Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

None of these
conversion of ammonium ions into nitrates through the activities of certain bacteria.
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
changing of atmospheric nitrogen (N2) to nitrogen compounds

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

these bacteria are from the genus, Rhizobium
grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
All of these
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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Microbiology of Soils
Nitrogen fixation

fix the free nitrogen (N2) by which it should not be usable by plants
both (a) and (b)
especially changes nitrogen compounds, mostly amines such as NH2
changes the free nitrogen (N2) to a form usable by plants

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