Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Nitrifying bacteria
De-nitrifying bacteria
Cyanobacteia
Pectin decomposing bacteria

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Microbiology of Soils
Denitrification is

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

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