Three-field crop rotation
The three-field system of crop rotation was employed by medieval farmers, with spring as well as autumn sowings. Wheat or rye was planted in one field, and oats, barley, peas, lentils or broad beans were planted in the second field. The third field was left fallow. Each year the crops were rotated to leave one field fallow. This system also ensured that the same crop was not grown in the same field two years running.