Typical soils collected from north to south on Loess Plateau were chosen to study the priming effect of ammonium nitrogen fertilizer on soil nitrogen by the Bremner incubation method.The results showed that the sequestration of clay to NH+4-N must be considered in order to get reliable results when measuring the priming effect of NH+4-N on soil nitrogen.The priming effects of NH+4-N on soil nitrogen in different soils were significantly different on 20 d and 60 d (P≤0.01 and <0.05),respectively.On 40 d,p...
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