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氮、磷、钾不同配比对水稻生长发育的影响，随施氮量的增加株高和分蘖数明显增加，稻株折损重与施钾量呈极显著正相关，与氮肥施用量呈显著负相关。氮、磷、钾不同配比下的水稻生产最优模型为：Ｙ＝７１９．１９０５＋５７．５１４Ｘ１＋３４．１４６５Ｘ２＋２８．９０６８Ｘ３－１６．７Ｘ１Ｘ２＋１７．２５Ｘ１Ｘ３－３１．８５７４Ｘ２１－１４．２１３９Ｘ２２＋６．８２３５Ｘ２３，最佳经济效益肥料施用量为：Ｎ１７７．８ｋｇ／ｈｍ２，Ｐ２Ｏ５６３．７ｋｇ／ｈｍ２，Ｋ２Ｏ１１８．８ｋｇ／ｈｍ２，最优配比为２．８∶１∶１．９。
The effect of different proportion of N, P and K on the growth and development of rice, the plant height and tiller number increased obviously with the increase of N application rate. There was a significant positive correlation between the damage weight and K application rate, and the N application rate was significant Negative correlation. The best model of rice production under different nitrogen, phosphorus and potassium ratios was Y = 719.1905 + 57.514X1 + 34.1465X2 + 28.9068X3-16.7X1X2 + 17.25X1X3-31.8574X21-14.2139X22 + 6.8235X23, the best economic benefit fertilizer The application rates were: N177.8kg / hm2, P2O563.7kg / hm2, K2O118.8kg / hm2, the optimal ratio was 2.8:1:1.9.