Analysis on Free Spindle Pruning Mode and Related Factors in Fuji Apple

According to the culture characteristics of the tree structure and the characteristics of canopy formation of dwarf rootstock apple trees, the shaping of young trees should be completed in about 3 years, and the first two to three years of shaping is the key. [...]the pruning modes of slender spindle or free spindle are commonly used13 -4]. According to the following formula, the tapering grade of the Fuji apple under the tree structure was calculated. In order to obtain ideal high-yield tree structure, the number of main branches is required to be large, that is, the growth thickness is relatively small, and the total length and the average length are both small. [...]in addition to appropriately increasing the height of the trunk, it is necessary to bud many times before germination to promote branching. Studies have shown that if trees have good lighting conditions, the fruit quality will be good, and the flower buds formed will be also increased significantly. [...]for dwarf dense planting orchards, the lighting conditions inside the crown must be good enough, and it should be no les than 3% of natural light[n].