四川玉米高产高效栽培的数学模拟

Mathematical Models of High-Yield and High-Benefit Cultivation for Corn in Sichuan

采用正交旋传组合设计，建立了四川玉米川单９号产量与密度、施Ｎ、施Ｐ和施Ｋ量的二次回归模型．根据数学中函数极大值的概念和农业技术经济学边际效应理论，分别求出当其中三因素处于平均水平时，玉米最高产量和最大经济效益时的密度、施Ｎ、施Ｐ和施Ｋ量．

Quardratic regression equations between the yields of 'Chuandan 9', a corn hybrid in Sichuan, and densities, application rates of N, P and K were established using orthog- onal and rotational combination designs. Based on the equations and the theories of functional maximum values in mathematics and of marginal effects in economics, and under the conditions that the other three factors were in the mean levels. The densities. application rates of N, P and K were calculated, respectively. when both of the maximal yields and maximal benefits of the corn hybrid could be obtained.