Bradyrhizobium
Bradyrhizobium is a genus of Gram-negative soil bacteria that naturally occur as free-living soil bacteria or in symbiotic relationships with legumes. Bradyrhizobium is known for nitrogen fixation, which converts atmospheric nitrogen into ammonia (N2 - NH3). This process allows plants and other organisms to use organic compounds, such as nitrates, more readily. Nitrogen-fixing bacteria such as Bradyrhizobium are crucial to chemical cycles in the soil.