Fig. 1. Dynamics of total NO-3–N (NT) and NH+4–N (AT) accumulation in soils following imposition of different treatments: Treatment 1, 10 mg labeled NH+4–N kg-1 only; 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.