Abstract
The content of fixed ammonium was analyzed for 12 samples of upland soils, including Saline soils, Sols lessives, Meadow soils, Black-colored soils, and Dark-brown forest soils, collected from Jilin and Liaoning provinces, Northeast China. The content of fixed NH4 + -N ranged from 0.11 to 0.27 g kg-1 and no appreciable differences among the soil types were observed. Fixed NH4 +-N accounted for 9 to 23% of total N in the Ap horizons.
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