The physiological basis of vegetative growth to reproductive growth is determined by the concentration of branch juice (nutritional concentration or hormone level). The higher the concentration, the more dominant the vegetative growth. Low concentration leads to reproductive growth. After the fruit tree is pulled, the top advantage is weakened, the germination ability is improved, and the distribution of nutrients and hormones is balanced, which is beneficial to the formation of flower buds. Pulling branches can also increase the angle of branches, improve lighting conditions and improve the photosynthetic efficiency of leaves. In apple pruning, many technical points were adopted, such as high stem, large branch pulling, light pruning, large angle, slow release, retraction, proper branch thinning, less short cutting and less scratching. However, since the subject is asking about pruning, let's focus on the angle of apple tree pruning first.
As a fruit grower in Yantai, I am glad to answer the question of the subject. Let me share my view on apple tree pruning. In fact, the angle of apple tree branches is not absolutely reasonable and unreasonable. We should choose the angle according to the tree shape, main branches and auxiliary branches. Generally, the best effect of apple tree branches is "spindle-shaped", that is, the best time to pull branches of "inverted pyramid" apple trees is within two years after transplanting.
The ideal angle between the apple tree lateral branch and the main technology is 60 degrees. The optimal horizontal angle between lateral branches is 120 degrees, and the optimal horizontal angle between lateral branches is 80 degrees. Spindle-shaped trees generally open at about 45 degrees, and the basic trunk is about 60 degrees. The branches on the back can generally be pulled down 90 degrees, and the branches that become flowers and fruits cannot be directly cut off. Some branches that are too dense can be disposed of.