Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

denitrification
nitrogen fixation
nitrification
all of these

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

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

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