Relation of spiral girdling of young Longan trees on hastening blossom, yield and soluble sugars.

Relationship of three Logan varieties between hastening blossom and soluble sugars in leaves and root were studied using spiral-girdling compared with ringing and non-treatment in order to solve late-fruiting and low yield caused by fall and winter shoot flushing.It showed that soluble sugars were reduced from the overground to the root and accumulated in leaves using trunk spiral-girdling to Dawuyuan Logan.Therefore,flower bud differentiation was stimulated,and fruit-setting,yield and quality were all promoted.The results also showed that ringing and spiral-girdling differently affect different varieties' flower formation of different stage fall shoot.