采用“311-A”最优混合设计进行田间试验，寻求桂中蔗区适合机械化栽培的氮、磷、钾肥施用量不同配比对甘蔗产量的效益方案，运用 SAS 统计分析软件对试验结果进行回归分析，建立回归模型，寻出甘蔗产量的 N、P、K 最佳组合及其最佳配比用量。桂糖31号最高产量的施用量(kg/hm2)：N=267.75，P2O5=341.40，K2O=455.25，N：P：K配比为1：1.28：1.7；最优产量施用量(kg/hm2)：N=155.25， P2O5=341.40，K2O=117.75，N：P：K配比为1：2.2：0.76；柳城05-136最高产量的施用量(kg/hm2)：N=117.75， P2O5=341.40，K2O=455.25，N：P：K配比为1：2.9：3.9；最优产量施用量(kg/hm2)：N=117.75，P2O5=341.40， K2O=117.75，N：P：K配比为1：2.9：1。%A field experiment was conducted with “311-A” optimal combination design to find the best NPK fertilization scheme for mechanical cultivation of sugarcane in the central part of Guangxi. SAS was employed for regression analysis and for finding an optimal fertilization formula. Formula for the greatest yield of Guitang 31 were (kg/hm2): N=267.75, P2O5=341.40, K2O=455.25 with N:P:K ratio of 1:1.28:1.7, and formula for the optimal yield were (kg/hm2): N=155.25, P2O5=341.40, K2O=117.75 with N:P:K ratio of 1:2.2:0.76. Formula for the greatest yield of Liucheng 05-136 were (kg/hm2): N=117.75, P2O5=341.40, K2O=455.25 with N:P:K ratio of 1:2.9:3.9, and formula for the optimal yield were (kg/hm2): N=117.75, P2O5=341.40, K2O=117.75 with N:P:K ratio of 1:2.9:1.
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