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本文通过对盐碱湿地井灌水稻氮、磷、钾三要素配方施肥试验结果分析，得到了三要素与水稻产量的数学模型：ｙ＝７３６２．８４８＋５８６．４７２ｘ１＋４９５．９５４ｘ２＋２０９．７３９ｘ３＋１０２．８２６ｘ１ｘ２＋９１．９３１ｘ２ｘ３－２９８．４４８ｘ２１－２６４．２６２ｘ２２－２４１．８８５ｘ２３计算出模型最优解为：施纯氮２３５．４５ｋｇ／ｈ，施磷（Ｐ２Ｏ５）８５．８２ｋｇ／ｈｍ２，施钾（Ｋ２Ｏ）６３．５８ｋｇ／ｈ，并得到了最佳效益施肥量为：施纯氮为２０７．８５ｋｇ／ｈ，施磷为（Ｐ２Ｏ５）７８．１２ｋｇ／ｈ，施钾（Ｋ２Ｏ）为５９．６０ｋｇ／ｈ，最佳施肥配方比例为３．５∶１．３∶１。
In this paper, the mathematical model of three factors and the yield of rice was obtained by analyzing the experiment results of formula fertilization of nitrogen, phosphorus and potassium in well-irrigated rice in saline-alkali wetland: y = 7362.848 + 586.472x1 + 495.954x2 + 209.739x3 + 102.826x1x2 + 91.931x2x3-298. 448x21-264.262x22-241.885x23 The optimal solution of the model was calculated as 235.45kg / h of pure nitrogen, 85.82kg / hm2 of phosphorus (P2O5) and 63.58kg / h of potassium (K2O) The optimum amount of fertilizer application was as follows: nitrogen application rate was 207.85kg / h, P2O5 was 78.12kg / h, K2O was 59.60kg / h, and the optimal proportion of fertilization was 3. 5: 1.3: 1.