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在相同土壤条件和施肥量下，对玉米、烤烟进行盆栽对比试验，结果表明：王米抽雄吐丝期地上部吸收氮、磷、钾量的顺序为Ｎ＞Ｋ＞Ｐ，玉米田间小区施肥试验表明：氮、磷、钾肥对玉米的增产效果为Ｎ＞Ｋ＞Ｐ，与其吸收量大小顺序是一致的；而氮、磷、钾肥的优化配比为中氮中磷高钾处理（Ｎ：Ｐ２Ｏ５：Ｋ２Ｏ＝１．０：０．５：０．８～１．０），即施Ｎ１５～１６ｋｇ／６６７ｍ２，Ｐ２Ｏ５ ７．５～８．０ｋｇ／６６７ｍ２，Ｋ２Ｏ１２～１８ｋｇ／６６７ｍ２时，玉米增产效果最明显。因此，在氮、磷常规施肥的基础上，合理施用钾肥能明显提高玉米的产量和肥料的利有率，是土壤补钾、玉米高产栽培的主要措施之一。
Under the same soil conditions and fertilization amount, the pot experiment of corn and flue-cured tobacco was carried out. The results showed that the order of N, P, The results showed that N, P and K fertilizers increased yield of N> K> P for maize, which was consistent with the order of their uptake. The optimal ratio of N, P and K fertilizers was N and P2O5 : K2O = 1.0: 0.5: 0.8 ~ 1.0), that is, N15 ~ 16kg / 667m2, P2O57.5 ~ 8.0kg / 667m2, K2O12 ~ 18kg / 667m2 obvious. Therefore, on the basis of routine fertilization of nitrogen and phosphorus, the rational application of potassium fertilizer can obviously increase the yield of maize and the profitability of fertilizer. It is one of the main measures for high-yield cultivation of potassium and maize in soil.