Nitrogen (N) fertilizers are a necessity in order to meet mankind's need for food and fiber, and N applications can reduce the cost per ton to grow a crop by 30 to 50%. Nitrogen is present in soil and may be applied in both organic and inorganic forms. Organic N is biologically mineralized to inorganic ammonium-nitrogen (NH4-N), which is subsequently nitrified to nitrate-nitrogen (NO3-N). Mineralization and nitrification are
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Huber et al. (1977) studied this question.
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