果树生产上常有一年产量高、一年产量低的大小年现象。果树产生大小年的原因是什么呢?首先它和树体营养条件有关。当果树结实过多时,营养大量消耗在果实上,枝条生长和花芽分化受到影响,到第二年花量减少,花芽发育不良,座果率低,造成产量上的小年。在结实少的一年里,树体积累的营养较多,枝条生长良好,促使结果母枝数量增加,同时花芽多而饱满,使翌年硕果累累,形成了大年。近来研究证明,果树大小年的产生,也和树体内激素的形成有着密切关系,特别是赤霉素能抑制花芽的分化,赤霉素大多是在种子中 Fruit trees often produce high annual output, low annual size of the year phenomenon. What are the reasons for the size of the fruit tree? First, it is related to the nutritional conditions of the tree. When the fruit tree is too strong, the nutrition is consumed in a large amount on the fruit, the growth of branches and flower bud differentiation are affected, and the flower quantity is reduced in the second year, the flower buds are stunted and the fruit set rate is low, resulting in a small year on the yield. In the sturdy year, the tree accumulated more nutrients, branches grow well, prompting the increase in the number of female parent, at the same time flower buds and full, so that the following year fruitful, the formation of the New Year. Recent studies have shown that the generation of fruit trees in the year, but also the formation of hormones and the tree has a close relationship, in particular, gibberellin can inhibit the differentiation of flower buds, gibberellin mostly in the seeds