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多效唑(PP333)在二年生‘富士’和一年生‘秦冠’幼树上的应用效果表明,根施1～15g/株当年和后两年营养生长受到显著抑制,新梢生长置下降63%～97%;节间长度缩短35%～45%;干径和主枝径增粗率下降35%～85%;‘富士’第二年(3年生)和第三年(4年生)树高、冠径下降45%～55%、70%～75%;根长下降55%～60%.根量减少10%～70%;根皮率提高15%～35%,叶面积下降30%～42%;叶绿素含量提高10%～15%;光合强度提高47%～50%,部分幼树次年和第三年开花(16%和40%);幼树越冬能力提高,抽干率和抽干指数分别下降85%～97%和80%～86%,但顶芽越冬后有10%～15%枯死.适宜的使用时期是新梢长度5～10cm 时(6月中旬).
The application of paclobutrazol (PP333) in biennial ’Fuji’ and annual ’Qinguan’ saplings showed that the vegetative growth was inhibited significantly at the rate of 1 ~ 15g / plant and the growth of shoots was reduced by 63% ~ 97 %; Internode length shortened by 35% ~ 45%; Dry diameter and main branch diameter reduced by 35% ~ 85%; ’Fuji’ second year (third year) and third year Root diameter decreased by 10% ~ 70%; Root bark rate increased by 15% ~ 35%, Leaf area decreased by 30% ~ 42% ; Chlorophyll content increased by 10% -15%; photosynthetic intensity increased by 47% -50%, some saplings flowered in the second and third year (16% and 40%); Decreased by 85% ~ 97% and 80% ~ 86% respectively, but 10% ~ 15% died after the top buds overwintered.The suitable period of use is when the shoot length is 5 ~ 10cm (middle of June).