秋玉米间作秋大豆优化种植技术研究

旱粮是我省粮食生产的薄弱环节，而江西适于发展玉米间作大豆的秋闲田则有近２７万ｋｍ＾２，发展旱粮的潜力很大。本试验采取二次通用旋转组合设计，选择了间作行比、大豆密度以及氮、磷、钾肥施用量５个试验因子，建立了试验因子与间作体系的总量、能量总产出、０．０６７ｈｍ＾２（亩）产值间作玉米产量、大豆产量间的数学模型。

OPTIMIZATION OF CULTURE PRACTICES FOR LATE-CROPPING CORN INTER CROPPED WITH SOYBEAN

While the upland cereals such as corn and soybean are the weak aspects of food crop pro-duction in Jiangxi Province,the area of the fallow field which is suitable to the growth of cornintercropped with soybean is nearly 267 thousand hectare. So the poteintial productivity of up-land food crops is great. The quardratic regression rotation combination design was applied inthis experiment in which the row ratio of intercropping(soybean/corn ),soybean density(plant/bunch)and the quantities of nitrogen,potassium and phosphorus were chosen to be ex-perimental factors. As a result of statistics on the microcomputer,five mathematical modelswere set up which showed the relationships of five experimental factors with the total yield ,the total energy output,the yield value of the intercropping system,the corn yield and soy-bean yield respectively. Through the analysis of the yield model,it was known that:1)the row ratio of inter-cropping and the quantity of phosphor us were the most important factors influencing the totalyield of the intercropping system;(2)the mutual effect between the row ratio and soybean den-sity was a positive one which meant a high row ratio should be coupled with high soybean den-sity to get optimum yield;(3)the multual effect between the soybean density and the quantityof nitrogen was a negative one which meant the high soybean density should be coupled withlow amount of nitrogen appllcation. By stimulation of the yield model,the optimal culture prac-tices with total yield more than 4 500 kg per hectare were achieved which were a set of reliabletechnique to be applied in production.