多效唑在李杏幼树上的应用研究

STUDY ON APPLICATION OF PP_(333) TO PLUM AND APRICOT YOUNG TREES

用多效唑对4年生李、杏的应用试验表明,多效唑处理李、杏幼树15～20天便表现出明显的抑制效果。李树根际沟灌0.2～1.0克/米~2新梢生长量、节间长度、树高及冠径依次下降了60～70％、30％、25～30％及10～25％,杏树沟灌2～3克/米~2,新梢生长量也下降了63～66％。沟灌和叶喷500～2000ppm处理促进了李和杏幼树成花,每厘米新梢的花芽数提高55～65％,单株开花量提高50～290％。其效果可延续2～3年。多效唑处理对果实发育无不良影响。

Trails on application of PP333 to plum and apricot trees at age of four years show that plum and apricot trees treated with PP333 present evident inhibiting effect after 15 to 20 days. When gutters around rhizosphere of plum trees are supplied with 0.2～1.0g/mPP333, growth increment of newly growing shoot, internoai length, height of trees and diameter for crown reduce by 60～70%, 30%, 25～30%and 10～25%, respectively. When gutters of apricot trees are provided with 2～3g/m, the growth increment of newly growing shoot also decreases by 63～66%. Treating with 500～2000 ppm in gutters and on leaves promotes flower formation of plum and apricot young trees. Fruit bud number per cm of newly growing shoot raises 55～65%, flowering number of individual plant increases by 50～290%, and its effect can continue for 2～3 years. Treating with PP333 has no undesirable effect on fruits' development.