Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

All of these
Clostridium
Azotobacter
considerably less important in comparison to the symbiotic bacteria

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Microbiology of Soils
The groups of symbiotic bacteria, which have the ability to fix nitrogen

grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
All of these
these bacteria are from the genus, Rhizobium

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