激素“B-9”对苹果幼树有抑制生长、矮化树冠、增加叶重、节间变短、封顶早、促进花芽形成、提高单株产量的作用。不同品科喷洒“B-9”的效果不同,金冠较好,国光次之,红星、元帅、印度、青香蕉较差。幼树喷洒“B-9”后,5天内效果不明显,5天以后生长受到抑制,30天内效果明显,50天以后抑制作用逐渐消失。因此,不同地区应用“B-9”的时期应有所不同。雁北区无霜期短,春梢生长量小,6至8月份生长较快。为了抑制秋梢生长,充实花芽,可在7月上中旬喷洒。浓度以2,000 Hormones “B-9” can inhibit the growth of young apple trees, dwarf the canopy, increase the leaf weight, shorten the internodes, cap the leaves early, promote the formation of flower buds and increase the yield per plant. Different branches of goods spraying “B-9” effect is different, Golden Delicious is better, Guoguang second, Red Star, Marshal, India, green banana poor. After spraying “B-9” seedlings, the effect was not obvious within 5 days, the growth was inhibited after 5 days, the effect was obvious within 30 days, and the inhibition gradually disappeared after 50 days. Therefore, the period of application of “B-9” in different regions should be different. Yanbei District frost-free period is short, spring shoot growth is small, growing rapidly from June to August. In order to curb the growth of autumn shoots, full flower buds, spraying in mid-July. Concentration at 2,000