In order to investigate the content change of non-exchangeable ammonium nitrogen during the process of soil organic nitrogen mineralization,the typical soils collected from north to south on Loess Plateau were chosen as the material,and the Bremner incubation method was conducted and the soils were incubated for 60 d.The results showed that the contents of non-exchangeable NH4+-N increased with increasing the incubation time.The amount increased for non-exchangeable NH4+-N existed significant difference(P=0...
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