Study on Optimum Fertilization Model of Potato Intercropped with Sugarcane

甘蔗-马铃薯间套种优化施肥模式研究(英文)

[Objective] The paper was to study the effects of different ratios of N, P and K on yield of potato intercropped with sugarcane in Lateritic red earth area of Guangxi, and seek the best N, P and K ratio for nutrition model of potato inter- cropped with sugarcane. [Method]Two field experiments adopted the optimum com- pound design （311-A） were conducted in Long＇an County of Guangxi Province in 2011 and 2012, respectively. The polynomial regression models of fertilizer applica- tion and quadratic of three factors were established by SAS statistical analysis soft- ware, and optimum nutrient simulation models of potato were obtained by computer processing. [Result] The combined application of low nitrogen and mid-high potassi- um and phosphorus fertilizer contributed to higher potato yield in experimental condi- tion. The regression model of potato yield （Yll and Y12） and dosage of N（X1）, P （X2）, K（X3） were established by using SAS statistical analysis software, in 2011 and 2012, respectively. They were Y11 =14 725.28 -415.39X1 ＋741.99X2 ＋607.83）（3-447.92X1X2- 144.09X1X3 -405.83X2X3 -267.82X1^2-795.67X2^2 -642.10X3^2, R =0.927 2; and Y12 =14 342.60 -896.25X1 ＋548.62X2 ＋925.51 X3 ＋67.81 X1X2 ＋531.60X1X3 -99.00X2X3 -904.00X1^2 - 1121.36X2^2-596.64X3^2,R=0.926 6. The regression mathematics model of potato yields preferably fit with actual situation in the locality, and have higher practical value, so it could be used for fertilizer decision and forecast. Using the computer to carry on the optimization, the N, P and K dosage of the best potato yield intercropped with sugarcane was obtained. The dosage of N, P2O5, K2O were 108.8-140.6, 172.5-204.4 and 285.9 kg/hm2, respectively. [Conclusion] The best N, P and K ratio of potato yield intercropped with sugarcane was 1：（1.23-1.68）：（2.03-2.63）.

[目的]为了研究NPK不同配比对广西赤红壤区甘蔗间套种马铃薯产量的效应,寻求适合甘蔗间套种马铃薯营养模式的最佳NPK配比。[方法]采取最优混合设计311-A于2011和2012年在广西隆安蔗地进行甘蔗间套种马铃薯田间试验,运用SAS统计分析软件对试验结果进行回归分析,建立多项式回归模型,并通过计算机程序对模型进行仿真寻优。[结果]在试验条件下,低氮与中高磷钾配施可获得较高的马铃薯产量。用SAS统计分析软件进行分析,可分别建立2011和2012年马铃薯产量(Y11和Y12)与氮(X1)、磷(X2)、钾(X3)用量的回归模型:Y11=14725.28-415.39X1+741.99X2+607.83X3-447.92X1X2-144.09X1X3-405.83X2X3-267.82X12-795.67X22-642.10X32,R=0.9272;Y12=14342.60-896.25X1+548.62X2+925.51X3+67.81X1X2+531.60X1X3-99.00X2X3-904.00X12-1121.36X22-596.64X32,R=0.9266。所建立的马铃薯产量回归数学模型与实际情况拟合得较好,具有较强的实用性,可用作当地甘蔗间套种的马铃薯施肥决策和预报。采用计算机进行寻优,得到甘蔗间套种马铃薯产量最佳的NPK用量,N、P2O5、K2O用量分别为108.8～140.6、172.5～204.4和285.9kg/hm2。[结论]甘蔗间套种马铃薯产量最佳的NPK配比为1(:1.23～1.88):(2.03～2.63)。