Abstract:
【Objective】 This project aims to study the relationship between the canopy structure and yield and quality of the layered spindle of apples by analyzing the suitability of the tree structure in the hope of providing basis for the pruning of the spur-type apple.
【Method】 The layered spindle apple tree was used as research object to measure the microclimatic factors, branches, canopy structure and yield and quality parameters of the canopy and analyze and contrast the differences in different canopy layers.
【Result】 The light intensity, temperature, ACF, DIFN and MTA increased with the increase of crown height; humidity, main branch length, main branch thickness, canopy volume, LAI and yield decreased with the increase of crown height; in terms of fruit quality, the differences only existed between the upper, middle and lower layers, however, there was no significant difference in other quality indexes among different layers, where the fruit quality consistency remained quite high. The yield was mainly concentrated in the middle and lower part of the tree canopy, which was convenient for pruning, tree management and picking.
【Conclusion】 The average yield was 40,392 kg/hm
2 in lower part of the canopy, 15,081 kg/hm
2 in the middle part and 8,316 kg/hm
2 kg/hm
2 in the upper part, with the yield concentrating in the middle and lower parts,and convenience to manage and harvest, with good ventilation and light conditions, high yield, high consistency of fruit quality, the apple layered spindle canopy has good application value.