Legumes enrich soil by adding nitrogen to it through their root nodules.
Legumes are simple, dry fruits or plants that grow in pods. Legumes include soybeans, tamarinds, lentils, green beans and peas. Legumes fix nitrogen in the soil as they grow. Nitrogen serves as an important fertilizer nutrient that is required by all plants for growth. Legumes have Rhizobium bacteria (an organism) which produce nodules on their roots in which nitrogen is being produced. The nitrogen gets to the soil through the legume’s root nodules.