The four-crop rotation method, also known as a four-field system or Norfolk rotation, is a traditional agricultural practice involving the sequential cultivation of four different crops in a recurring cycle. The four crops commonly used in this rotation are wheat, turnips, barley, and clover. The cycle typically involves planting wheat, followed by turnips, then barley, and finally clover. Each crop serves specific purposes, such as providing food, improving soil fertility, and diversifying production. This method helps in nutrient cycling, pest and disease management, and maintaining soil health.