Microbiology of Soils
The microbial ecosystem of soil includes

biotic and abiotic components of soil
abiotic components of soil
biotic components of soil
None of these

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

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

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