苹果幼树主干环剥与涂施多效唑对生长,花芽分化和座果的影响

红富士苹果幼树主干环割三道或环剥皮0.5cm后,加涂不浓度多效唑溶液,均明显抑制了新梢和叶面积的生长,增加了短果枝和花芽数量,显著提高了单株产量,果实硬度约有增加,但因结果过多,品质下降,故应注意采用疏花疏果措施,保证增产增收。施用浓度以4000PPm效果最好。

THE EFFECTS OF PP333 (PALOBUTRAZOL) ON THE SHOOT GROWTH AND FLOWER BUD FORMATION OF YOUNG APPLE TREE

Girdling or ring barking was applied on the stock of young apple trees and smeared with pp333 of different concentration on the place to be girdled or ringed. The growth of shoot and, leaves was inhibited remarkably, but the total number of shoots increased markedly,especially the number of short fruit branches and formation of flowerbuds was promoted. Further mare, the nember of flowers and products of fruit increased with the increase of concentration of pp333. Among them, concentration of 4000PPm is the best.The research indicated that the number of fruit increased and the volume decreased in treated trees. In the meanwhile, the saccharinity and organic acid decreased in fruit, but marked effect was not observed on fruit shape and fruit hardness. In order to keep the quality of fruit , it is necessary to streng then the management of field and decrease the number of flower and fruit.