PP333这种新型高效的植物生长延缓剂,由于抑制株体内赤霉素的生物合成,从而限制植株的过旺营养生长,促使同化产物向生殖生长转化,对幼旺果树能起到控冠、促花、早果、丰产的作用。目前,国外已在多种果树上应用,收效明显。我国应用PP333的研究起步较晚,近几年来已在梨、苹果、葡 PP333, a new and effective plant growth retarding agent, can inhibit the excessive vegetative growth of plants due to the inhibition of gibberellin biosynthesis in plants, and promote the transformation of assimilation products to reproductive growth, which can control crown and promote the growth of young fruit trees. Flowers, early fruit, the role of high yield. At present, foreign countries have applied a variety of fruit trees, with obvious results. The application of PP333 in China started late, and in recent years it has been in pear, apple and grape