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在采用３因素５水平最优试验设计进行连续两年的田间试验基础上，通过回归分析，论述了试验条件下氮、磷、钾肥对甘蔗产量和含糖量的影响．结果表明，无论是新植蔗还是宿根蔗，氮、磷、钾的施用与产量和潜在产糖量之间都存在着二次回归关系，其单因素效应及交互效应对产量和潜在产糖量都产生影响，相对而言，氮对产量、磷对潜在产糖量的影响分别较其它两者为大；产量、纯经济效益及潜在产糖量最佳时的施肥组合为：新植蔗：ＸＮ：３５８５～３９０，ＸＰ：１１５５～１７１，ＸＫ：２６４～２９２５，其取中值时的配比为１∶０３８∶０７４．宿根蔗：ＸＮ：４３０５～５２６５，ＸＰ：２６７～２７３，ＸＫ：３５８５～３９６，其取中值时的配比为１∶０５６∶０７９．
Based on the two-year field experiment with 3-factor-5 optimal experimental design, the effects of nitrogen, phosphorus and potassium fertilizers on the yield and sugar content of sugarcane under the experimental conditions were discussed by regression analysis. The results showed that there was a quadratic regression between the application of N, P, K and potential yield of sugar in both sugarcane and ratoon sugarcane with single factor and interaction effect on yield and potential yield of sugar In contrast, the effects of nitrogen on yield and phosphorus on potential sugar yield were larger than the other two respectively. The fertilization combination with the best yield, pure economic benefit and potential sugar yield was: XN: 358.5 ~ 390, XP: 115.5 ~ 171, XK: 264 ~ 292.5, the ratio of the median when the ratio of 1:0 38:0 74. Rooting sugarcane: XN: 430 52 ~ 526 5, XP: 267 ~ 273, XK: 358 5 ~ 396, the median when the ratio of 1:0 56:0 79.