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1987～1989年在河南省夏玉米不同生态类型区,采用D—饱和最优设计研究了高产夏玉米(亩产650kg)氮磷配比模式。试验统计表明,氮磷用量与夏玉米产量的关系为y=b_0+b_1N+b_2p+b_3N~2+b_4p~2+b_5NP由于各生态类型区土壤、气候和管理条件不一,各系数差异很大,因而各地所施氮磷的增产效应也不同。每kg纯N在基础产量较高地区增产2～10kg,在基础产量较低地区增产17～24kg;磷肥增产效应在黄褐土和红粘土类型区增产30多Kg,在潮土区增产12～18kg。试验表明,河南省夏玉米不同生态类型区实现650kg的产量水平每亩需N18～24kg,需P_2O_56～12kg。
From 1987 to 1989, in different ecotypes of summer maize in Henan Province, nitrogen and phosphorus proportioning patterns of high-yielding summer maize (650 kg per mu) were studied by D-optimal design. The experimental statistic shows that the relationship between the amount of nitrogen and phosphorus and the yield of summer maize is y = b_0 + b_1N + b_2p + b_3N ~ 2 + b_4p ~ 2 + b_5NP. Because of different soil, climatic and management conditions in different ecological zones, , So the application of nitrogen and phosphorus throughout the yield effect is also different. Each kilogram of pure N increased production of 2 ~ 10kg in the areas with higher basic yield and 17 ~ 24kg in areas with lower basic yield. The yield increase effect of phosphate increased more than 30 Kg in the area of yellow cinnamon and red clay and 12 ~ 18kg. The results showed that the yield of 650kg for different types of summer maize in Henan Province required N18 ~ 24kg per acre and P_2O_56 ~ 12kg.