The gas nitrogen can be incorporated into the soil through which process?
a) Oxidation in the atmosphere.
b) Fixation by free-living microorganism...
The gas nitrogen can be incorporated into the soil through which process?
a) Oxidation in the atmosphere. b) Fixation by free-living microorganisms in the soil. c) Fixation by microorganisms in symbiosis with the host plant. d) Industrial fixation through the production of NH3.
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