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    Question

    The addition of which substance is LEAST likely to result in immediate nitrogen loss from the soil?

    A Urea Correct Answer Incorrect Answer
    B Nitrapyrin Correct Answer Incorrect Answer
    C Dicyandiamide (DCD) Correct Answer Incorrect Answer
    D Calcium carbonate Correct Answer Incorrect Answer
    E Ammonium nitrate Correct Answer Incorrect Answer

    Solution

    Nitrapyrin is a nitrification inhibitor; it is designed to prevent the rapid conversion of ammonium to nitrate and thus reduces the potential for nitrogen loss through leaching and denitrification. Urea, calcium carbonate (which can cause volatilization loss under alkaline conditions), and ammonium nitrate are all nitrogen sources that can rapidly transform into nitrate and potentially be lost from the soil.

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