苹果的早期落果,在果实从树上脱落前6—10天就已经停止了生长,脱落的果实比发育正常的果实种子少,赤霉素和细胞分裂素的活性也较低。所以,我们认为,早期落果中生长调节物质的高低与果实间的养分竞争有关。同时发现,含种子多的果实也发生落果。可见,苹果早期落果的主要原因不仅有果实的养分竞争,而且也存在果实与新梢间的 Apple’s early drop, 6-10 days before the fruit peeled off from the tree has stopped growing, off the fruits of fruit than the normal development of seed less gibberellin and cytokinin activity is also low. Therefore, in our opinion, the level of growth regulators in early fall fruit is related to nutrient competition between fruits. At the same time, it is also found that fruits containing more seeds have also fallen into fruit. Can be seen, the main reason Apple early drop fruit is not only the fruit of nutrient competition, but also between fruit and shoot