关中夏玉米区陕单308高产栽培技术研究

Study on the High Yield Cultivated Technology of Shaandan 308 in the Summer Maize Planting Region of Guanzhong

采用二次饱和D-最优设计，以关中夏玉米区对陕单308产量影响最主要的密度及氮、磷肥施用量为试验因子，建立了陕单308产量回归模型；分析了产量的主效因子及各因子对产量的效应。结果表明，陕单308在关中夏玉米区有着严格的留苗密度区间，一般留苗50784～56250株/hm^2。氮肥不但是产量的主效因子，而且分别与密度、磷肥交互作用密切，足量的氮肥（N 343.3 kg/hm^2）与适量的密度（50784～59859株/hm^2）互作能够产生较大的增产效果。氮磷搭配施用有利于增加粒重提高产量；提出了目标产量分别为7500～8249 kg/hm^2和8250～9000 kg/hm^2的高产栽培最佳农艺技术措施。

D-saturation optimum design were used to investigate the effect of planting density, nitrogen and phosphorus fertilization on yields of corn shaandan 308 hybrid. The regressive model was set up based on the planting density, nitrogen and phosphorus fertilization. Analysis results showed that planting density significantly influenced the grain yield and the suitable range was 50784 - 59859 plants · hm^2. The dosage of nitrogen fertilization significantly influenced the yield of corn. The in- teraction effects of N fertilization and planting density were positive, the optimum combinations of applied nitrogen 343.3 kg · hm^2 and plant density from 50 784 to 59 869 plants · hm^2 could increase the grain yields. Applied ratio of N and P fertilization could increase the kernel weight to increased yields. The authors provided the agricultural measure and high yield technology design of objective yield range from7 500 kg· hm^2 to8 249 kg· hm^2 and from 8250 kg· hm^-2 to9 000 kg· hm^-2.