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本文提出了估算钾肥用量的吸附直线法．由于求出的推荐施肥量因土壤类型不同，差异较大，又经田间试验，确定了砂质潮土、砂姜黑土和黄棕壤宜采用推荐施肥量的下限；水稻土以采用上限为宜；而壤潮土和粘质潮上可根据投资能力及钾肥的供求状况选取上限或下限．
In this paper, we propose a linear adsorption method to estimate the amount of potash fertilizer. Because of the different recommended soil fertilization rates due to different soil types, the lower limit of the recommended fertilization rate for sandy loam, saprolium black soil and yellow brown soil was determined by field experiments. The upper limit of paddy soils should be appropriate ; While the soil tide and sticky tide can be based on investment capacity and supply and demand of potash choose the upper or lower limit.