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采用２种化学连续提取法及连续耗钾实验。研究了几种耕作土壤非交换性钾释放特性及有效性。结果表明，供试土壤非交换性钾释放特性和有效性与粘土矿物密切相关。富含伊利石的土壤非交换性钾的释放量大，速率快，有效性高；黑麦草吸收该土壤的非交换性钾量及总吸钾量高，生物量大。而富含高岭石或蒙脱石的土壤非交换性钾有效性明显较低；非交换性钾的释放量和速率、黑麦草吸收该土壤的非交换性钾量、总吸钾量及生物量的均值分别仅为富含伊利石上壤的４６．９６％、４５．５０％、４１．６５％、４３．９０％和６７．５２％。供试土壤耗竭前期非交换性钾有效性高，供钾量大；黑麦草生长良好，生物量大。
Using two kinds of chemical continuous extraction and continuous potassium consumption experiment. The characteristics and availability of non-exchangeable K release from several tillage soils were studied. The results showed that the non-exchangeable potassium release characteristics and validity of soil were closely related to clay minerals. Rich in illite-rich soil non-exchangeable potassium release, fast, high efficiency; ryegrass absorb the soil non-exchangeable potassium and total potassium absorption, biomass. However, the availability of non-exchangeable K in soil enriched with kaolinite or montmorillonite was significantly lower. The amount and rate of non-exchangeable K released, the amount of non-exchangeable K, The mean values of the amount of the illite-bearing soil are only 46.96%, 45.50%, 41.65%, 43.90% and 67.52%, respectively, of the illite-bearing soils. Non-exchangeable potassium was highly effective for the soil depleted at the early stage, and had a large supply of potassium. The ryegrass grew well and had a large biomass.