不同生态条件下紧凑型玉米正红6号高产密肥优化研究

采用2因素5水平裂区试验设计方法,研究了种植密度和施氮量对正红6号产量的影响.结果表明:不同生态条件下正红6号的产量水平和经济性状不同,但各生态条件下的产量均随种植密度和氮肥水平的增加而先增后减.建立了3种生态条件下产量与种植密度和氮肥水平之间的二次回归模型,并通过频数统计分析法得出了各生态条件下的高产密肥优化方案.寡日照地区适宜的密度和氮肥水平相对较低,土层瘠薄的三台土适宜的氮肥水平较高.

Study on the Optimization Scheme of Planting Density and Nitrogen Rate for High-yield and Compact Maize Zhenghong No.6 Under Different Ecological Conditions

By field experiments with split-plot design, the effects of planting density and nitrogen rate on grain yield and compact hybrid maize Zhenghong No.6 were studied.The grain yield of Zhenghong No.6 were different a-mong the three experiment locations.With increasing of planting density and nitrogen rate, grain yield were increased firstly and decreased secondly.Quadratic regression equation of grain yield to planting density and nitrogen rate were founded under the three ecological conditions.The optimization scheme of planting density and nitrogen rate were cal-culated by frequency distribution statistics respectively.It was found that the optimal model were different among the three experiment locations.The optimal planting density and nitrogen rate in Ya'an which had lower sunshine time and fertile field was less than that of Nanchong which had more sunshine time and infertile field.The optimal nitrogen rate in Nanchong 1 located on the mid-top part of a hill with thin soil layer was more than that of Nanchong located on the basal part of a hill with thick soil layer.