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钾是植物生长发育所必需的三大营养元素之一。随着农业生产中氮、磷肥的大量施用，作物产量的大幅度提高，种植结构的不断调整和复种指数的不断增加，钾素已成为限制提高作物产量和改善品质的重要因素〔４～７〕。近年来，在冀东地区蔬菜生产中出现了重施氮、磷肥，轻施钾肥的
Potassium is one of the three major nutrients required for plant growth and development. With the large-scale application of nitrogen and phosphate fertilizer in agricultural production, the crop yield has been greatly increased, the planting structure has been continuously adjusted and the multiple cropping index has been continuously increased. Potassium has become an important factor limiting the yield and quality of crops [4~7] . In recent years, in the eastern part of Hebei vegetable production appeared re-application of nitrogen and phosphorus fertilizer, light potassium fertilizer