 8
I á 2
5 á8

Cal, tanto
por ciento.

0.85

I . 12

10,

30 a 35

35 á40

3-5

Amonia,
t. p. c.

16 á 17

2i á3i

Clorino,
t. p. c.

45 á48
0.3 á 1.5
1.5 á 2.5

30 a 32
42 á 46

Tipos promedios de la composición de los abonos
orgánicos, tales como de establo, etc.

Nitrógeno.

Equivalente

en
Amoniaco.

Pota.

Cal.

Estiércol de vaca (fresco). . .

0.34

0 .41

0.40

0.31

Id. de caballo (fresco)

0.58

0.70

0.53

0.21

Id. de carnero ( id. )

0.83

1 .00

0.67

0.33

Id. de cerdo ( id. )

0.45

0.54

0.60

0.08

Id. de gallina ( id. )

0.63

1.98

0.85

0.24

Abonos mezclados de esta-

blo, (pen) abonos de corral

etc

0.50

0,60

0.63

0.70

VN2 * 00., MIMTIM, 14 MOAPWAY, NSW V4N

ORANGE CULTURE.

{p

Published by

GERMÁN KALI WORKS,
Neav York, X. Y. Baltimore, Md. Chicago, III. Havana, Cuba.

Orange Culture will be sent free to Growers or Persons
interested in Orange Growing,

Some other important books on agricultural subjects:

Principies of Pt'ofitahle Farjning,
Potash in A griculture,
Farniers' Ginde,

Farmers' Note Book,
Cottoii Culture,
Tobacco Culture,
Strawberry Culture,
Tropical Planting,
Stasafurt Tndustry,
Fertilizing Tobacco ^
Sugar Cañe Culture^
Sugar Beet Culture,
The Cow Pea,
Plant Food,

Truck Farming,

Why the Fish Failed,
Valué of Swamp Lands.

If 3'ou wish any of these book, you can obtain the same
free of charge b}^ writing to the Germán Kali WorKvS, 93 Nassau
Street, New York, orto Baltimore, Md., Continental Building, or
Chicago 111., 562 Monadnock Block, or Havana Cuba, West Indies.

INTRODUCTION.

THE orange is as staple as the apple. It is the standard
dessert fruit of America. The demand for it is constant
and always increasing. To meet this demand the business
of orange growing has reached enormous proportions, and
has become the leading industry of large sections. Califor-
nia and Florida are, and doubtless will remain, the two
most important centers of orange production. Other States
and territories, however, are becoming rccognizedfactors in
the production of this íruit. Alabama, Louisiana, Texas
and Arizona possess commercial groves which are being
increased.

The present crop of California may be safely placed at
13,000,000 box-ís. The Florida crop for the season of 1903
was approximately 2,000,000 boxes. This is hardly one half
of the estimated crop for the year 1894, when the Florida
groves were so nearly ruined by the "great freeze." Groves
are rapidly increasing in the State, so that the crop has
almost reached its pristine importance. The annual crop
of the country now represents about 18,000,000 of dollars
to the growers.

Entirely aside from the commercial importance of the
industry and the profits offered by the business, orange
growing possesses fascinations making the occupation well
nigh irresistible to those once subjected to its magic in-

fluence. Succeeding only in regions with climatic conditions
nearly ideal for health and pleasure, with a harvest time
when most other fruits and plants are in their unattractive
period of rest, with the glistening dark green foliage con-
trasted with golden fruit, with the mild warmth of winter
sunshine, with bloom of flowers and song of birds to add to
the enchantment, with long periods of comparative leisure
between the seasons of chief activity, with a staple product
and ever growing demand, the orange grovver is confronted
by as few vicissitudes and as many pleasures as fall to the
lot of the producers of any natural product.

Although the business demands a high degree of skill,
intelligence and professional ability of those engaged in it,
any one who is able to give the study and care to a general
business necessary to success, can successfully grow
oranges. There is a constant accession of new growers,
seeking the rewards and health offered by the orange
grove.

It is the object of this little work to place at the dis-
posal of the experienced and inexperienced alike, the best
and latest developments of successful practice. Its endeavor
is to make available in simple form, the established facts
and principies, on whose application the success of the
business must depend.

ADAPTATIONS.

Climate. The climatic adaptations of the orange tree
are more important, as they are more definitely defined than
are its relations to soil or other conditions. In both Cali-
fornia and Florida, it is found growing on soils widely
different in compostion and properties.

Being a semi-tropical product its climatic restrictions
are chiefly those of temperature. Its degree of hardiness
varies materially with varieties. Condition of he tree at
the time it is subjected to cold exerts great inflaence on its
resistant power. The mínimum normal temperature of any
locality, is the first and most important point in determining
its adaptation to orange culture. The tree whcn dormant,
may be safely subjected to a temperature of 20 degrees.
Under favorable conditions, particularly cloudy weather
foUowing the cold, a temperature of 14 degrees above zero,
for a few hours, results in no serious harm to trees. Either
of these temperatures would inevitably be followed by de-
foliation. Neither elevation ñor latitude controls these
conditions, since temperature is often influenced by purely
local conditions, especially those modifying or directing aii'
currents.

SuíRciency of water supply is the other important cli-
matic consideration in locating orange groves. Being an
evergreen, its demand for water is continuous, since exha-

6 WATER SUPPLY.

lation from the leaves goes on even while the tree is dor-
mant, though not to the same extent as during the growing
season. Nature makes the important suggestion of placing
her wild groves only on moist hammock soils. Though the
orange was first found growing on low, moist soil, there is
no tree that will grow and do wcU on a greater variety of
soil. There are orange groves planted on land so low that
it is necessary to place the trecs on a ridge to keep the
roots from being in standing water and give ampie drain-
age ; there are other groves located on high pine land
where water in the wells stands at twenty feet from the sur-
face and still others in sections where rains are practically
unknown. The tap root of the orange tree enables it to
seek and find water at a considerable depth, but where
there is not an adequate rainfall, irrigation must be made
to supply the natural deficiency.

In California artificial watering is depended on exclu-
sively. In Florida, where the rain-fall is seldom less than 50
inches, spray irrigation is sometimes provided as insurance
against dam.age from drought, oftentimes serious just after
the young fruit sets.

5oil. Though in most orange growing sections, the
term "Orange Soil" is in common use, it will be found
that in even limited localities the ñame is not applied to
any particular soil, possessing distinct properties. Orange
soils may be accepted as including any good arable soil free
from standing water, and possessing responsiveness to cul-
tivation and fertilizing. In Florida such soils include the

SOILS. 7

great variation between the sandy pine ridges, the retentive
" hammocks " and the nearly solid porous-limestones of tl.e
East Coast. In California such extremes as the gray gravel
of the foot hills and the alluvium of the river bottoms seem
equally adapted to the orange, when the trees are provideá
with the other requisites to normal development.

The character of the root system of the orange gives an
important suggestion as to its soil adaptations. This tap-
root is of a very distinct character. It will not survive
Standing water, ñor exist in either natural or artificial
hard-pan. Soils possessing either of these conditions, should
be excluded from consideration as sites for groves.

PROPAGATIOR

Seedlings. The orange is not indigenous to the Amer-
ican continent. Wild trees of two distinct species, the
Citrus aurentum and the C. vulgaris, respectively, the
sweet and sour orange, have grown wild in Florida ever
since the first English speaking settlers became familiar
with the country. They were, ñowever, both introduceü by
early Spanish explorers. Finding all their requirements
supplied by nature, they throve for severa! centuries as wild
occupants of the land.

The sour orange is so nearly worthless, as to remain
commercially unimportant. The sweet seedling constituted
most of the early groves which gave Florida fame as an
orange producer. Most of the groves of to-day are the

8 SEEDLINGS.

result of perpetuating a distinct type or quality of seedling,
by budding it on a root or stock of diíferent origin and
unlike properties.

The seedling orange, like the peach or other fruit, does
not perpetúate its own qualities in the next generation.
The fruit of a tree need not resemble the fruit producing
the seed from which the tree grows. The planting of seed,
therefore, merely assures a tree, but oífers no basis for fore-
telling the character of its fruit. A few seedling trees
produce fruit as good, or better, than that from which the
seed carne. Desirable fruits originating in this way are
perpetuated by budding or grafting. That is, by trans-
ferring growing buds of the tree desired, to the growing
wood of the tree whose product is to be thus changed.

Stocks. These are the trees, usually the entire roots of
young trees, to which the growing buds of the kind desired
are transferred. The result is a tree producing fruit wilh
the properties of the tree from which the bud was taken.
AUhough the fruit foUows the character of the bud, the
tree itself is very materially influenced by the nature of the
stock on which it grows. This influence is particularly no-
ticed in the matter of hardiness, and resistance to cold.
The C. trifoliata stock greatly increases the cold-resisting
power of the tree budded on it. The C. vulgaris used as
stock for budded trees renders them comparatively immune
to the mal de goma^ gi^"^ disease, so serious in some orange
sections.

It is particulariy worthy of note that the budded tree

STOCKS-GRAFTING. 9

develops and retains the root system of the stock used.
Stocks, or different species of orange trees, vary greatly in
the nature of their root system.

The sour orange is particularly deep rooted. The
sweet orange is surface rooted and its feeding roots
seem to develop at the expense of the tap-root. The
pomelo furnishes a stock with some ol the advantages of
the sweet orange, but with a root system closelyresembling
that of the sour stock. The natural inference is, that for
dry localities, or where the natural water supply is deep,
the sour stock possesses advantages offered by neither
of the others. The Florida rough lemon, with its early
maturity and rank growth, furnishes a stock particularly
adapted to frostless localities.

Buddíng. This is a form of grafting in which a single
bud is inserted in the cleft bark of the tree used as a stock,
instead of a cion being inserted in the sap-wood of the tree,
as with the regular graft. The character of the orange
wood makes budding the nearly invariable practice. The
fruit of the tree thus produced is true to the type from
which the bud came. The other characteristics of the tree
foUow the nature of the stock used. Budding is best per-
formed when the sap is in fuU flow. The buds should be
entirely dormant.

Hybridizing. Several of the standard varieties of
oranges doubtless originated by the natural cross-fertiliza-
tion of quite distinct types, which have been preserved for
commercial purposes by budding. The importance and

ÍO HYBRIDIZING,

possibilities of producing new orange types by the artificial
fertilizing of che flowers of different species, resulting in
true artificial hybrid trees, oossessing some of the desirable
traits of both parents, has recently attractedgreat attentioo,
Professors Webber and Swingie of the United States Depart-
ment of Agriculcure have succeeded in crossing the svveet
orange C. trifoliata, with the inedible deciduous orange of
Japan, which is hardy as far north as Pennsylvania. The
result his already been the production of severa! edible
fruits with hardiness greatly exceeding that of any edible
orange, One of these, the Tángelo, bids fair to achieve
prominence as a substituto for lemons and limes, productive
far north of any región of orange culture.

The object in view in this line of effort, has been the
development of an orange of commercial valué, with the pro-
nounced hardiness of the deciduous parent. Results already
achieved indícate that this object is quite within the range of
possibility, and that hybridizing must hereafter be recog-
nized as an accepted method of orange propagation.

SATSUMA ORANGES FROM FLORIDA.
RESULTS FROM GOOD CULTURE AND LIBERAL FERTILlZATlON.

VARIETIES,

Types, To the novice in orange culture, or to persons
whose inierest in the fruit is confined to the specimens
found in market, and whose knowledge of distinctions
would be expressed in the terms good, better, best, it is
surprising to learn that there are about as many varieties of
the orange as there are of the apple. It is nevertheless
true, that the number of described varieties reaches scores,
and that nearly every well equipped nurseryman in orange
growing sections, regularly propágales tvvo dozen or more
diíferent varieties.

These varieties diffcr in many of the most essential char-
acteristics. Size, flavor, sweetness, beauty, number of seeds,
hardiness, productiveness, period of bearing and season of
fruiting and adaptation to localities are the cliief distinguish-
ing features.

It is impossiblehere to even ñame the diíferent accepted
varieties. There are severa! recognized types, from which
ene or more representative varieties may be selected as char-
acteristic of the numerous oranges belonging to the type.
as follows:

Seedlings: Florida, Sweet Seedling, Tahiti, Homosassa.

