近年来在玉米杂交制种工作中，推广了带叶去雄经验，即在母本雄穗生成末抽出前，带互～2个顶叶拔除，这一措施能够充分保证种籽的纯度。但叶片是光合器官，种籽产量的多少，决定于有多少有效叶面积在工作。玉米植株的上部叶片，叶龄最轻，生理机能最旺盛，而且通风、光照条件都 In recent years, hybrid seed production in maize, to promote the experience of the removal of the male leaf, that is, in the mother tassel spawn before the end of extraction, with ~ 2 top lobes removed, this measure can fully ensure the purity of the seeds. However, leaves are photosynthetic organs, the amount of seed yield, depending on how much effective leaf area at work. Upper leaves of corn plants, leaves the lightest, most vigorous physiological function, and ventilation, lighting conditions are