Abstract:

The being grown ‘Red Fuji’ apple airtight orchard was used to the study, there were three different thinning methods, interlaced thinning(A), septum strain thinning(B), every four trees cutting one in the line(C) and the control(CK), and the effects of different methods on group structure and fruit quality. The results showed that compared with CK, three different thinning methods got different degree of optimization, the ratio of leaves witches branches, short shoot and long shoot increased while water sprout decreased; at the beginning, the coverage rate and branch quantities per hectare declined significantly and recovered year by year; the overlap rate among individual trees of A declined while the overlap rate between the lines B declined significantly; the leaf area index reduced, leaves size largened and thickness of hundred leaves increased; the connect fully conditions of the orchard improved obviously. Fruit appearance quality such as average fruit weight, tinge, shading area and high quality fruit rate were better than CK after thinning. Fruit internal quality such as fruit flavor and texture were better than CK, titration acid content declined, and hardness increased. The conclusion was that appropriate thinning methods could fundamentally improve apple airtight orchard group structure and fruit quality, in terms of general effect, B was the best thinning method and A placed the second.