Modified Seedlings: Joppa, Wolfskill's Best,

Navels: Washington, Rivers'.

St. Michaels: Paper Rind, Hart's Tardif, Valentía Late.

Blood Orange: St. Michaers Blood, Maltese, Ruby.

Mandarín: Satsuma, Dancy, King.

VARIETIES.

13

Among the more valuable of the characteristics of the
different varieties, is the difference in season for ripening.
By means of this distinction, it is possible to select varie-
ties which will extend the orange season from September
to June. Any good nursery catalogue gives the date of the
ripening of standard varieties.

KUMQUATS FROM FLORIDA.

PREPARATION FOR PLANTING.

Localities differ so greatly in their relations to tree
development that the treatment of the site selected for
the grove, previous to setting the trees, must be determined
by local conditions. There are, however, certain general
principies which apply to all localities.

Thorough plowing and pulverizing of the land to be
devoted to the grove should be insisted on. Even newly
cleared hammock and the Sonth Florida rock land should
not be exempt from this injunction. The habitat of the
tree is never restricted by a small circle immediately around
the trunk. It is eventually to occupy, and feed from the
entire área. The entire soil must therefore eventually be
worked, if the best results are to be secured. This can
never be so effectually and economically accomplished as
before the trees are in place. The charactcr of the soil
must determine the depth of the breaking, but one foot is
seldom too deep,

This first working should be accomplished during the
Fall or Winter preceding the planting. Vegetation "will
thus have a chance to decompose and leave a mellow bcd
for the roots of the young trees. Where irrigation is to be
practiscd, the land should be carefuUy graded, so that all
parts may be reached by the water, and the accumulation
of pools be prevented.

Should the soil be somewhat subject to excessive moist-
ure, as is the case with some hammock and *'glade'* lands

PLANTING. 15

iii Florida, the land should be thrown into beds as wide as
the distante between the intended rows of trees, which
should then be planted in the centre of the beds. The
water-furrows will then be half way between the rows,
which should run in the direction of the natural slope or
drainage cf the land.

The land should be susceptible to the thorough cultiva-
tion of the hoed crop. AU obstacles to such treatment
should be removed. There is no more excuse for stumps
and rocks in a grove than in a garden. Not that clean cul-
ture must always be followed, but that perfect control of
conditions, and fuU protection of trees, are not possible
when cbstaeles to perfect cuitivation exist.

TRANSPLANTING.

Time. The orange being an evergreen, may be trans-
planted through a very much longer period than is the case
with deciduous trees. Indeed it may be set out at any time
without serious risk, but there are naturally certain seasons
when transplanting may be performed with best results.

Citrus trees have several periods of comparative dor-
mancy. These vary in different sections. As a rule the
time immediately preceding full activity, the natural bloom-
ing season, is best for this purpose. Late winter and very
early spring is the favorite planting time in Florida. Early
summer is the preferred time in California.

Age. This will be modified by variety and location.
The stock used also has an important bearing on the ques-
tion of age for transplanting.

Seedlings grow more slowly than budded trees, and
should have the advantage of a year at the time of setting
out. The trifoliata stocks are usually transplanted as one
year oíd buds. Other varieties should remain at least
two years in the nursery row.

Methods. The orange grower will, as a rule, find it
best to depend on the professional nurseryman for his
supply of young trees.

Most trees brousfht considerable distances will l)e re-
ceived with bare roots, the tap-root being cut about one
foot long. At least one half of the foliage should be re-

SELECTION OF SITE. 17

moved. The clipping off of a part of each leaf is preferable
to removing one half of the entire number of leaves.

Great care should be taken to prevent the roots of the
trees from being exposed to the sun for any length of time
during the transplanting process.

Holes should be dug large enough to receive the roots
without cramping. The hole should be partly fiUed with
fine earth as a bed for the roots. In this bed a hule for rc-
ceiving the tap-root should be made with shovel handle.
The tree should be set a little higher than it grcw in the
nursery, to allow of settling. The soil should be carefully
settled around the roots by hand. When the hole is ncarly
fiUed, the ground should be thoroughly soaked with water,
that the roots may immediately find moisture, the suil be
closely pressed to the roots, and all air hules fiUed. The
hole should then be filled in, a little higher than the sur-
rounding level. Sprinküng the foliage after the tree is set,
is a great advantage, as evaporation from the leaves is thus
checked and wilting and shock are proportionately reduced.
A quicker start is thus secured.

Laying ouí the grove, as well as distance of trecs apart,
must depend largely on varieties. Location and character
of soil will also have important bearing on this point.

The most frequent system of planting is in squarcs.
The quincunx system with a tree in the centcr of each
square has its adaptations. This is usually followed when
the permancnt grove consists of large and slow growing
sorts, libe the sweet seedling, theíi the center of the square

l8 SYSTEMS OF PLANTING.

may profitably be occupied by a quick growing smallcr
tree, like those of the Mandarín type, which may be re-
moved when the large trees reach full size. The hexagonal
and other systems allowing of more trees per acre, are not
generally used.

The distances at which trees should be placed, should
be greater on hammock and very productive soils, ihan oa
sandy and less fertile ones. The size of trees varíes so
much with variety, that this must rcmain the controUing
factor ín deciding the matter of distances.

For common stocks 25 to 30 feeí each way are the stand-
ard distances. TrifoUata and pomelo stocks should be set
iS to 20 feet apirt. At 20 feet each way an acre accommo-
dates 108 trees. The number required for the square system
Í3 easíly calculated for any distance. The quinen nx system
requires 15 per cent more trees than tlie square, for Úiq
same distances.

CULTIVATION,

Time. No hard and fast rule can be laid down for the
cultivation of the grove, except that experience in all coun-
tries leads to the conclusión that orange trees should be
treated as a cultivated crop, and be given careful thorough
tillage during some part of each year.

1

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SHOWING CLEAN CULTURE IN GROVE —WELL EERTILIZED.

Cultivation unquestionably sti:nulates root activity.
It has, therefore become an accepted belief, that during the
periods of dormancy of the tree, occurring in difíerent
sections at somewhat different seasons, cultivation should
cease, that the natural recuperative rest of the tree may not
be interfered with.

There is another reason why this period, existing chiefly
in the vvinter, should not be disturbed, in sectiuns subject

20 CULTIVATION.

to damage from cold. Cultivation starts root action. Root
action brings the sap into flovv. The more near perfectly
dormant the tree is, when subjected to cold, the less thc
danger of injury. During the period of liability to serious
cold, therefore, all working of the soil, with its stimulating
cffect on the roots, shouldbe wholly abandoned. It may be
accepted as a safe rule that cultivation should be confined
to the interval, betvveen February and November. During
this period, however, practice in different sections varies
greatly. In California the accepted rule is — *' the soil
must be kept mellow and free from weeds at all times." It is
another accepted practice to cultívate after each irrigation.

In Florida a quite radical diíference in practice has bc-
come general, During the heat of summer cultivation
ceascs. Por three months not only are the plow and cul-
tivator kept from the grove, but the tendency of nature to
cover thc unprotected soil from the burning heat of the sun,
by means of protecting vegetation, is encouraged.

The Florida orange grower is, year by year, going
farther in this dircction and now even sows protective fo-
rage crops, chiefly legumes, particularly desmodium and
velvet beans, as a nitrogen-conserving method for prcvent
ing the burning up of the organic matter of his soils by the
heat of mid-summcr. These crops are either harvested or
plowed under in the Autumn, thus increasing the fertility
and tree-sustaining capacity of the soil.

Clean Culture vs. Cover Crops, This comparison has
been thoroughly made in both Florida and California*

CULTIVATION. 21

The victory, and general practice is in favor of the cover

crop, on all soils free from excess of organic nitrogenous
matter and wlicre die-back has not manifested itself.

Methods. The character of the soü will necessarily
chiefly influence the nature of the cultivation followed, and
the mcans by which it is effected. On the comparatively
light soils of Florida cultivation from 4^to 6 inches deep is
the common practice. The plow is used for this purpose
usually at least once per year. The more frequent culti-
vations are accomplished by use of the orchard cultivator,
a cut-away, or the spading harrow. In dry seasons the more
frequent and shallow cultivation is practiced.

In California the subsoil plow was formerly believed
indispensable, to break up the "irrigation hard-pan " re-
siilting from constant plovving and watering to a fixed depth,
The cffects of the root destruction inevitable to the use of
the sub-soiler, became so apparent that the practice is no
longer commendcd. Plowing to the depth of one foct in
thrce furrows betvveen the rows, and plenty of water slowly
and continuously used, effectually overeóme the hard-pan,
or prevent its occurrence. Although not now needed as
much as formerly the regular and deep use of the chisel-
toothed cultivator, together with plenty of water used
slowly are equally efifective. (*)

(*) California Ex. Station Bulletin 138,

FERTILIZING.

The orange is more dependent on quality for liberal rcv
turns to the grower than is any other fruit. This is neces-
sarily so from the fact that it is almost exclusively a dessert
fruit consumed in its natural condition. It is seldom con-
verted into secondary products, is rarely cooked and there-
fore its natural properties are neither supplementcd,
changed ñor corrected by art or artífice. The orange is
also extremely susceptible to modification through the
influence of the food upon which it feeds. These facts
make the matter of fertilizing the tree one of the most im-
portant factors involvcd in orange culture.

This is true wherever the business has reached a high
State of development. Wherever an assemblage of orange
growers begins discussing any phase of the business in
which they are engaged, the problems of satisfactory fertil-
izing are sure to come to the front. The groves may slope
to tlie shores of the Mediterranean, bask in the sunshine of
the Pacific or be kissed by the breezes of the Gulf of México,
but the golden fruit they bear has resulted from the practice
of the advanced science of plant fertilizing.

lii Florida the larger proportion of the groves are
located on pine land so deficient in general fertility, that
whatever is taken from the soil in the form of crop, must
have first been artificially given to it in the form of plant

ORANGE EXPERIMENT OF MR. JOAQUÍN BERNAT,
CATARROJA, SPAIN.

TREE FEK.TÍL1ZED WITH POTASH, PlIOSPHORIC ACID AND NITROGEN.
YIELD PER ACRE, 1 706. 7 l.P.S.

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TREE FERTILIZED WITH PHOSPHORIC ACID AND NITROGEN.
NO POTASH. YIELD PER ACRE, 1330.5 LBS.

24

NEED FOR PLANT FOOD.

food. In California many groves are planted on land shown
by analysis to be strong in all the essentials of plant growth.
Yet on these lands, with regular irrigation, successful
growers "do not consider it priident to make too great de-

ÜRANGE GROVE NEAR RIVERSIDE, CAL., SHOWING LACK
OF FERTILIZATION.

ORANGE GROVE NEAR RIVERSIDE, CAL., LIBERALLY
FERTILIZED WITH COMPLETE FERTILIZER.

mands upon the soil without giving back some equivalent
in the form of plant food. " (*)

This unity of opinión and similarity of practice, in sec-
tions so far apart and different in natural conditions, is the
strongest proof of the necessity and importance of orange
grove fertilizing.

(*) •' Citrus Culture in California " p. 134.

BASIS FOR FERTILIZING. 25

The basis of practice. Whatever may be the local modi-
fications, the acceptcd basis, the accepted starting point for
the rational fertilizing of any crop, is the chemical compo-
sition of that crop.

The object of the intelligent cultivator is to apply to the
soil the plant food required by the crop to be produced
thereby, and which experience shows that the crop is unable
to secure by natural means. A knowledge of the character
and habits of growth of the crop in question, and of the
composition and propcrties of the soil, are important modi-
fying and accessory considerations.

Each of these factors must be separately considered in
reference to orange production.

Composition of Oranges. The íriiit of California and
Florida diffcrs each from the othcr so greati}" in character
and composition, that analyscs of both are here presented.

FERTILIZING CONSTITüENTS IN ÍOOO LBS.
OF ORANGES. (*)

Phosphoric Acid. Nitrogen. Potash.

California 0.53 Ibs. i 83 Ibs. 2.iilbs.

Florida 0.77 " 1.24 " 4.79* "

The comparison of these figures shows a very noteworthy
difference in the composition of the fruit of the two States,
Jt is probable that this difference in the fertilizing consti-

(*) Cal. & Fia. Sta. Bulletins, respectively Nos. SS and 17.

