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美国有的学者(Taylor,B.H.and D.C.Ferree,1981)研究苹果夏剪作用认为,苹果夏剪和冬剪对树龄较大的结果树次年新梢抽发无影响,而对幼树来说,夏剪使次年新梢抽发较冬剪少。二学者就夏剪对苹果幼树的影响,进行了幼树光合强度、蒸腾强度、叶片脱落状况、干物质积累方面的生理学研究。他们认为,夏剪具有增强幼树叶片光合强度的趋势和推迟叶片蒸腾低峰到来的作用。夏剪还能推迟苹果落叶期。夏剪能在修剪后的2—5周加速当年秋梢的加长生长,但该秋梢的单叶面积较
Some scholars in the United States (Taylor, BH and DCFerree, 1981) study the effect of apple summer scissors that the summer apple scissors and winter scissors had no effect on young shoots of the older trees in the next year, but young trees, Summer cut so that the next shoot shoot less than the winter cut. Two scholars on the summer cuttings on young apple trees, young tree photosynthetic intensity, transpiration intensity, leaf shedding, dry matter accumulation of physiological studies. They believe that summer shear has the tendency to enhance the photosynthetic intensity of young leaves and delay the onset of leaf transpiration. Summer cut can also postpone the apple leaves. Summer cut can be accelerated in the 2-5 weeks after pruning the growth of the autumn shoot growth, but the autumn tip of the single leaf area than the