CHAPTER IV THE PEASANT'S YEAR LET us now turn to the actual day-to-day operations which medieval agriculture made necessary, and let us consider for convenience the task confronting a manorial peasant, who, as we have seen, had his strips in the common fields. In those parts of England where the two-field system prevailed he found himself working on one field during one year while the other field lay fallow, and the next year vice versa. In those areas where the three-field system was in vogue, one field was planted in the autumn with wheat (and perhaps rye) as its main crop, another with oats, vetches, or barley in the following spring, while the third field was fallow. The next year the fallow field was used for wheat, the first for oats, etc., while the second field rested. The third year completed the cycle, and in this elementary fashion men sought to keep their land fertile. It was a wellnigh impossible task, for the number of species they had at their command was very limited: wheat, oats, rye, barley, vetches, beans and peas were the main crops; ro