20 RELATION OF FLAVOR TO SOIL.

tuents of the fruit of the two sections is in keeping witb.
the well known differences in the character of the fruit
itseJf.

The most noticeable difference is in the potash content.
The Florida fruit contains more than double the amount
found in that of California. The well recognizcd influencc
of potash on sweetncss and flavor would, with thcsc analyses
in hand, seem to explain the pre-eminence of the Florida
fruit in sweetness and flavor,

Composition of Orange soil. The composition of any
soil, as determined by analysis, has little bearing on
mcthods of practical fertilizing. This must be true, from
the impossibility of dctermining the amount of any soil
constituent which may really become availablc, or possibly
used by any crop during its period of grovvth. The cliem-
ical composition of the soil is now generally bclieved to
be of less importance to the plant than the physical con-
dition of the soil and its constituents. The composition of
the soil, however, does offer some indication of its crop
adaptations and general productivness.

The futility of soil analysis as a basis for fertilizer treat-
ment is forcibly illustrated by experiments made in Cali-
fornia on soil shown by analysis to contain available potash
"sufficient for many consecutive crops, but on which the
application of potash increased the yield of fruit, improved
the growth of the trees and raised the sugar content of the
juice over 37 per cent. " (*)

(*j Prof. Woodbridg-e, Report Riverside Kort. Club., 1805.

FOOD REQUIREMENTS.

27

The Food Requirements of the orange iifíer írom
recognized requirements of other crops, only in amount
and proportions. Potash, phosphoric acid and nitrogen
are demanded by the tree, in excess of the ability of commcn

GROVE OF A. M. SEELEY. — COVINA, CAL.

SHOWING RESULTS OF COMPLETE FERTILIZER — POTASH, PHOSPHORIC

ACID AND NITROGEN.

soils to supply, and must therefore be provided by the
grower. His concern is not what but how much and in
what form to apply.

It should be here noted that lime is known to possess
special adaptations to the orange. Its action is to produce
the desirabíe thinness of skin. Since all commercial form*

zS PHOSPHORIC ACID AND NITROGEN.

of phosphate supply available lime, its artificial providing
is seldom rcquircd.

The special properties and adaptations of each of tbe
tbree plant food cssentials must be separately considered,
so tbat tbe principies controlling their successful use may
be iindcrstood.

Phosphoríc Acid. Its direct effect is exerted more on
tbetreetban on tbe fruit. The seed, bowever, makes con-
siderable demands for it. Lack of sufficient supply of tbis
material, is frequently manifested by a mottled or sligblly
variegated appearance of tbe newly formed leaf. The
disappearance of tbis condition, upon tbe liberal application
of pbospbatic fertilizers, is probably in part due to tbe well
knovvn action of pbospbates, whicb are always accompanied
by sulpbate of lime, if acidulated, in liberating otbcrwise
unavailable plant food. The demand of tbe orange for
tbis material, is really considerably less than for eitber of
tbe other two essentials. Tbere can be no doubt tbat most
complete, ready mixed fertilizers, supply mucb larger
quantities than are needed, or can be ecomonically applied,

Nitrogen. The special offices of nitrogen in orange
production, are to forcé vigorous, even rank, growtb. Tbis
is manifested in wood, leaf and fruit. The effect on foliage
is most noticeable. Absence of sufficient nitrogen mani-
fests itself in paleness or yellowness of leaf, scanty foliage
and apparentlack of vigor. Abundance of nitrogen results
in luxuriant growtb. abundant, glossy and dark colored
ieaves. Heavy juicy fruit is another result of abundant

POTASH, 29

nitrogen suppiy. Dry, light, fruit, with superabundance of
'*rag" is an indication of lack of nitrogen, Excess of
nitrogen is followed by rankness of growth, succeeded by
death of the ends of the twigs, recognized as the insipient
stage of ''die-back" which is a sure indication of mal-
nutrition. The fruit becomes thick and rough skinned.

Potash. This exerts a very apparent influence on the
general vigor of the tree, and its productiveness. Its most
decisiva influence is on the character, color, sweetness and
flavor of the fruit, and on the ripening, or hardening of the
wood. Lack of potash is manifest in the preponderance
of immature wood and the consequent susceptibility of the
tree to injury from cold.

Over one half of the total ash of the fruit consists of
potash. Scientific experiments both in California and
Florida as well as the consensus of opinión among the most
observant growers, leave no room for doubting the direct
influence of potash on the quality of fruit, especially on its
sweetness.

The influence of potash on wood development is, in
some respects apparently greater with the orange than with
other trees, and in this particular has a special significance
so far as the health of the tree is concerned.

The new growth of orange wood is normally not
cylindrical; the young twigs are at first flattened on two or
more sides to an angular form, usually approaching a
distinctly three sided or triangular condition. Toward the
end of the ñrst season this condition usually disappears^ if

30

POTASH AND TWIG GROWTH.

normal developmeiit proceeds. It is observed, however,
that in case of over ammoniatíng of the trees this angular
condition is much more persisient, and the dcvelopment of
round branches is delayed. In groves deficient in potash,
or shovving excess of ammonia fertilizing, branches two

SHÜWIiNG EFFiiCT OF POTASH ON TWIG DliVKLOFM KNT.
.Vo Potash— Flat and sharply cornered. Potash -Round and well developed.

years oíd shovving three, four or even five well defined
fl \ttened sides are much in evidence. Where this condition
exists the liberal use of mineral fertilizers, especially pot-
ash conteracts this condition.

Not only does this condition of the young growth of a
tree, therefore, give good indication of its fertilizer re-

EFFECTS OF POTASH ON GROWTH. 31

quirements, but the fact is of particular importance in its
relation to tree health. Over ammoniation is recognized
as one of the chief causes of die-back. Careful observation
shows that, even with twigs of the same age, die-back is
most prevalent where the proportion of angular twigs is
greatest. The persistent presence of this condition of tlie
young branches, after the first year, is a sign of more or less
abnormal development, due to unnatural condiiions. The
changes are among the pre-disposing causes of one of the
most persistent orange tree diseases, die-back. Potash
seems to be a corrective of these conditions, and its liberal
use lessens the probability for disease and improves the
condiiion of effected trecs.

Relation of Habits of Qrowth. With the special relations
of the different plant fuods of the orange in mind, the modi-
fying effects of the character of the tree on the practical
application of fertilizers, must be considered, before dis-
cussing the important matter of the forms of supply.

There are three facts relative to the habits of growth of
the tree, which have direct bearing on the matter of practi-
cal fertilizing

First is the fact of the great longevity of the tree itself.
This age and slow development means that any fertilizer
applied to the tree, unless interfered with by other conditions,
is subject not only to the action of the tree, but of the ele-
ments, and soil changes for a long time. The resultis that
material not used by the tree during the first season, may
become available the next, or possibly remain for years

32 FACTORS EFFECTING FERTILIZATION.

within reach, and eventually be used. The special signifi-
cance of this fact, lies in its application to the phosphoric
acid. The reverted acid is probably fully as valuable to
the orange, as the soluble form, and doubtless in time be-
comes available and is used by the tree. This accounts for
the common preference of growers for bonemeal and
similar forms of phosphates.

The next important consideration in connection with
the character of the tree or its habiis of grovvth, concerns
its root system.

Different types of oranges or different stocks, possess
root systems quite different in their relations to the matter
of the plant food supply adaptcd to their requirements.

The sour stock is much more deeply rooted than is either
of the others. Nitrification is a comparatively shallow soil
process. The shallow rooted stocks are therefore more
likely to derive fuU bcnefit from the fertilizers whose nilro-
gen must undergo the nitrification process. On the olhcr
hand, sour stocks are most likely to utilize nitrates, which
often penétrate the soil below the depth of shallow roots.

A third point worthy of consideration in this connec-
tion, is the fact that the orange grower must fcrtilize for
two distinct purposes, with quite unlike requirements. He
must feed both tree and fruit. With bearing trees bolh
these requirements must be supplicd at the same time.
With trees which should be in fruit, but are for some reason
unproductive, intelligent fertilizing is the most efficient
porre^tive. The mo5t important practica! deduction is^that

SOURCES OF PLANT FOOD. 3J

the young grove, before it comes into bearing, necds treat-
ment for trees alone and should be fertilized quite differ-
ently from the grove, possibly of the same age, which has
not yet reached the fruiting stage.

Forms to apply. With all crops in which the special
properties dependent on aroma and flavor control valué,
the form in which the plant food is supplied, is of very
great importance. This is particularly true of the orange,
the appearance, quality and flavor of which so largely
influence market returns. This importance is greatly in-
creased by the well recognized fact that the health of the
tree itself may be so effected by certain common forms of
fertilizar.

The source of the phosphoric acid supply, seems to be
immaterial so far as results are concerned. Economy of
cost of the actual plant food is the controlling factor witb
this food. The less quickly available forms, bone-meal,,
soft phosphate and Thomas slag may be used for perman-
ent tree making materials. For regular feeding and quick-^
er results acid phosphate should be the standby

The best form of Potash to supply the orange tree is the
Sulphateof Potash or Sulphate of Potash-Magnesia. The
former can be used where transportation enters largely inta
the cost of getting the Potash to the grove and can be used
on young trees to good advantage. The latter (commonly
known as low grade Sulphate or Double Manure Salt) is con-
sidered the best form for fruiting trees on account of the
magnesia which it contains, which is not found in the other

34 SOURCES OF PLANT FOOD.

forms of Potash Manures. A grove in Florida on which
no other form of Potash has been used for a period of
twelvx years, is noted for producing fruit of the finest flav-
or, beautiful color and good keeping qualities. Hardwood
ashes can also be used to good advantage occasionally, as
the alkali in the ashes will neutralize any acid that may have
accumulated in the soil, which will better enable the tree
to take up the plant food which is placed within its reach.

In selecting the form of nitrogen the greatest precaution
is needed. Stable manure should as a rule not be permitted
near orange trees. Although even cow and sheep manure
has been used in connection with a supplementary applica-
tion of potash and phosphoric acid, there is danger of a rank
^rowth, thick skinned fruit with excess of rag and inferior
flavor, with even splitting and dropping, if stable manure
is used alone. Still more to be guarded against is the
"die-back" almost sure to follow the continued use of a fer-
tilizer containing too much nitrogen. Other organic forms
of nitrogen, such as cotton-seed meal, tankage and blood,
possess much the same tendency as manure and should be
used with great caution except on the soils noticeably
deficient in organic matter, and prcferably for tree growth,
before the fruit period.

Nitrate of soda is the ideal source of nitrogen. §ulph-
ate of ammonia stands next. Between these two the cost of
actual nitrogen at the time of purchase, may safely be the
basis of selection. Mineral forms of nitrogen should be
used to the rigid exclusión of organic forms, except under
the restrictions mentioned.

INDIRECT ACTION OF MAXURES. 35

Secondary effects of fertilizers. Primarily fertilizers
are the raw material from which nature is to produce trees
and fruit. There are certain well recognized other effects
which must not be overlooked, in any full consideration of
orange fertilizers.

Certain fertilizing materials, particularly kainit and nit-
rate of soda, possess well recognized insecticidal properties,
probably of some direct valué in the orange grove.(*) The
most important secondary efíect of fertilizers is exerted on
the water content of soils. To this the increased drought-
resistant powers of soils fertilized with certain mineral
salts is due.

Nitrate of soda and kainit both materially increase cap-
illary action in soils. More water moves upward from the
lovver strata and thus comes within reach of the roots, when
the soil has been fertilized with either of these materials,
because the moving water has become a dilute solution
of these salts. This fact is not only susceptible of scien-
tific demonstration, but accords with practical experience.
Growers frequently explain their observation on this point,
by the supposition that these materials absorb atmospheric
water, and thus increase the available supply. The real ex-
planation lies in the well known power of certain salts of
potash and soda, to increase surface tensión, and conse-
quently the capillary movement of soil water.

This action is so important that it may well exert a con-

{*) Prof. H. J. Webber in "Citrus Culture in Cala." by State
Brd. of Hort. 1900.

