Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

All of these
Azotobacter
considerably less important in comparison to the symbiotic bacteria
Clostridium

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Microbiology of Soils
Denitrification is

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

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