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

nitrogen fixation
all of these
nitrification
denitrification

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Microbiology of Soils
Denitrification is

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

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