种植密度和肥料施用量对桂单0811产量的影响

目的]为推进桂单0811在广西的大面积推广种植和应用提供科学依据。方法]以桂单0811为供试材料,采用416-B回归最优设计,分别于2015上半年和2015下半年试验种植两季,研究玉米新品种桂单0811产量与氮、磷、钾肥施用量及种植密度4因素的关系,建立产量的肥密方程,分析各因素对桂单0811产量影响的主效应及互作效应。结果]4个因素变化的效应曲线均为抛物线,对桂单0811产量的影响由大到小依次为种植密度、氮肥施用量、磷肥施用量、钾肥施用量;通过对回归模型的分析,筛选确定了桂单0811实现产量高于9 300 kg/hm~2的密度与肥料耦合优化技术方案,合理种植密度为69 321~90 000株/hm~2,适宜纯氮、磷和钾施用量分别为112.50~186.60、37.50~62.25、93.75~155.55 kg/hm~2。结论]桂单0811较耐密,密度在75 000、81 000、87 000、93 000株/hm~2时产量差异不显著,但考虑到广西玉米的生产条件,在大面积推广示范中推荐采用63 000~69 000株/hm~2的种植密度。

Effects of Planting Density and Fertilizer Application on the Yield of Guidan 0811

Objective] To provide scientific basis for the large-area planting and application of Guidan 0811 in Guangxi.Method] With Guidan 0811 as the test materials,416-B regression optimum design was adopted.Guidan 0811 was planted in spring and autumn 2015,so as to research the relationship between yield of Guidan 0811 and N,P and K dosage and planting density.The fertilizer and density equation were established;and the main effect and interaction effect of the four factors on yield were analyzed.Result]All the 4 factors performed upward parabolic change, and their influences on Guidan 0811 yield of in the two seasons from big to small were in the order of density ,N fertilizer,P fertilizer and K fertilizer.Analysis of regression model showed that the optimum planting density was 69321-90000 plants/hm2 and N,P and Kfertilizer levels were 112.50-186.60,37.50-62.25 and 93.75-155.55 kg/hm2,respectively.Conclusion] Guidan 0811 is tolerant to high density planting,and there is not significant differences in yield among the densities of 75000,81000,87000 and 93000 plants/hm2 .However,considering the planting condition of corn in Guangxi,the density of 63000-69000 plants/hm2 was recommended for Guidan 0811 in the large-scale promotion and demonstration.