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采用Ｈ饱和树脂吸收法研究了陕西６种土壤非交换钾释放的动力学性质。结果表明：①黄土性土壤非交换钾释放量和释放速度与风砂土类似，远高于暗棕壤；②供试土壤不同时段的非交换钾释放速度不同，０～７２ｈ的释放速度远大于７２～９１２ｈ的钾释放速度；③供试土壤非交换钾释放过程在９１２ｈ内用直线方程描述拟合最好；④供试土壤非交换钾释放速率常数Ｂ主要决定于粘粒与缓效钾含量。常数Ｂ和非交换钾释放速度Ｖ可用于土壤供钾能力评价。
The kinetics of non-exchangeable potassium release from six soils in Shaanxi province was studied by H-saturated resin absorption method. The results showed that: ①The release and release rate of non-exchangeable potassium in loessial soil was similar to that of sandy soil, and it was much higher than that of dark brown soil. ② The release rates of non exchangeable potassium in different periods were different, 72 ~ 912h potassium release rate; ③ soil non-exchangeable potassium release process within 912h described by a straight line equation fitting best; ④ test soil non-exchangeable potassium release rate constant B mainly depends on the clay and slow-acting potassium content . The constant B and the non-exchangeable potassium release rate V can be used to evaluate the potassium availability in soil.