苹果、梨等果树进入盛果期后,往往出现一年结果多或一年结果少的现象,这就是人们所说的“大小年”果树形成“大小年”结果的原因较为复杂。如在风调雨顺的的年份。肥水充足,形成花芽较多,而在冬剪时和花期又没能合理地调整花芽量,最后造成超量结果,出现“大年”。“大年”树结果的同时,由于种子增多而合成的赤霉素(生长刺激素)量也随之增多.树体内营养积累减少, When fruit trees such as apples and pears reach their full fruit-bearing period, they often have the result of more than one year or few results for one year. This is why the “size year” result of the formation of “size year” results is more complicated. As in a good year. Feishui enough to form more flower buds, and in the winter and flowering and can not reasonably adjust the amount of flower buds, resulting in excess results, the emergence of “big year.” At the same time, the amount of gibberellin (growth-stimulating hormone) synthesized due to the increase of seeds is increased along with the results of the “New Year” tree, and the accumulation of nutrients in the tree is reduced,