Microbiology of Soils
Denitrification is

reduction of nitrate (NO3-) to nitrogen gas
reduction of nitrate to organic nitrogen compounds
both (a) and (b)
changing of atmospheric nitrogen (N2) to nitrogen compounds

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Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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