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进入盛果期的苹果树,一年结果很多,一年或几年结果很少,这种现象叫果树大小年结果。大小年结果不仅造成产量下降,品质变劣,而且容易招致和加重树体病害的发生。造成大小年结果的主要原因是肥水管理条件差、修剪不当、花果留量过多和病虫防治不及时等。针对形成大小年结果的具体原因,采取综合措施,大小年现象是可以克服的。一、肥水管理。加强肥水管理,改善树体的营养水平,是克服大小年的根本措施。要做到巧施追肥,重施基肥。巧施追肥要求:(1)大年重施花芽分化肥。大年由于开花座果较多,消耗了大量养分,到花芽分化期,往往贮存营养已经不足,对花芽分化不利;为弥补养分不足,必须在春稍缓长期,花
Into the fruiting stage of the apple tree, a lot of results a year, a few years or few results, this phenomenon called fruit size year results. Year-to-year results not only lead to decline in yield, quality deterioration, but also easily lead to and increase the occurrence of tree diseases. The main causes of the size of the year results are poor water and fertilizer management conditions, improper pruning, too much retention of fruit and pests and insect pest control is not timely and so on. In view of the specific reasons for the formation of annual results of size and size, comprehensive measures can be taken to overcome the size-year-year phenomenon. First, fertilizer and water management. Strengthening the management of fertilizer and water and improving the nutrition level of tree are the fundamental measures to overcome the size of year. To do clever dressing, heavy basal fertilizer. Qiao facilities Top dressing requirements: (1) New Year re-applied flower buds fertilizer. New Year because of flowering more fruit, consume a lot of nutrients, to the flower bud differentiation, nutrition is often not enough storage, unfavorable to flower bud differentiation; To make up for lack of nutrients, must be slow in the spring long, flowers