What is the role of Rhizobium?

Rhizobium is a bacteria that dwells in the root nodules of leguminous plants in a symbiotic relationship. They fix nitrogen from the air and turn it into soluble nitrates, nitrites, and ammonium compounds. Increased soil production and fertility are aided by nitrogen fixing. The nitrogen gas is captured from the atmosphere and used in their growth and development. When legumes die, the nodules break down and are incorporated into the soil, making it more fertile. Rhizobium is relatively more effective and widely used biofertilizer.