Legumes are frequently grown in rotation with primary field crops. What is the benefit of this practice?

Question

Quizplus · Accepted Answer

Legumes have symbiotic nitrogen-fixing bacteria in their roots that convert nitrogen from the air into a form that is usable by plants. By growing legumes in rotation with primary crops, the nitrogen added to the soil by the legumes can benefit the subsequent primary crops, reducing the need for synthetic fertilizers. This is known as a "green manure" practice.

Legumes Are Frequently Grown in Rotation with Primary Field Crops