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本研究表明高产玉米（亩产８００公斤）的叶片出叶速度大小依次是基部三叶＞中上部叶片＞顶部叶片＞中下部叶片。粒叶组的叶片生长速度、叶面积和光合势与穗叶组相当或更高，第十六叶（非穗位叶）的生长速度最大。群体叶面积发展动态呈Ｓ型曲线，但中期稳定、后期下降平稳；抽雄期叶指数达６．６４，自此以后３０多天叶指数稳定在６以上，至蜡熟时叶指数仍达３．９９。在种植密度高达每亩４８００株的情况下获得较高的叶指数和光合势，并使光合势在生长后期分配比例高达７９６％，夺得每亩产量８５０公斤的高产，从而对叶片“衰亡期”的合理性和高密度必然导致叶片早衰的观点提出异议。
This study showed that the leaf output speed of high-yielding corn (800 kg per mu) followed the order of basal top> top middle> top> middle and bottom leaves. The leaf growth rate, leaf area and photosynthetic potential of the leaf group were comparable to or higher than those of the leaf group, and the growth rate of the 16th leaf (non-ear leaf) was the highest. The development of population leaf area showed a S-shaped curve, but the mid-term stability, the latter part of the decline stable; tasseling leaf index reached 6.64, since more than 30 days after the leaf index stable at 6 or more, until the waxy index is still up to 3 leaf. 99. In the planting density up to 4,800 acres per acre obtained higher leaf index and photosynthetic potential, and the photosynthetic potential distribution in the late growth stage as high as 796%, won 850 kg per acre yield of high yield, thus the leaf “decay period ”The rationality and high density will inevitably lead to the viewpoint of leaf premature aging objections.