已进入盛果时期的苹果树,往往出现大小年结果现象,尤其在管理粗放、肥水不足的情况下,这种现象更为严重。大量结果的年分,树体营养消耗量过大,无法弥补其不足的养分,对树体的生长和发育影响极大,造成树势衰弱,隔年结果,果品质量低劣,甚至遭致腐烂病,引起整株死亡,给生产带来严重后果。这是在苹果生产上急待解决的一个重要的实际问题。 The apple trees that have entered the flourishing period often have the result of size-year results, especially in the case of extensive management and inadequate water and fertilizer. This phenomenon is even more serious. A large number of results in the year, tree nutrition consumption is too large, can not make up for its lack of nutrients, the tree growth and development of a great impact, resulting in bouts of weakness, the following year results, poor fruit quality, or even cause rot, Cause whole plant to die, bring serious consequence to production. This is an important practical problem to be solved urgently in the production of apple.