36 EFFECT OF POTASH ON QUALITY.

trolling influence in determining tlie selection of the form
of fertilizer, whcn no counteracting objection to the use of
the material exists. Kainit is not a desirable plant food
for bearing groves ; but nitrate of soda is one of the accept-
ed forms of nitrogen. Its influence on the water content of
dry sandy soils, particularly in Florida during the often
occurring "May drought" is sometimes sufíicient to save a
crop of fruit which might otherwise be lost.

It is well here to mention the fact that organic manures
have the opposite effect, and increase the dryness of soils
during scarcity of moisture.

Relatíons to quality of fruit. The variations in qual-
ity of oranges are so great, and their valué is so influenced
thereby, that the recognized relations between fertilizer
used and fruit produced are worthy of careful consideration.

Phosphoric acid possesses slight specific influence, after
the demands of normal development have been supplied.
Organic forms of nitrogen are detrimental to general qual-
ity, result in coarse texture, thick rough skin, excess of rag
and lack of good flavor. Nitrate of soda is sometimes
claimed to increase the sourness of the fruit, but apparent
cases may usually be traced to the comparative lack of pot-
ash, resulting in a disproportionate amount of nitrogen.

Of the three essentials, potash exerts by far the greatest
influence on character of fruit. Thinner skin, larger pro-
portion of pulp and sweeter juice are the acknowledged
effects of potash. So marked is this influence that the
experienced grower in Florida where the science and art of

BLOOM, WOOD AND FRUIT FERTILIZING. 37

orange fertilizing is developed to the highest degree, will
unhestitatingly pick out the fruit resulting from sufficient
potash supply, frum that produced in the same grove with
lack of this essential.

Time and Method of application. The orange blooms
in the Spring. The flower is produced on wood matured
the previous season. It is thus apparent that the fertilizer
or food which supports the bloom and young fruit, must
have been consumad by the tree during the previous season.

Fertilizer should be applied at least twice during the
year. Bearing trees will do better with three or four appli-
cations. February, June, September and November are the
proper months and intervals. The first may be called the
bloom, the second the fruit and the last two the wood fer-
tilizing. The former two applications should therefore be
comparatively strong in nitrogen; the final fertilizing of the
season should be particularly a potash application. The
phosphoric acid may remain constant. Proportions and
quantities will be separately considered, All applications
should be apportioned to the individual trees, the party
applyingsame should walk with the right hand to the tree,
throwing the fertilizer toward the center in the same manner
that seed is sown, This will allow suíficient fertilizer to
drop at the edge of the trees for all necessary purposes and
put the bulk in the center, where the mass pf feeding roots
are located. It should be either hoed or cultivated in.

A commoñ íenciency to apply very cióse to the trunk of
the tree shou|d b|í avoidecj^ except during the firgt two or

38 FERTILIZING SUGGESTIONS.

three years. The circle of application should be gradually
widened till the tree is eventually compelled to seek its food
through all the intervening space between the rows. There
is no danger of fertilizer needed by the tree, escaping its
search. The larger the fertilized circle, tlie greater the
área from which tlie tree will draw its supply of moisture
and natural food.

Quantity and proportions. As has already been shown,

he amount, character and proportions of fertilizer which

should be given to growing trees and to bearing groves are

materially different, Each must, therefore, be considered

separately in this connection.

Six years may be accepted as the age at which the aver-
age grove may be expected to come inio profitable bearing.
Sweet seedling trees may require íour years longer for
reaching this stage. Certain varieties, particulariy the
Salsuma on trifoliata stock, are very early bearers, even
producing fruit in the nursery row. The age limit, therefore,
is only comparative and must be accepted with these mod-
ifications.

The quantities named are for each tree, since the number
of trees per acre is so variable. Two different sets of for-
mulas are suggested, one for sandy and one for heavy or
hammock soils.

GROWING TREE FERTILIZERS.

The ability of the trce to use fertilizer during the season
of its being transplanted is comparatively slight. After the
first year the basis of plant-food supply for the tree should
be about the foUowing amounts per year :

(a) Light Soils. Phosphoric acid .6 Ibs.
Nitrogen . . . .4 "
Potash 6 '*

(1)) Heavy Soils. Phosphoric acid 0.6 Ibs.
Nitrogen . , . 0.2 '*
Potash. . . .06''

These proponions of actual plant food must necessarily
be suppiied to the grove by the application of mixed fertil-
izers, or of the difíerent fertilizing chemicals required to
furnish the quantities of the tree essentiais mentioned.

The properly mixed fertilizer containing these quantities
of actual plant food would have about the percentage com-
position of, Phosphoric Acid, 6 per cent ; Nitrogen 4 per
cent and Potash 6 per cent. One half of the nitrogen is to
be omitted from the application to heavy soils.

The foUowing materials may be advantageously applied
for supplying the fertilizer requirements of 100 trees. Acid
Phosphate, 500 ibs., Nitrate of Soda, 175 Ibs., Cotton-seed
Meal, 200 Ibs., Sulphate of potash, 125 Ibs. On heavy soils
the cotton-seed meal should be omitted, and the nitrate of
soda be depended on as the entire source of nitrogen.

40 GROWING TREE FERTILIZER.

Dissolved bone-black may be substituted for the acid
phosphate, sulphate of ammonia for the nitrate of soda, and
sulphate of potash-magnesia for the muríate of potash,
when convenience or economy make these forms the pre-
ferable source of suppíy. The substitution of either of
these materials should be made on the basis of their per-
centage composition, so that the quantity used shall contain
the same quantity of actual plant food as called for in the
above formula. As all fertilizer materials are sold on their
analytical composition, the substitution is very simple. For
instance : Suppose that sulphate of ammonia happens to be
more economical or desirable, in some case, than the nitrate
of soda mentioned, so that a substitution of the former for
the latter is desired.

Thequantity of nitrate of soda called for is 175 Ibs. This
must not be replaced by an equal number of pounds of
sulphate of ammonia, which is richer in nitrogen, but by
the quantity of the latter necessary to give the same amount
of nitrogen contained in the 175 Ibs. of nitrate. The latter
contains approximately 15 per cent of nitrogen, while the
sulphate contains 20 per cent. 130 Ibs. of the sulphate of
ammonia, therefore, contains as much nitrogen, as 175 Ibs,
of nitrate of soda, and is the proper quantity to be used in
the substitution. With this principie in mind the grower
may vary the ingredients of his fertilizer mixture at will,
from the desirable materials at his command, and still
not alter the suppl^ of actual plant íood made acce^sibl^
to the tree,

FERTILTZING FOR THE TREÉ. 4!

The quantities to be applied to the trees must necessarily
depend on age, condition and previous treatment of the soil.
The first year 2 to 3 Ibs. of the mixture recommended will
meet the needs of the tree. One half of this quantity should
be applied at the time of transplanting by putting it in the
hele at lest ten days before the time the tree is put out and
thoroughly mixing it into the soil, the more thoroughly it is
mixed with the soil, the better it will be for the tree. The
other half may be put on either in June or July.

The annual application should be regularly increased as
the tree grows. The rate of increase may be approximately
one half each year, till the tree is from 4 to 6 years oíd,
when it may be expected to be far enough advanced in crop
producing to be placed in the list of bearing trees and
be treated with the bearing tree fertilizer.

As a guide to the proper individual application to trees,
the fcllowing may be accepted as good practice :

ist year, 3 los.; 2nd, 4 % Ibs.; 3rd, 6 Ibs.; 4th, 9 Ibs.;
5th, 12 Ibs.; 6th, 15 Ibs. The age at which the change from
tree to fruit fertilizer may be made cannot be foretold.
It varies greatly, even with the same varieties. The Satsuma
is a particularly early bearer, and often makes a crop the
third year. Even with such early productivity however, the
tree will remain more important than the bearing of fruit,
for a year or two longer, since tree-making is indispensable
to future fruit making.

BEARING-TREE FERTILIZERS*

With oranges, as with any plant, the composition of the
crop produced, must be the basis of rational food supply.
This material is actnally removed from the soil, therefore
the quantity of the crop, or fruit to be provided for, is the
starling point for the rational íertilizing of the grovc. The
average amounts of the three essential plant foods, shown
by analysis to be present in the fruir, becomes the practical
basis for the economical and satisfactory íertilizing of bear-
ing orange trces.

Fertilizing Ingredients in Oranges.
20,000 Ibs., 300 boxes.
Phosphoric acid 0.06 per cent 12 Ibs.
Nitrogen ... 0.14 " 28 *'

Potash .... o 25 '^ 50 "

Adopting 20,000 Ibs. of fruit, equivalentto 300 boxes, as
a convenient crop basis, the abcjve amounts of each of the
three actual plant food requiremenis would supply the de-
mands of the crop for material for its growth. It must be
remembered, however, that this materinl only representsthe
fruit, and provides no supply for the needs of the tree on
which the fruit is produced. The actual demands of the
grove on which 300 boxes of oranges were to be made, there-
fore, would be more nearly represented by combining the
plant food requirements already specified for the growing
tree with the material now shown as nccessary for produc-
ing the fruit that tree is to bear.

NITROGEN FROM THE AIR.

43

Experience, however, has shown that economical grove
fertilizing necessitates certain modifications of this the-
oretical basis. Less nitrogen and more phosphoric acid
than indicated by the mere composition of the tree and its
fruit, are found to best meet the continued wellfare of the

Hí.Wüünun.Eso

RESULTS OF EXl'ERI.MENT, BY H. E. WINDHAM, GOSPORT, N. S. W.

WITHOUT FKRTILIZER
1 20 CASES PER ACRE

COMPLETE FERTILIZER,

WITH POTASH
570 CAgES PER ACRE

FERTIDZED WITHOUT POTASH
220 CASES PER ACRE

grove. Nitrogen is partly provided through the action of
nitrifying bacteria on the nitrogen of the air, particularly
when the intervention of a leguminous cover crop is

44 PHOSPHORIC ACID.

secured. Phosphoric acid may profitably be used in some
excess of the actual demands of the crop, because itis to an
extent subject to leeching, and moreover, assists in liberating
otherwise unavailable plant food of the soil. The applica-
tion of potash in cióse conformity to the demands of the
crop, as shown by analysis is found to best meet the re-
quirements of the grove.

A fertilizer which shall supply loo trees with 72 Ibs. of
phosphoric acid, 40 Ibs. of nitrogen and 122 Ibs of actual
potash will meet the plant food requirements of theaverage
300 box grove. This, therefore may advantageously be
adopted as the basis, or normal application forthe rational
fertilizing of the bearing grove. It will be noticed that the
relation betvvcen these three different plant food consti-
tuents in the normal fertilizer is approximately as follows :
Nitrogen i ; Phosphoric acid 2 and potash 3. These pro-
portions should be approximately preserved in the compo-
sition of fertilizers on this basis. Taking nitrogen, the
smallest constituent in quantity required, represented by i,
the application of phosphoric acid should be about 2 times
as much and the potash about 3 times as much as the
amount of nitrogen applied. The percentage composition
of a mixed fertilizer containing these quantities and pro-
portions should be about as follows :

Phosphoric Acid (available) 7 per cent.
Nitrogen ... ... 3.5 "

Potash 12 "

CALCULATION OF FORMULAE 45

A mixture of fertilizing materials to give approximately
the above number of pounds of plant food could be made of

255 Ibs. Sulphate of Potash, (48^ Potash,) 122.40 Ibs.
515 Ibs. Acid Phosphate. (14^ available,) 72.10 Ibs.
267 Ibs Nitrate of Soda. (15^ nitrogen,) 40.05 Ibs.

1037 Ibs.

Worked out on the ton basis it would give the following
formula:

492 Ibs. Sulphate Potash, (48^ Potash,) 11.85 Ibs.

994 Ibs. Acid Phosphate, (14^ available,) 6.95 Ibs.

5 14 Ibs. Nitrate Soda, (15^ nitrogen,) ^.S6 Ibs.

2000 Ibs.

In calculating the above, the mínimum analysis of the
material used is taken, to be sure that the analysis does not
under-run. Nearly all materials over-run sufficienlly, how-
ever so that a fertilizer made on above formula would be
sure to analyze

12.00^ Potash.

