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

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

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

measuring15N2 by mass spectrometer
All of these
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
demonstrating growth in a nitrogen free medium

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