土壤中钾素的含量状况是影响钾肥肥效的主要因素。土壤中容易被作物吸收利用的钾主要是速效钾,速效钾包括被粘土矿物所吸附的代换性钾和溶解在土壤水分中的水溶性钾。关于土壤速效钾含量与钾肥肥效的关系,很多单位在水稻上做了大量试验,但在北方旱作物上试验较少。鉴 Potassium content in the soil is the main factor affecting the efficiency of potash fertilizer. Potassium readily absorbed by crops in soils is mainly available potassium, which includes both substituted potassium absorbed by clay minerals and water-soluble potassium dissolved in soil moisture. With regard to the relationship between available-K content and K fertilizer efficiency, many units have done a lot of tests on rice but less on dry crops in the North. Kam