本文研究了安徽省中北部地区几种类型土壤对钾素的固定作用以及干湿交替、陪伴离子和反应时间对土壤固钾的影响。结果表明：土壤对钾的固定速度很快，绝大部分的钾固定是在４８小时内发生的，潮土、砂姜黑土、黄褐土和水稻土的固钾率分别为３７．１８％、３２．１５％、３１．２６％和１３．４１％；干湿交替明显增加土壤对钾的固定量；陪伴离子ＮＨ的存在对土壤固钾有明显影响，存在“先入为主”和竞争固定现象。 This paper studied the effects of potassium fixation on soil types and alternation of dry and wet, accompanying ions and reaction time on soil potassium fixation in the central and northern part of Anhui Province. The results showed that the fixation rate of potassium to soil was very fast, most of the potassium fixation took place in 48 hours, and the potassium fixation rates of shale, saprolite, limestone and paddy soil were 37.18% 32.15%, 31.26% and 13.41% respectively. Alternating wetting and drying obviously increased the fixed amount of potassium in soil. The presence of accompanying ion NH had a significant effect on potassium fixation in soil, and there existed “preconception” and competitive immobilization.