Microbiology of Soils
Nitrogen oxidation (nitrification)refers to the

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

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Microbiology of Soils
Denitrification is

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

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