To preserve soil nutrients and increase the number of bushels
of corn or wheat harvested per acre, farmers rotated what
they planted. For example, in one field, a farmer planted
oats one year, wheat next, and corn the next. Then, for two
years, the farmer let clover or alfalfa grow to put nitrogen
back in the soil. The alfalfa would also provide hay to feed
horses, mules, and cattle.
Written by Claudia Reinhardt.