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对开封砂土区１０Ｃ个土样进行室内分析和试验。结果表明，土壤全钾变化在１７．３～２７．７ｇｋｇ－１之间，矿物态钾、非交换态钾、交换态钾和水溶态钾分别占全钾量的９６．５％、３．４９％、０．２３％和０．０１％。在相关研究的基础上，建立了诸形态钾量与土壤理化性质之间的多元线性式。用１ｍｏｌＬ－１热ＨＮＯ３连续浸提土壤非交换性钾表征砂土释钾过程，符合ｙ＝ａｘ－ｂ的形式。田间试验结果表明，土壤非交换性钾含量与作物产量之间呈ｙ＝ａｘｂ幂函数显著正相关。相比之下，粗，细质潮土小麦钾肥肥效分别比轻质潮上提高５９％和３６％。
In the Kaifeng sand area 10C soil samples for indoor analysis and testing. The results showed that the change of total potassium in soil was between 17.3 and 27.7 gkg-1, and the content of mineral potassium, non-exchangeable potassium, exchangeable potassium and water-soluble potassium accounted for 96.5% and 3.49 %, 0.23% and 0.01%. On the basis of the relevant research, the multi-linear formula between the amount of potassium and soil physical and chemical properties was established. Continuous extraction of soil non-exchangeable potassium with 1molL-1 of hot HNO3 was used to characterize the process of potassium release, which was in the form of y = ax-b. Field experiments showed that there was a significant and positive correlation between the non-exchangeable K content in soil and crop yield with y = axb power function. In contrast, coarse and fine tide soil potassium fertilizer efficiency than the light tide increased 59% and 36%.