Fig. 4. Changes in the labeled to total N ratios in NO^-₃ (NL/NT) and NH⁺₄ (AL/AT) pools during incubation of Soil 1, following three different treatments: Treatment 1, 10 mg labeled NH⁺₄–N kg^-1; Treatment 2, 10 mg labeled NH⁺₄–N + 1000 mg C kg^-1; and Treatment 3, 100 mg labeled NH⁺₄–N + 1000 mg C kg^-1. The vertical bars represent ±SD.

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