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１９９６年我们在含钾丰富的豫西褐土区进行了小麦氮钾配比试验。结果表明，氮钾配合使用，可提高小麦的叶面积系数和植株抗逆性，增加植株的干物重和籽粒千粒重；与单施氮肥相比，平均增产１１．８％；氮钾产量模型为：ｙ＝２３９．８７＋１６．６２７ｘ１＋１３．５２７ｘ２－０．５５７６６ｘ２１－０．８２０９ｘ２２＋０．１０４２ｘ１ｘ２；氮钾合理施肥量分别为２１０、１２４．１ｋｇ／ｈｍ２，最佳配比为１．６９∶１，联应系数为１．０７，施肥利润为３１２３．７５元／ｈｍ２，每公斤Ｎ可增产小麦６．５～５．８ｋｇ，每公斤Ｋ２Ｏ可增产小麦１．６～１１．１ｋｇ，每公斤养分增产小麦８．５８ｋｇ。
In 1996, we conducted the nitrogen and potassium ratio test of wheat in the potassium-rich cinnamon area of western Henan. The results showed that with the combination of N and K, the leaf area index and plant stress resistance of wheat could be increased and the dry weight of plant and 1000-grain weight of plant increased. The yield of nitrogen and potassium was 11.8% y = 239.87 + 16.627x1 + 13.527x2-0.55766x21-0.8209x22 + 0.1042x1x2. The rational fertilization amounts of nitrogen and potassium were 210,124.1kg / hm2 respectively, the best ratio was 1.69:1, 1.07, fertilizer profit is 3123.75 yuan / hm2, yielding wheat 6.5 ~ 5.8kg per kilogram of N, per kilogram of K2O yielding wheat 1.6 ~ 11.1kg, yielding 8.58kg of wheat per kilogram of nutrition .