山西省西部黄土丘陵、中部盆地和东部丘陵土壤缓效钾含量由北向南逐渐增加.其释放过程符合幂回归(y=ax~(-b)).其释放容量是:保德红土>午城黄土>黑垆土、(土娄)土(褐土)>绵沙土,但释放强度则相反.土壤缓效钾释放累积量与不同土壤类型缓效钾释放容量一样,是从北向南逐渐增加的. The slow-acting potassium content of loess hilly, central basin and hilly land in western Shanxi gradually increased from north to south, and its release process was in accordance with the power regression (y = ax ~ (-b)). Loess> black soil, soil (cinnamon soil)> mound sandy soil, but the release strength is the opposite. The cumulative release of slow-release soil potassium is the same as that of slow-release potassium in different soil types, increasing from north to south .