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苹果种植中,一般某一年产量占其相邻一年产量的30%以下时,即发生了真正的大小年结果。在小年产量占大年产量80%以上时,为轻度大小年结果;占50%到80%以上时,为中度的大小年结果;占30%以下时,为严重的大小年结果。苹果大小年现象有许多害处:果实小,优果率低,果实品质差。由于大年大量结果后,树体营养消耗殆尽,在生长过程中抗寒、抗旱、抗病能力变弱,导
In the cultivation of apples, the average size-year result happens when the output of a certain year accounts for less than 30% of the output of one neighboring year. When the annual output accounts for more than 80% of the annual output, it is a mild annual result; when it accounts for more than 50% and more than 80%, it is a moderate annual result; and when it accounts for less than 30%, it is a serious annual result. Apple size of the annual phenomenon has many harmful effects: small fruit, excellent fruit rate is low, poor fruit quality. Due to the large number of results, tree nutrition depleted, in the growth process of cold, drought, disease resistance weakened, guide