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长江下游灰潮土上进行的薄荷ＮＰＫ 三要素田间试验结果表明，ＮＰＫ 平衡施肥处理薄荷鲜草产量最高，氮、磷、钾肥的增产效果大小顺序为Ｋ＞ Ｎ＞ Ｐ。每千克Ｋ２ Ｏ 对头刀薄荷鲜草产量增产率最高，为６４ ．５ｋｇ 。钾肥提高产量的机理主要是提高薄荷的总叶节数、存叶重和降低落叶率。磷、钾肥均有较大的残留效应，钾肥残效可使二刀薄荷鲜草增产２０ ％ 以上，磷肥则可增产１５ ％ 。
The results of NPK three-element experiments on gray soil in the lower reaches of the Yangtze River show that NPK balanced fertilization has the highest yield of mint fresh grass, and the order of increasing yield of nitrogen, phosphorus and potassium fertilizer is K> N> P. Kilo per kg K 2 head pair of fresh grass mow yield growth rate of 64. 5kg. Potassium fertilizer to increase the yield mechanism is mainly to improve the total leaf number of mint, stored leaf weight and reduce the rate of decay. Phosphorus, potash have greater residual effect, Potash residue can make two knife mint fresh yield more than 20%, while phosphate fertilizer can increase 15%.