“小国光”是我国丰产苹果中唯一耐贮藏的主栽品种,但有些地区裂果严重,往往丰产不能丰收。为解决这个问题,我所从1974年起开展用B—9防止“小国光”裂果试验,1975—1976年先后扩展到河南、山东、天津等省市进行试验,在不同地区均取得显著效果,并且对提高果实着色度、改善品质、增强耐贮藏性,也有较好的效应。一、防止裂果喷B—9对防止“小国光”裂果效果显著,但必须在开始裂果30天以前喷布。喷B—9后,单果重略有减轻。主要结果如下: “Small country light” is the only storage-resistant varieties of high-yield apple in our country, but serious cracking in some areas, often can not bumper harvest. In order to solve this problem, we started the experiment B-9 to prevent the “Little Country Light” crack test from 1974 and from 1975-1976 to Henan, Shandong, Tianjin and other provinces for testing. We achieved remarkable results in different regions, And to improve the fruit color, improve quality, enhance storage resistance, but also have a good effect. First, to prevent cracking fruit spray B-9 to prevent “Little Light” cracking effect is significant, but must be 30 days before the beginning of the split fruit spray. Spray B-9, single fruit slightly reduced. The main results are as follows: