杂交玉米皖试3号高产栽培技术研究

Study on Cultivation Technology of High Yield Combination of Hybrid Maize Wanshi No.3

采用四因素五水平二次回归正交旋转组合设计,建立了皖试3号产量(Y)与密度(X1)、施氮量(X2)、复合肥量(X3)和施钾量(X4)的数学模型。对回归方程进行了统计选优和降维分析。结果表明,各因素的重要性依次为密度、施氮量、施复合肥量、施钾量;产量在9 000 kg/hm2以上的栽培模式为密度78 845～80 892株/hm2,氮肥用量为尿素380～423 kg/hm2,复合肥用量为597～700 kg/hm2,氯化钾178～218 kg/hm2。

The mathematical model of planting density,application amounts of nitrogenous,complex fertilizers and potassium fertilizers to yield of maize variety Wanshi No.3 was estabilished by means of quadratic orthogonal regressive rotation combination design with four faeters and five levels. For the regression equation,statistical optimum choosing and the analysis of dimension reduced have been analyzed. The results showed that four factors are in this following order of importance： planting density, amount of nnutrition, amount of complex fertilizers, amount of potash fertilizers. The optimal cultural methods for yields above 9 000 kg/ha, according to the mathematical model was as followed： the density was 78 845 - 80 892 plants/ha, applying nitrogenous（earbamide） 380 - 423 kg/ha, complex fertil- izers 597 - 700 kg/ha, potassium ehloride（KCl） 178 - 218 kg/ha.