'j.Go'/o available Phosphoric Acid,

3.90^ Nitrogen,

The same plant food essentials may be supplied
in dlfferent forms, the use of which must depend on con-
venience, economy and their adaptability to the crop to be
grown. The following materials will give a variety from
which to select :

40 CALCULATION OF FORMULAE.

Potash, 12 2 Ibs. Actual Potash Require

Sulphate Potash, 48^ 255 Ibs.

Double jManure Salt, 26fo . . . 470 "

Available Phosphoric Acid 72 Ibs. require

Acid Phosphate 14/0 515 Ibs.

Acid Phosphate 16;^ . . . . . /150 *'
Dissolved Bone Black iSfo . . . 400 *'
Acid Phosphate 8'/o 900 "

Nitrogcn, 40 Ibs. require.

Nitrate of Soda, 15;:^ Nit. . . . 267 Ibs.

Sulphate of Ammonia, 20;^ Nit. . 2co "

Dried Blood, 16^ Nit 250 "

These materials may be applied singly or mixed as
complete fertilizers, tlie different ingredients to be varied
accordingto the conditions of the market and convenience
of the grower. Since only mineral materials more or less
absorbent of moisture, are includcd, they should not be
mixed cxcept for use in the near future. Thcy will cake
and become hard or nubby, if allowed to remain several
months before use.

The proportions mentioned are intended to remain
fixed. The total quantities to be applied, however, must
vary with the age requirements of the trees and condition
of the grove as well as general fertility of the soil. These
quantities are suggestcd as a basis, and may be accepted as
meeting the average requirements of the 300 box grove.

THE DEMANDS OF THE TREE. 47

A grove, producing 300 boxes is, however, only at the begin-
ning of its period of bearing. The quantity of fertilizer to
be applied must be increased with the increasing growth
and increased demands of the tree. The total application
recommended for 100 trees and 300 boxes of fruit, was 1037
Ibs. of the above mentioncd mixture. Thisrate of 10.37 ^bs.
per trce should be increased in proportion to the increased
yield of fruit. Trees yielding 10 boxes each should receive
this fertilizer at the rate of 35 to 45 Ibs. per tree. After
the ten box stage is reached, the proporlional increase in
the fertilizer mny be somewhat diminished, because at tliis
stage of production the growth of the tree itself does not
increase in proportion to the increase of fruit, and there-
after makes less demand on the fertilizer.

In mñxing orusing of the different materials recommen-
ded, the actual percentage of ihe different essentials,
potash, phosphoric acid and nitrogen in the mixture must
necessarily vary, thougli the actual amount of each of
them may remain the same. This matter is often the
source of misundcrstanding. It therefore deserves special
consideration.

The percentage composition of any fertilizer must
necessarily vary with the raw materials composing same,
since the per cent does not refer to the actual quantity of
plant food present, but is simply an expression of the fact
that the amount of the specified article of the combination
is so many per cents or hundredths of the whole mixture.

By a comparison of the tvvo different fertilizers con-

48 PERCENTAGE AND COMPOSITION.

taining the same quantities of each of the three essentials,
but made up of diíferent raw materials, giving different
percentages, this fact becomes clear.

The per cent must depend on the total quantity of which
it is a part. A half or tenth or hundredth, of per cent, of
1000 Ibs. is quite different from the same proportion of 1500
Ibs. Ten per cent of a fertilizer mixture consisling of a
total of looo Ibs, must be quite different from ten per cent
of a different mixture amounting to 1500 Ibs. though each
may contain the same total amount of each kind of plant
food present.

COMPARISON OF PERCENTAGE AND COMPOSITION

Pounds of

Amount of

Per cent of

Material

Plant Food.

Plant Food.

Sulphate Potash, 48^

255

122.40

11.85

Acid Phosphale, 14^

5^5

72.16

6-95

Nitrate Soda, 15^

2Ó7

40.05

3.86

Total,

10.^7.

Sulphate Ammonia, 200

Acid Phosphate, Sfo 900

Double Manure Salt, 26^ 470

40.00

2.55

72.00

458

122.22

7-77

Total, 1570.

This comparison makes very evident the niistake of
estimating the plant food contení of mixed fertilizers by

"make weights." 49

their percentage composition. Instead of stipulating the
per cent of each essential required in a mixture, the actual
amount of each of the three plant foods desired should be
specified.

Another erroneous supposition of many users of fer-
tilizers should be mentioned in this connection. Many well
meaning advisers of growers, ignorant of all details of the
actual business of making and selling fertilizers, constantly
speak of "make weights" and "fillers" in connection with
commercial fertilizers. These allusions have led to the
common belief among uninformed persons, that mixed fer-
tilizers often contain materials put in for the solé purpose
of bringing the total quantity of material in mixture up to
2000 Ibs. as the ton is the unit of commercial transactions,
and that in order to buy a small amount of plant food,
they are obliged to pay not only for the so called filler, but
high freight rates on a material which is useless. As a
matter of fact there is little actual filler in fertilizers, (es-
pecially those of high grade) as the reputable manufacturer
prefers to have an overrun rather than resort to the use of
"make weights." However when a specified percentage is
insisted on (and at same time, the kind or source of the
materials to be used is specified) it would be necessary for
the manufacturer to use filler, providing the original
material is concentrated and, the consumer insists
on buying the goods by the ton.

As a rule however, since the manufacturer decides on
the percentage composition of the fertilizer and has at hi§

50 FILLER — NOT A PLANT FOOD.

disposal for compounding the same, desirable raw material
varying greatly ia strcngth or concentration and can
combine them to secure the desired percentage of each
essential in each ton of mixture, he is able to make mosí
any desired mixture without the use of "filler."

AU fcrtilizers coníain actual plant food having a definite
commercial valué, combincd chemically with material which
has little or no commercial valué as plant fuod. This latter
material is in no sense "filler" but is just as necessary as the
plant food itself, being in mosteases essential in conserving
the actual plant food until the plant or fruit can make use
of it. Filler or "make weights" contain no plant foud.

With thcse facts before him the orange grower is in
possession of the Information which should enable him to
economically supply his grove with the materials essential
lo its continued productiveness.

It must not be inferred that these fertilizer suggestions
meet cvery case and condition, They are simply the bas'S
for intelligent action. The formulas givcn will maintain
the productiveness of the average grove under normal con-
ditions. It does not follow, however, that the same end may
not occasionally be advantageously attained by other means.
When the grower is so skilled as to unerringly diagnose the
indications of his grove, and thereby interpret its food re-
quirements, he may vary, or even omit, one of the ingre-
dients mentioned, or obtain the same by other means, Until
he is thus skilled, however, he will usually do well to follow
the route marked out by succecsful predecessors.

SINGLE BRANCH OF GRAPE FRUIT.
FRÜM TREE FERTILTZED WlTH COMPLETE FERTILIZER.

IRRIGATION*

The necessity, or desirability, for artificial water supply
for the grove, must depend entirely on locality. In Cali-
fornia it is absolutely indispensable, wherever orange grow-
ing is a commercial industry. In Florida it is frequently
provided as protection againstdamage from drought, which
often occurs soon after the young fruit has set, and oc-=
casionally results in serious dropping.

Methods in the two states are wholly unlike, as conditions
are unlike and direct objects are different, In California
ditch irrigation is the solé form practiced. In Florida the
general level of the country, and very porous nature of the
soil, render ditches useless. Piping the grovesand the over-
head spraying of the trees, in the guise of artificial rain is,
usually resorted to where the natural supply of water is
augmented. Artesian and pumped surface water are both
utilized. The month of May is about the only time when
an artificial water supply is evcr found desirable. Only a
very small proportion of the groves are provided with
f icilities for irrigation.

California has generally adopted the furrow system.
About four furrows are run between the rows of trees; down
these the water is allowed to flow slowly. Care is exercised
that the water does not come in direct contact with the
trunks of the trees. Scalding and " foot rot " would be npt
tofollow. Cultivation must be thorough íind follow the
water as soon as the surface is dry enough to work,

IRRIGATION HARD-PAN. 53

The so-called 'irrigation hard-pan '' formerly so serious
a detriment to California groves, and for which sub-soiling
was believed to be the only remedy, is now effectively
overeóme or prevented. The immediate result of sub-
soiling, was serious damage from the destruction of feeder
roots. The present practice is to run three furrows a foot
deep between the rows. Water is allowed to run slowly
through these for several days, till the sub-soil is wet and
softened. The surface still remains so dry that it may be
worked. The furrows are cultivated full of dry soil.
Evaporation is prevented and water conserved. The deep
irrigation over-comes the hard-pan, which results from
frequent and constant shallow watering and cultivation to
a single depth.

WIND PROTEGTION,

Orange trces exposed to continuous high winds, es-
pecially sea breezes, as is the case in southern California
and on the east coast of Florida, are greatly benefited by
intervening wind-breaks. These are best provided by
plantations of rapid growing heavy foliaged trees. In
California the eucalyptus and cyprcss are most satisfactory.
In Florida the camphor and bamboo are successfully used
for the same purpose. Since most Florida groves are set
out on timbered lands, a belt of natural íimber, about fifty
feet wide, is the more common wind-break.

FROST PROTECTION.

It must be remembered that the orange is distinctly sub-
tropical in nature. Though it possesses considerable forced
hardiness against cold, frost is entirely íoreign to its nature
and its culture in both California and Florida has become
extended far toward the line of serious menace. In both
States protection against occasional disastrous cold, has be-
come a regular practice with prudent growers.

Conditions in the tvvo sections do not differ materially
in the amount or frequency of the protection needed. Both
possess large áreas where damaging cold is entirely un-
known. Each has many orange groves in sections where
preparation for protection is regarded as an advisable form

FREEZE OF 1895.

55

of grove insurance. In both cases protection of early
bloom, against the possibility of damage from late frosts is
the most common expedient.

The whole world is aware of the great devastation
wrought in Florida by the freeze of February 1895 whereby
property of the valué of $27,000,000 disappeared in a single
night. So many people are ignorant of the real condiiions,

VIEWING THE DEVASTATION OF THE FRKEZE OF 1S95.

and consequently misinterpret resulls, that a brief pre-
sentation of the actual facts is deemed advisable.

The freeze which destroyed so large a part of the groves
of Florida was without precedent. It was as much out of
the range of human cxpectation, as was the destruction of
Martinique by the eruption of Mt. Pelee. The climate
of Florida has not changed. The lowest temperature ever

¿6 FREEZE OF 1895.

iccorded in the State, was as long ago as 1835. The temp-
cratare was within one degree of being as low in 1886 as at
the time of the disaster of 1895. Yet the former resulted in
little serious damage to groves, while the latter annihilated
them. The reason for the difference was the unpreccden-
ted conjunction of circumstances acting together.

On December 29th, 1894, the thermometer at Jackson-

"^T" 1

AFTER THE FREEZE OF 1895. — TREES TRIMMED BACK TO TRUNKS.

ville, on the very northern edge of the orange section, fell
to 14 degrees, the lowest point reached in 6o years. Trees,
however, escapad serious harm, but they were naturally
entirely defoliated. The severe cold was followed in a few
days by three weeks of continued extremely warm weather.
The defoliated trees began to grow, nature rushed to repair
the damage. By the end of the first week in February they

DORMANCY. 57

were covered with tender buds, fresh shoots and half
formed leaves. Then on February 8th carne another ex-
tremely cold snap ; the thermometer again dropped to 14
degrees, and the trees, full of sap, were killed to the ground.
It is easily seen that it was not unusual cold, but phe-
nominal conjunction of circumstances, which brought dis-
aster to Florida.

Protection against cold, naturally assumes two distinct
phases. Namely influencing the resistance of the tree itself
and actual protection against external conditions.

Dormancy. AU horticulturists recognize the importance
of this condition of the tree, as bearing on its susceptibility
to cold. On this point Dr. H. E. Stockbridge, in perhaps
the most complete presentation of the subject published,
says : (*) " The tree must be kept as nearly dormant as
possible, from the first of December till the first of March.
AU means conducive toward this end are positively our best
and most effective protection against the possibilities of
damage from frost. " He recommends the following means
toward this end :

1. Omit the working of all groves from September
till February.

2. Exelude all nitrogenous or ammoniated fertilizers
during this period.

3. Root-pruning, carefully practiced around one-quarter
of the tree is conducive to dormancy.

(*) Report Florida State Horticultura! Society 1S99.

