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What are the measures to restrain the apical dominance and promote the lateral growth of crown?
In fruit tree management, we often hear people say the technical term "the highest advantage". This professional language may not be familiar to people who have just learned fruit tree management, but they probably know the meaning, but they just don't know how to use it. In fact, if we can deeply understand the "highest advantage" of fruit trees and skillfully use it, it will be very beneficial to the high yield and high quality of fruit trees.

So, what is the "highest advantage" of fruit trees? People who don't know much can simply think that this is the advantage of the end of the branch at the top of the fruit tree crown. This understanding is also correct, but it seems a bit simple. To understand this problem, we must first know the branches and buds of fruit trees. The yield of fruit trees depends on the number of flowers, seed setting rate and fruit quantity, which must be based on a certain number of branches.

Therefore, the quality of branches and leaves of fruit trees determines the yield of fruit trees. Therefore, managing the branches of fruit trees is equal to managing the yield, and managing the branches requires a correct understanding of the habits of fruit trees. Generally speaking, the basic habits of fruit branch buds mainly include heterogeneity, normal advantage, vertical advantage, germination ability, intelligence, dryness and hierarchy.

Peak dominance is the most important habit among the basic habits of fruit branches and buds. Mainly refers to the phenomenon that the buds near the top germinate and grow vigorously on the relatively upright branches, inhibiting the middle and lower buds. Generally speaking, when you see a branch sprout, the top bud will grow many long branches, only the short branch in the middle will sprout, and most of the lower branches will not germinate and become silver teeth. Therefore, the highest advantage of this branch has an important influence on the number, quality, composition, crown shape and tree potential balance of branches.

On fruit trees, if the highest advantage is strong, it will show something new and easier to grow. Annual branches will produce some growth branches, with low baldness or just some short branches. If the top of the fruit tree is dominant, it is not only not conducive to the formation of a good crown of the fruit tree, but also the fruit will sit late. Therefore, generally speaking, fruit trees with strong top advantages should be adjusted through plastic surgery.

The normal dominant habit of fruit trees is mainly due to the gradual difference of auxin between the top branch and the bottom bud. The uppermost bud first obtained cytokinin from the root, and then its auxin level increased, which inhibited the germination of lateral buds. Therefore, in order to adjust the advantage of the top, it is necessary to remove buds, apply auxin to the top, or change the angle of branches and rotate the upright branches into horizontal branches. Through such modification and shaping measures, the peak advantage can be adjusted, which can balance the power of fruit trees and make them better.