当葡萄果实开始着色时,摘除果穗附近光合效能差的老叶和病虫叶,对提高葡萄产量和品质还是有好处的。首先,葡萄是一种喜光果树,枝叶生长繁茂则影响叶片对光能的吸收,光合效能下降,同化产物减少,引起枝梢生长细弱,叶片质t差,花芽分化不良,病虫为害严重。摘叶遮光试验表明,果实着色期光照强度为自然光的动一70%,比 When the grape fruit begins to color, removal of poor photosynthetic efficiency near the ears of old leaves and pests and leaves, to improve the yield and quality of the grape is still good. First of all, grapes are a kind of hi-light fruit tree. Lush growth of branches and leaves affects the absorption of light energy, the photosynthetic efficiency decreases, the assimilation product decreases, the shoot growth is weak, leaf quality is poor, flower buds are poorly differentiated and pests and diseases are serious. Picked leaves shading test showed that the light intensity of the fruit coloring period of 70% of the natural light, compared with