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对 1 0个不同母质土壤进行生物吸钾试验和化学测定 .结果表明 ,二级动力学方程dkt/dt=k(k0 -kt) 2 可以很好地描述连续提取条件下土壤释钾特性。初始释钾速率与有效钾含量呈极显著正相关 ,与黑麦草生物总量及吸钾总量均呈极显著正相关 .2mol/LHNO3提取的释钾速率相关显著性明显高于氢质树脂法 ,其中 0～ 2h的土壤释钾速率能较好地描述土壤钾的有效性
Potassium bioassay and chemical determination of 10 different parent soils were carried out. The results showed that the second-order kinetic equation dkt / dt = k (k0 -kt) 2 can well describe the potassium release characteristics under continuous extraction. There was a significant positive correlation between the initial potassium release rate and the available potassium content and the extremely significant positive correlation with the total amount of ryegrass and total potassium uptake.The correlation coefficient of potassium release from 2 mol / LHNO3 extraction was significantly higher than that of the hydrogen resin method , In which 0 ~ 2h soil potassium release rate can better describe the effectiveness of soil potassium