58 ACTUAL PROTECTION.

4. Varieties, particularly of stocks, should be selected
with special reference to dormancy, or late spring starting,
in which particular they vary greatly. The hardiness oí
varieties is chiefly a question of dormancy.

Water and forest protection. Living trees and large
bodies of water are invariably several degrees warmer than
the surrounding air. They must therefore exert some
warming influence on the atmosphere. If the prevailing
wind is from the forest or water, toward the grove this effect
may be sufficient to prevent frost, or to mitígate damage.
Growing vegetation, hedges and fences, intcrvening between
the water or forest and the grove, interfere with the free
movement of the air, and are consequently harmful. This
is particularly true of the growth often left bordering bodies
of water, which prevents the warm air moving over them.

Artificia! Shelter. Very many forms have been ex-
tensively tried in bolh California and Florida, Tents of
various designs, with and without hcat, are now practically
discarded. In California artificial hcat is ncw depended
upon and in Florida only one general form of shelter
remains in real use. This is the slatted shcd, built per-
manently over the grove. It gives about three quarters
closed and one quarter open space. Woven lath and wire
fencing material is the form of construction used. Wooden
posts and frames, are strung with galvanized iron wire for
sustaining the cover. The posts are usually left 12 to 16
feet out of the ground. The cost of such sheds is about
$400.00 to $500.00 per acre. They are of course adapted

ARTIFICIAL HEAT. 59

only to médium sized trees. They furnish protection to the
extent of from 4 to 6 degrees, when closed on the windward
side, They have some valué in shading the grove during
the summer, and thus preventing loss of nitrogen and
moisture from the soil. On the other hand, they harbor
insects and other tree pests. Their general use is not
probable.

The Use of Heat. Dry heat and moist heat are both
extensively used both in California and in Florida. Each
has a different dh-ect object. The former is resorted to
for materially raising the temperature of the atmosphere in
the grove. The latter is simply a means for preventing the
loss of the natural heat of the tree and soil, by evaporation.
Its effect is neccssarily comparatively slight, a change of
from 2 to 4 degrees, and consequent prevention of frost
formation only is expected, and is readily attained.

Slov/ fires or smudges, in California of wet straw, and
in Florida of Spanish moss, are the practical methods em-
ployed. The smoke produced, settles over the grove, pre-
vents the heat from radiating, and also after the sun rises
protects the trees from its heat. This is a most important
fact, since it is really the thawing, rather than the freezing;
which is the immediate cause of the damage.

Dry heat, or actual fires in groves, are common in both
California and Florida. Both use the coal basket of
vv^oven wire. Twenty or fifty biskets per acre afford the
protection sought. A rise of three to íive degrees
with the smaller number of baskets, w^hen outside tempera-

6o COST OF "INSURANCE".

ture fell to 24 degrees is entirely feasible. (*) These baskets
cost only about 25 cents each, and only one quarter to one
h'dlf ton of soft coal per acre per night is required for their
use. Considering the valué of the property protected, this
is as low a premium for insurance against damage from cold,
as is usually paid for protection against fire. Two or three
nights during a season will usually cover the period of
danger.

In Florida, where groves are often situated in the im-
mediate vicinity of abundant supplies of seasoned pine
wood, open fires of this fuel are resorted to instead of the
coal basket. The heat produced is greater, and the actual
protection is proportionately increased.

(*) Report Riverside Hort. Club, Citrus in Cala. 1900 p. 155,

fi^r

' Sp£ ^1£'j1i

iiaí^i!

EFFECTS OF IMPROPER FERTILIZATION RESULTING IN "DIE BACK."

DISEASES AND PESTS.

Though the orange is subject to a few serious pests, the
number is not greater tiíaii with other standard fruits.
These troubles are mostly well understood, and form the
subject of sepárate specific works, particularly the BuUetins
of the California and Florida Experiment Stations, to
which the grower is referred for full discussion. Only a
brief summary of the most important pests can be pre-
sented here.

Die=Back. This is the dying back of apparently healthy
twigs and branchcs, iisually preceded by a rusty deposit
on the bark, from which the ñame "redrust" is often
given to the trouble. This is recognized as a condition
of the tree, and not as a distinct disease. Cause. Error
in nutrition, hard-pan, lack of proper drainage, and
excessive feeding with manure and other organic fertilizers.
Treatmení. Remove the canse. Spraying with Bordeaux
mixture results in a tonic action on the leaves, greatly im-
proving the condition.

Foot-rot, Gum disease. This is believed to be due to
a vegetable parasite. Its presence is recognized by an
exudation of gum from the bark, usually near the ground.
Cause. It is believed to be conveyed by spores or germs
in the air. Cow-penning, lack of drainage, excessive
use of organic manures, and accidental injury to the
bark are believed to be the pre-disposing conditions.
Treatment. Cut away all diseased parts down to healthy

SCAB-MOLD-SCALE. 63

wood. Paint thc exposcd tissue with crude carbolic acid
Burn all removed material. All tools used should Le
disinfected with the carbolic acid wash before being used
on healthy trees. The sour stock is less subject to attack
than is other citrus wood.

5cab. This consists of warty cork-like elevations on
twigs, leaves or fruit. Cause. It is thought to be the result
of the action of a specific f ungus. Treatment. Spray with
Bordeaux mixture, or with ammoniacal copper carbonate
solution.

Sooty Mold. This is a sooty black accumulation on
leaf and fruit. Cause. It is due to the action of various
insects which exude "honey dew. " The white fly is the
most serious of these pests. Treatment. Destroy the
white fly by fumigating with hydro-cyanic acid gas. Spray
with resin wash or kerosene emulsión.

Orange Scale. This is the scale insect most common
ío citrus trees. It may accumulate to such an extent as to
cause the death of branches, or even trees, through the
loss of sap sucked out by the insects. Treatment. Spray
with solution of whale-oil soap.

PRUNING.

Within a few years a radical change in the general
praclice of pruning has taken place. Formerly trees were
made to branch high, with olean tall trunks. The heads
were thinned out to admit access of sunlight. Now low
dense heads are the decided preference.

Advantage of Low Heads. The shading of the ground
around the tree, thus preventing the soil moisture from
evaporating ; prcvention of sun baking of the soil ; ability
to support heavier crops without propping ; and greater
accessibility of fruit, resulting in easier picking, are the
chief gains from low-headed trees. Protection of the trunk
from damage from sun-scald, is also secured. Thinning
out of what was formerly considered as superfluous growth
is now practically abandoned for the same reason. Pro-
tection of young fruit from hot winds is a further gain.

Branches andsprouts which seriously mar the symmetry
of the tree, may be removed, but the pruning knife is be-
coming less and less in evidcnce in the bcst managed
groves. All necessary pruning should of course be done
while the trees are dormant. Wounds should be painted or
otherwise protected from the air.

HARVESTING AND PACKING.

However successful the grower may be in producing
fruit, the real success of his business will finally depend on
the skill used in harvesting and marketing his crop. A few
of the salient points influencing results will be presented.

Picking. Clip, never pulí the fruit. The stem should
be cut cióse up to the orange that danger of puncturing
neighboring oranges may be avoided. Pick into hand or
shoulder baskets and at every stage handle each orange
with care. Only fully ripe fruit should be picked. Unlike
many other fruits the ripening of oranges never continúes
after they are removed from the tree.

Grading. Two distinct classes are recognized, and
should be strictly adhered to, namely, " Brights " and
*' Russets. " The latter is a distinctly Florida product. At
least two grades of each class should be made. The standard
grades of California are : Fancy, Choice and Standard.
Oranges should cure in the packing house from two to
seven days before being packed, to allow toughening of the
skin. Wrap in a good quality of tissue paper, preferabiy
with design or trade-mark stamped thereon.

Only oranges of a single size may be packed in a box
together. They should be accurately sized by machine.
The standard sizes, which refer to the number which a box
will contain, are as foUows : 96 - 1 12 - 126 - 150 - 176 - 200 -
216-250-300. The standard box only should be used

66 SIZE OF BOX.

Its dimensions are: ii/^¿ xii3^X26 inches, inside measure.
Boxes should be filled solid with fruit in rows with broken
spaces, and project from % to % oi an inch above the
cdges, so that the top may exert pressure and keep the
fruit in place.

The outside of the box should always be correctly sten-
cilled with grade, size, variety and address of grower. In
this way it is possible to establish a reputation and demand
which will have a distinct money valué to the produccr of
good fruit.

TABLE OF CONTENTS,

PACE

Introduction 3

Adaptations 5

Climate 5

Soil 6

Propagation , 1

Seedlings 7

Stocks 8

Budding 9

Hybridizing 9

Varieties 12

Types 12

Preparation for Planting i4

Localities 14

Transplanting ló

Time 16

Age 16

Methods = 16

Laying out 17

Cultivation i9

Time. 19

Clean Culture vs. Cover Crops 20

Methods 21

Fertiüzing 22

Basis of Practice 25

Composition of Oranges • 25

Composition of Soils 26

Food Requirements 27

Phosphoric Acid 28

Nitrogen 28

TABLE OF CONTENTS— Continued.

PAGE

Potash , 29

Habits of Growth 31

Forms to Apply 33

Secondary Effects 35

Rélations to Quality 36

Time and Method of Application 37

Quality and Proportions 38

Growing-Tree Fertilizers 39

Bearing=Tree Fertilizers 42

Percentage and Composition 48

Irrigation 52

Mcthods 52

Wind Protection 54

Frost Protection 54

Dormancy 57

Water and Forest Protection 58

Artificial Shelter 58

Use of Heat 59

Diseases and Pests 62

Die-Back 62

Foot-Rot-Gum Disease 62

Scab 63

Sooty Mold 6^

Scale 63

Pruning 64

Low Heads 64

Harvesting and Packing 65

Picking 65

Grading 65

POTASH

r

POTASH PAYS

Practical suggestions to farmers showing
how to use fertilizers with profit

T^ublished hy
GERMÁN KALI WORKS

(incorporated)

93 Nassau Street
New York

¿7V:0 TICE

Every farmer can obtain, fire of charge, a copy of the
followmg agricultitral books:

POTASH IN AGRI CULTURE

FARMERS' GUIDE

COTTON CULTURE (Revised)
TOBACCO CULTURE
TROPICAL PLANTING

STASSFURT INDUSTRY
SUGAR CAÑE CULTURE

THE COW PEA

PLANT FOOD

TRUCK FARMING
WHY THE FISH FAILED
FARMERS' NOTE BOOK

STRAWBERRY CULTURE

ORANGE CULTURE
VALUÉ OF SWAMP LANDS

SUGAR BEET CULTURE

State which of the above iiientio7ied publicatioiis you desire,
and it will be mailed to yoíi free of charge.

A D D R E S S:
Germán Kali Works, 93 Nassau Street, New York

BALTIMORE, MD. CHICAGO, ILL.

Continental Bldg. Monadnock Block.

POTAS H PAYS

M

MERICAN farmers and fruit growers are ríghtly
regarded as the most intelligent, enterprising, and
prosperous of their class. Our farmers make a suc-
cess of their business, because they are up-to-date and ever
ready and quick to adopt tlie latest improvements and the
newest methods. They take advantage of the teachings
of Science, and make practical use of recent discoveries,
whereby they increase the fertility of their lands and gather
large and profitable crops.

It is no wonder, then, that our farmers in California and
other States now pay so much attention to theimportant sub-
ject of supplying plant food to their different lands. They
not only know^ but they have found out that it is necessary
to put back into the soil those substances which have been
taken out year after year by their crops. Science has shown
that potash, phosphoric acid and nitrogen are continually
usedup from the soil by growing crops. Unless these sub-
stances are returned in the form of fertilizers, the farmer's
lands will surely and steadily lose their productiveness,
and sooner or later his yields of grains, or fruits, or vege-
tables, as the case may be, will become less and less.

No matter how rich the soil may be, the result is the
same, when crop after crop is gathered from the same land.
And so when a farmer is asked: '* Why do you fertilize your
land?" He at once replies "To feed my crops." Fertilizers

4 POTASH PAYS

are crop foods. It is simply a question of feeding the crops,
as it is i 11 feeding live stock on the farm. Just as different
animáis require diíferent kinds and amounts of food, so the
different soils and crops need certain substances, which are
contained in a proper fertilizer, for their best developnient
or condition.

