What Processes Contribute Directly to Soil Nitrate Concentrations

question 8

Multiple Choice

What processes contribute directly to soil nitrate concentrations?

• A)Nitrification by bacteria and weathering of rock.
• B)Nitrification by bacteria, but not weathering of rock.
• C)Ammonification, but not nitrification by bacteria.
• D)Ammonification and nitrogen fixation by bacteria.

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