玉米是单位面积株数较少而单株生产力较大的作物,这两者之间是相互影响的。近年来,很多人从群体生理角度来调整其间的关系,得到了一定的效果,但在未摸清其个体生理特性之前要从群体角度来解决也很难达到如期愿望。最近不少人在叶片功能方面进行了研究,但大都从不同叶层对产量形成的作用上,联系生理特性不多, Maize is a crop with a small number of plants per plant and a large productivity per plant, and the two are mutually influential. In recent years, many people have adjusted their relations from the point of view of group physiology and obtained certain effects. However, it is very difficult to reach the desired goal from a group perspective without understanding their individual physiological characteristics. Recently, many people have studied leaf function, but mostly from different leaf layer on the role of the formation of the output, the relationship between physiological characteristics,