1　早期落叶叶片是光合作用的场所 ,是碳水化合物生产的工厂。早期落叶 ,果实糖度低 ,着色不良 ,品质低劣 ,贮藏养分蓄积不足 ,影响翌年的花芽分化。葡萄栽培保持叶片至最后健全 ,是栽培成功的关键措施之一。　　早期落叶的起因是水分不足 ,Cu和石灰等药害 ,B、Mg等要素欠缺引 1 early deciduous leaves are photosynthetic sites, is a carbohydrate production plant. Early deciduous, low sugar content of fruit, poor coloring, poor quality, lack of storage of nutrients accumulated, affecting the flower bud differentiation the following year. Viticulture to maintain the leaves until the final sound, is one of the key measures of success of cultivation. The causes of early deciduous leaves are insufficient water, Cu and lime and other phytotoxicity, lack of B, Mg and other factors