Some farmers and fruit growers in California and other
States may cling to the oíd notion that, as the soil is still
new, it does not need potash and the other elements which
have been removed by the successive crops. But this is a
mistake. If they did not need potash, California farmers
would not buy the large quaiitities which they do at the
present time. Those who are using potash on their farms
and orchards in California are getting a good profit on their
investment. Their opinión that "potash pays" is the best
testimony to its valué. Such an opinión is based upon
practical experience and upon the actual results from the
increased crops which they obtain from the proper use of
potash with the other necessary ingredients.

While certain tests with certain soils in California have
shown that they contained considerable potash, yet the
important question is: ''How much of this potash is avail-
able as plant food?" Or, the question may be asked: **Is
this potash naturally in the soil in a soluble condition?"
If the potash is in an insoluble condition it is useless to
plant growth, and potash fertilizers must be used in order
to obtain proper yields. The mere statement that a chemical
analysis shows considerable potash in a soil is not sufíicient,
for by present chemical methods it is impossible to determine
the quantity of plant food which is available to the diíferent
plants growing on the soil.

How many of our readers ever carefully considered the
large quantities of potash, phosphoric acid, and nitrogen

POTASH PAYS 6

which are lost, so to speak, each year? Vio you know the
number of pounds of valuable potash taken per acre by
any of the leading crops? If not, you should read and
study this list r

Table Showing the Amount of Potash Removed by Crops

and Ouantity of Potash Salts Needed to

Return Fertility to the Soil

Crop

Yield

Actual Potash
Removed

Muríate or Sulfate

of Potash Needed to

Return Fertility

Apples

15 tons

60 Ibs.

120 Ibs.

Barley

*30 bu.

51 Ibs.

102 Ibs.

Beans

*30 bu.

53 Ibs.

106 Ibs.

Buckwheat

*34 bu.

40 Ibs.

80 Ibs.

Cabbage

30 tons

270. Ibs.

540 Ibs.

Cío ver (dry)

2 tons

88 Ibs.

176 Ibs.

Corn

*70 bu.

55 Ibs.

110 Ibs.

Grapes

*2 tons

39 Ibs. .

78 Ibs.

Hops

*600 Ibs.

53 Ibs.

106 Ibs.

Mixed Hay

2)4, tons

77 Ibs.

154 Ibs.

Oats

*60 bu.

62 Ibs.

124 Ibs.

Onions

22K tons

72 Ibs.

144 Ibs.

Pears

16 tons

26 Ibs.

52 Ibs.

Peas

*30 bu.

52 Ibs.

104 Ibs.

Plums

8 tons

40 Ibs.

80 Ibs.

Potatoes

*200 bu.

74 Ibs.

148 Ibs.

Rye

*30 bu.

45 Ibs.

90 Ibs.

Sugar Beets

*15 tons

143 Ibs.

286 Ibs.

Timothy Hay

2 tons

94 Ibs.

188 Ibs.

Tomatoes

10 tons

54 Ibs.

108 Ibs.

Wheat

*35 tons

31 Ibs.

62 Ibs.

* Note: Includes straw.stover, vines, pods, etc. in addition.

6 POTASH PAYS

All of the foregoing crops also remove from the soil the
otlier two essential elements of plant food, which are phos-
phoric acid and nitrogen. Of course it is quite necessary
that all three of these plant foods be present in the soil in
order that the growing crops get suitable food or nourish-
ment. Potash, phosphoric acid, and nitrogen each have
their own valué and do their sepárate work; so that one
can not take the place of the other. A proper mixture of
these three ingredients makes what is known as a ' 'complete
fertilizer." The average farmer can usually make his own
mixtures. In fact, many farmers preíer to buy their potash
and other plant foods and mix them to suit their soil and
their different crops. The amounts of potash, phosphoric
acid, and nitrogen depend on the nature and condition of
the soil, as well as on the kind of crop to be grown.

Anotherimportant point to remember is, that the quanti-
ties of plant food which each crop actually requires can not
be measured by the exact number oí pounds of potash and
the other plants foods removed by that crop from the soil.
The reason is that plant roots can only reach a certain
amount of plant food in the soil, while the rest is not taken
up. Therefore, practical tests and experience have shown
that larger quantities of potash, phosphoric acid, and
nitrogen must be supplied than the actual number of
pounds per acre removed by the yield.

The practical farmer and fruit grower will ask: *"How
can I find out just what kind and how much fertilizing
material I should use for such— and — such a crop?"

In reply, we would suggest that the farmer or fruit
grower make a few simple tests of fertilizers for himself,
and this each one can do at a very small amount of trouble
and expense.

The best way is to lay out "experimental plots." You

POTASH PAYS n

should take small plots of ground of the same size and
give each one the same kind of treatment, except as to
its fertilization. Three such plots may be laid out as
f oUows :

Plot No. 1

Check Plot No Fertilizer Applied

Plot No. 2

Use a complete Fertilizer, containing Potash, Phosphoric Acid
and Nitrogen

Plot No. 3

Appl\; an ' ' Incomplete Fertilizer, ' ' containing onl^
Phosphoric Acid and Nitrogen

Now compare the results. The diíference in yields on
Plots Nos. 1 and 2 will show the gaiii from using a complete
fertilizer on the land.

The difference in the yields on Plots 2 and 3 will show
the loss from not having Potash in the fertilizer. . ^

Just such experiments have been made by a number of
practical farmers in California. They cover a wide range
ofsoilsin that State and many different crops. The in-
teresting results thus obtained are set forth in the following
pages.

POTASH PAYS

EXPERIMENT ON PEACHES

This experiment, made by Mr. H. E. Butler, for the
Penryn Fruit Company, clearly demonstrates the valué of
fértil izers for the orchard. Moreover, it clearly shows the
valué of Potash in producing large yields of superior fruit.

The Lovell peach was the subject of the test and the
soil over the acre used for the experiment was a clay loam
with a decomposed granite subsoil. The trees w^ere six
years oíd at the time the experiment was started in 1906.
There was a crop failure during that year but quite satis-
factory crops were harvested in 1907 and 1908, as shown
in the following table:

Plot

Fertilizer applied per acre
in pounds

Yields per acre
in pounds

Increase over
unfertilized plot

No fertilizer

120 Muriate Potash
600 Superphosphate
180 Nitrate Soda

600 Superphosphate
180 Nitrate Soda

1907

1908

7500

20000
12500

1907

6150
2460

1908

1

2
3

6150
12300

8610

12500
5000

In 1907 increase from 120 pounds of Muriate of Potash
per acre, was 3690 pounds Peaches. In 1908 increase from
120 pounds of Muriate of Potash per acre, was 7500 pounds
Peaches. Average increase from 120 pounds of Muriate
of Potash per acre, was 5595 pounds Peaches.

Comparatíve Yields, 1908. Experiment by H. E. Butler, Penryn, Cal.

.*»'» ♦^^%.

Incomplete Fertilizer ( NO POTASH ) Yield, 6M tons per acre

Complete Fertilizer (WITH POTASH) Yield, 10 tons per acre

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POTASH PAYS

11

EXPERIMENT ON BARTLETT PEARS

This experiment, by Mr. C. E. Hustler, Cortland, Cal.,
was conducted on sandy loam, soil in an orchard 25 years
oíd and on trees in good bearing condition. Although there
was trouble from blight in some parts of the orchard, this
did not affect the results of the experiment.

The following is an account of the amount of fertilizer
applied, the yields, and the increase due to the use of
fertilizers:

Plot

Fertilizer per acre in pounds

Yield per acre
in pounds

Increase per acre

over unfertilized

in pounds

No fertilizer

180 Sulfate of Potash
600 Acid Phosphate
180 Dried Blood

600 Acid Phosphate
180 Dried Blood

56160
70720

62400

14560

6240

Increase from the use of the complete fertilizer was 280
"picking" boxea averaging 52 pounds each. The increase
from the use of 180 pounds of Sulfate of Potash was 160
•'picking" boxes.

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POTASH PAYS

X6

EXPERIMENTS ON RAISIN GRAPES

The experiment illustrated on the preceding page,
conducted by Mr. A. J. Bump, Orosi, Cal., was made in a
ten year oíd vineyard of Muscat Grapes.

Owing to depletion of soil íertility the yields were not
very satisfactory, but through the use oí fertilizers contain-
ing potash a marked increase has been obtained as shown
by the folio wing results below:

Plot

Amount of fertilizer material Yield per acre
applied per acre in pounds in pounds

Increase over

unfertilized plot

in pounds

1 1908

1909

2028

2522

2132

1908

1909

1

2
3

No fertilizer

120 Muríate Potash
600 Superphosphate
180 Nitrate Soda

600 Superphosphate
180 Nitrate Soda

1854
2624

2088

770
234

494
104

The test ou grapes described on the following page
was made in the vineyard of F. C. Lewis, Fowler, Cal.
•'Thompson's Seedless" was selected for this experiment,
and the results, reported for two years show that potash
was essential to the largest yields, a good profit being
obtained from its use.

Plot

Amount of fertilizer material
applied per acre in pounds

Yield per acre
in pounds

Increase over

unfertilized plot

in pounds

No fertihzer

120 Muríate Potash
600 Superphosphate
180 Nitrate Soda

600 Superphosphate
180 Nitrate Soda

1908

1909

3746
4950

4550

1908

1909

1

2
3

2391
5211

4640

2820
2249

1204
804

Experiment on Seedless Raisin Grapes, by F. C. Lewis, Fowler, Cal.

Plot No. 2 Fertilized with High Grade POTASH Fertilizer

Plot No. 3 Grapes F^rtiliz^d without POTA5H

POTASH PAYS

Í5

EXPERIMENT ON ORANGES

The results of the following experiments made at four
different farms, near Porterville and Riverside, should be
carefully studied by the practical grower. These triáis
show large increases produced by tising potash fertilizers in
conjunction with nitrogen and phosphoric acid.

Experiment by W. H. Grant, Porterville, Cal., Oranges
on black adobe over clav subsoil.

Plot

Fertilizer applied per acre
in pounds

Yield per acre
in pounds

Increeise over

unf ertilized plot

in pounds

No fertilizer

120 Sulfate Potash
600 Superphosphate
180 Nitrate Soda

600 Superphosphate
100 Nitrate Soda

1908

1909

11660

23328
17280

1908

1909

1

2
3

12285
17940

15765

5655
3480

11668
5620

Average increase from about $3.50 spent for Potash
4,112 pounds Oranges. See photo page 17.

• 9 •

Experiment by H. C. Carr, Porterville, Cal., Navel
Oranges, on deep loam soil (clay subsoil).

Plot

Fertilizer applied per acre
in pounds

Yield per acre
Picking boxes

Increase per acre

over
unf ertilized plot

1

2
3

1-

No fertilizer

600 Superphosphate
180 Sulfate Potash
150 Dried Blood

600 Superphosphate
150 Dried Blood

648
864

756

216
108

The increase from about $5.00 worth of Potash, was
108 boxes. See photo page 18,

16

POTASH PAYS

Experiment by O. K. Kelsey, Riverside, Cal., on sandy
loam soil.

Plot

Fertilizer applied per acre
in pounds

Yield per acre
in packed boxes

increase per acre due
to potash

2
3

320 Sulfate Potash
1440 Superphosphate
640 Nitrate Soda

1440 Superphosphate
640 Nitrate Soda

391
330

61

Notwitlistanding tlie heavy application, Potash gave a
good profit, 61 boxes of Oranges from about $9.00 worth
of Potash. See photo page 19.

Experiment by W. E. Sprott, Porterville, Cal., Nave!
Oranges, sandy loam soil.

Plot

Fertilizer applied per acre
in pounds

Yield per acre
picking boxes

Increase per acre over
unf ertilized plot
(picking boxes •

1

2
3

No Fertilizer

180 Sulfate of Potash
180 Dried Blood
600 Superphosphate

180 Dried Blood
600 Superphosphate

335
507

381

172
46

Increase from abont |5.00 worth of Potash, 126 boxes,
3ee photo page 20.

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IPOTASH „^

Increase from 320 Ibs. Sulfate of Potash, — 61 boxes.

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POTASH PAYS

21

EXPERIMENTS ON LEMONS ON SANDY
LOAM SOILS

Here is a record of two experiments on a more elabórate
plan made by Mr. J. C. Davidson, of Chula Vista, Cal.,
and J. R. Caldwell, of El Cajón, Cal. These tests, like
those on oranges, show that citrus fruits in California
respond readily to the use of fertilizers and particularly
to potash.

Plot

Fertílizer applied per
acre in pounds

Yield per acre, boxes

Increase over

unfertilized plots

per acre

J. C. Davidson
9 pickings

J.R. Caldwell
4 pickings

50

Davidson

Caldwell

1

No fertilizer

592

2

240 Sulfate Potash
540 Acid Phosphate

708

112

116

62

3

240 Sulfate Potash
180 Nitrate Soda

675

93

83

43

4

180 Nitrate Soda
540 Acid Phosphate

633

104

41

54

5

240 Sulfate Potash
540 Acid Phosphate
180 Nitrate Soda

714

133

122

83

6

360 Sulfate Potash
270 Nitrate Soda •
810 Acid Phosphate

724

93

132

43

The increase from the use of 240 pounds Sulfate of
Potash per acre, was 81 boxes in the case of Mr. Davidson 's
test, and 29 boxes in the test made by Mr. Caldwell.
It is well to note that Mr. Caldwell 's orchard was only six
years oíd and that only four pickings are reportad.

Experiment by Ji C. Davidson, Chula Vista, Cal.

Increase from 240 Ibs. per acre, Sulfate of Potash,— 81 boxes.

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POTAS// PAYS

EXPERIMENT ON CELERY •

This experiment was made by W. E. Gerhard, Santa
Ana, Cal. It was conducted on loóse reclaimed swamp
land which had produced a number of crops and was
evidently worn out so far as an ''available'^ supply of plant
food was concerned. This is shown from the fact that the
yield was more than doubled by the fertilizer applications.
One third of the 90 crates increase produced from the 1300
pounds of the fertilizer used was due to Potash.

The amount of fertilizer applied to each plot, the yield
and the amount of increase are shown in the foUowing table:

Plot

Application per acre
in pounds

Yield per acre
in crates

Increase over

unfertilized plot

(in crates)

1

2
3

No fertiUzer

750 Acid Phosphate
300 Sulfate Potash
250 Nitrate Soda

750 Acid Phosphate
250 Nitrate Soda

70
160

130

90
60

Experiment by W. E. Gerhard, Santa Ana, Cal.

No Fertilizer Yield, 70 Crates per acre

Experíment on Celery by W. E. Gerhard, Santa Ana, Cal.

Complete Fertilizer POTASH, Phosphoric Acid and Nítrogen
Yield, 160 Grates per acre

Incomplete Fertilizer NO POTASH (Phosphoric Acid and NUrogen only)
Yield, 130 Grates per acre

Experimeht on Celery by W. E. Gerhard, Santa Ana, Cal.

Plot No. 1 No Fertilizer (70 crates)
Relative Yields ^ Plot No. 2 WITH POTASH (160 crates)
Plot No. 3 NQ PQTASH (130 crates)

POTASH PAYS 27

SOME SUGGESTIONS ABOUT USING
FERTILIZERS

In the Introduction to this booklet we mentioned the
fact that many fartners and fruit growers often preferred to
buy the ingredients, or "simples" as they are called in
California, and then make their own mixtures. This is a
good way, when the farmer knows how much potash,
phosphoric acid, and nitrogen are needed for the soil and
the crop to be grown thereon.

Of course, the most expensive of the three essential
elements of plant food is the nitrogen, but fortunately
Science lias come to the aid of the farmer and has shown
him how he can obtain a supply of nitrogen at a very
modérate cost. In a few words it may be stated that this
supply of nitrogen comes from the air, which is used by the
bacteria in the soil and by all leguminous crops, of which
clover and cowpeas are the most common. Thus, the
farmer who wants to get cheap nitrogen, raises a leguminous
crop and fertilizes his soil by turning it under. With
proper care and study only comparatively small amounts
of nitrogen, which is expensive whether in the form of
manure or in a commercial fertilizer, need to be bought,
and sometimes it may be omitted entirely, especially when
leguminous crops are grown in rotation.

It is diíferent with the mineral fertilizers, that is with
potash and phosphoric acid. They must be supplied in
certain amounts according to the natural fertility of the
soil, the requirements of the crop grown, and the system
ofcropping.

The following suggestions as to the composition of a
good average fertilizer should prove useful to fármers and
fruit growers who wish to make their own mixtures. The

28 POTASH PAYS

quantity to be used will run from 250 pounds up to 1,000
and even 2,000 pounds per acre. The largest yields and
profits have been obtained by intensive cultivation with
corresponding intensive use of fertilizers.

Citrus Fruits Fo?- Growing Trees

Nitrogen 4 per cent.

Phosphoric Acid 8 per cent.

Potash 7 per cent.

Sulfate of Potash ^ 300 Ibs.

Nitrate of Soda 500 Ibs.

Acid Phosphate (16%) 800 Ibs.

tBone Meal 400 Ibs.

2000 Ibs.
From three Ibs. per tree for the first year, to 15 Ibs. per
tree for the sixth year is usual ly considered a fair
application.

For Bearing Trees

Nitrogen ... 33^ per cent.

Phosphoric Acid 8 per cent.

Potash 123^ per cent.

Sulfate of Potash 525 Ibs.

Acid Phosphate (16%) 1000 Ibs.

Nitrate of Soda 475 Ibs.

2000 Ibs.
■ From ten to twenty-five pounds per tree is the usual
application.

Deciduous Fruits For Growing Trees

Nitrogen 3 per cent.

Phosphoric Acid 93^ per cent.

Potash 10 per cent.

Nitrate of Soda 400 Ibs.

Acid Phosphate (16 per cent. \i9()() lu^
available Phosphoric Acid) J

Sulfate of Potash 400 Ibs.

2000 Ibs.

fNoTE-Bone Meal varíes in composition. In this formula
credit is given for 4 per cent Nitroge-n and 8 per cent Phosphoríc
Acid available during the first year.

POTASH PAYS 29

Fot Bea?'ing Trees

Nitrogen 2 per cent.

Phosphoric Acid 9 per cent.

Potash 11 per cent.

Nitrate of Soda 240 Ibs.

Acid Phosphate (16 per cent.)\ g^Q ^^^
available Phosphoric Acid. J

tSteamed Bone Meal 520 Ibs.

Sulfate of Potash 440 Ihs.

20U0 Ibs.

Vegetables, Potatoes, Roots, etc.

Nitrogen 3 per cent»

Phosphoric Acid 8 per cent.

Potash 11 per cent.

Nitrate of Soda 400 Ibs.

Acid Phosphate (16% Avail.) . .1000 Ibs.

Sulfate of Potash 440 Ibs.

Filler* 160 Ibs.

2000 Ibs.

For Corn, Alfalfa, Clover

Nitrogen 2 per cent.

Phosphoric Acid 8 per cent.

Potash 10 per cent.

Nitrate of Soda 120 Ibs.

Dried Blood (12% Nitrogen). . .. 180 Ibs.
Acid Phosphate (16% Avail.) . . 1000 Ibs.

Muriate of Potash 400 Ibs.

Filler* 300 Ibs.

20U0 Ibs.

This is a good general purpose fertilizer.

*NoTE - Filler is unnecessary but may be used i£ it is desired to
keep fertilizer in bags after mixing. If omitted, each of the plant
food percentages is increased by about eight per cent. It is evident
that with 160 Ibs. of filler to the ton, only 92 per cent as much fer-
tilizer would be required wlthout the filler as with it. With 300 Ibs.
to ton, only 85^ as much.

fNoTE - Calculated on basis of 1 per cent Nitrogen and 10 per
cent. Available Phosphoric Acid.

80 POTASH PAYS

For Wheat and Small Grain

Nitrogen \'% per cent.

Avail. Phos. Acíd 10 per cent.

Actual Potash 8 per cent.

tBone Meal 780 Ibs.

Acid Phosphate (16% Avail.) • • 900 Ibs.

Muríate of Potash 320 Ibs,

2000 Ibs.
• • • —

DESCRIPTION OF FERTILIZER MATERIALS
Materials for Supplying Potash

Muríate of Potash contains 50 per cent, of actual
potash and is one of the most concentrated of plant food
materíals. As a rule, a pound of potash costs less in the
form of muríate than in any other form of potash and for
this reason it is the most popular source of potash in mixed
fertilizers or for home mixing. Muríate of potash is not
generally used, however, on white potatoes, tobáceo or
citrus fruits.

Sulfate of Potash is recommended for citrus fruits,
white potatoes and tobáceo. It may be used upon all
crops for which muríate of potash is recommended, and it
is sometimes preferredfor deciduous as well as citrus fruits.
It occurs as a fine dry powder, and is read ly adapted for
mixing with other fertilizer materials. Sulfate of Potash
usually contains 50 per cent, actual potash and is sold
under a mínimum guarantee of 48 per cent, actual potash.

Kainit is a crude salt; that is, it has not been refined
or manufactured other than being ground into a condition
ready for application as a fertilizer. It is sold under a

fNoTE-Bone Meal varíes in composition. In this formula
credit is given for 4 per cent. Nitrogen and 8 per cent. Phosphoric
Acid available during the first year.

POTASH PAYS 31

guaran tee of 12.4 actual potash. and contains potash, both
iu tlie forms of sulfate and muríate. It contains salts of
magnesia and also common salt. Kainit can be used upon
the crops for which muríate of potash is recommended.

Materials Furnishing Phosphoric Acid.

Materials furnishing phosphoric acid in a highly avail-
able form are acid phosphate, dissolved bone and dissolved
bone black.

Phosphoric acid in a less readily available form, is to
be had in bone meal and Thomas phosphate or basic slag.
The amo un t which is available will depend to a great
extent, upon how finely the material is ground.

Ground bone meal contains, as a rule, from 25 to 2S
per cent, of total phosphoric acid of which 6 to 8 per cent,
may be considered available during the first year. It also
contains from 1 to 4 per cent, nitrogen. Dissolved bone,
acid phosphate and dissolved bone black usually contain
from 14 to 17 per cent, available phosphoric acid.

Materials Furnishing Nitrogen

The principal commercial sources of nitrogen are nitrate
of soda, supplying from 15 to 16 per cent of nitrogen:
sulfate of ammonia, 19 to 20 per cent, nitrogen, and dried
blood from 10 to 14 per cent according to the grade. Tank-
age, in addition to suppljdng from 7 to 9 per cent, nitrogen
usually contains about an equal amount of phosphoric
acid. Of many other sources of nitrogen somewhat less
in general use, we will mention dried fishscrap, containing
from 7 to 9 per cent, nitrogen and b}/¿ to 7 per cent,
phosphoric acid, and cotton seed meal, containing 6J^ to 7
per cent, nitrogen and a small amount of phosphoric acid
and potash.

82 POTASH PAYS

Materials supplying nitrogen should be selected accord-
ing to their relative availability, so that the plant may have
a full supply during the growing season. Nitrate of soda
probably furnishes nitrogen in the most available form.
Sulfate of ammonia is more slowly available but much
more readily ayailable than dried blood, tankage or bi-
products of the slaughter house.

e 9 o

The interests of the farmer are best conserved by an
intelligent interest on his part, in the composition of the
fertilizers whicli he uses. Valuable suggestions have been
given about good general purpose formulas and how to
make them. It is possible however, with a better knowl-
edge of the composition of the materials furnishing the
elements, nitrogen phosphoric acid and potash, to com-
pound fertilizers according to any desired formula. Since
' 'experience is the best teacher, ' ' the farmer who will follow
our suggestions pertaining to plot experiments will have an
advantage over his neighbor who has not made practical
tests with the plant food elements.

As a result of our own experience we are confident
that if these experiments are carefully conducted, eveu
though it may be shown that en some soils and for some
crops one element may be more important than another,
the need of an available supply of potash will be demon-
strated, and when put to the test of profit in dollars and
cents, the conclusión will be that ** Potash Pays."

r