Shortcut. The main function is to promote the growth of branches, improve the branching ability, change the extension direction and angle of branches, and promote the growth of local branches and fruit-bearing branches. Ginkgo branches are stout, and the heavier the short section, the thicker the new branches. Generally, under strong branch cutting, 2 ~ 3 new branches can be produced; After the weak branches are cut short, there are few or no branches. In order to change the position of main branch and lateral branch or change their extension direction, the terminal bud of short branch can be broken to promote the growth of branch.
Sparse branches. In order to cultivate the main branches and increase the distance between layers, the verticillate branches and adjacent branches should be properly thinned when pruning. When the long branches in the village can't be used, they should also be cut in time. When the length of the tree becomes weak and the outer branches are thin and dense, which affects the illumination in the inner room, some thin branches can be thinned out. Ginkgo trees have many short branches and few long branches, and the inner branches are easy to be crowded. It is necessary to cut off dead branches, aged branches, drooping branches and long upright branches in time, but it is not advisable to neglect too many other branches.
Shrinking young ginkgo trees needs to increase the amount of branches and leaves. Generally, it is not necessary to cut them. Old trees are often cut when they are updated. When shrinking and shearing, the backbone branches can also be retracted according to the affiliation, except for the base branches that are not fully aged. In order to prevent the cutting mouth from drying up and affect the germination of cutting mouth buds, about 5 cm more branches should be left on the cutting mouth. In order to change the extension direction of the top branch, increase or decrease the opening angle of the branch, and change the ventilation and light transmission conditions in the crown, branch contraction can be applied.
Scratch. In order to promote the germination of concealed buds, the upper part of buds is cut off in winter and germinated into branches in spring; Cutting off the lower part of flower buds in summer is beneficial to flower bud differentiation and also has the effect of balancing tree potential.
On the basis of winter pruning and summer pruning, the effect is more obvious.
The latent buds of Ginkgo biloba have strong vitality and long latent time. Even if it is a thousand-year-old tree, new branches often sprout from the base, trunk or main branch. When necessary, keep them for cultivation. When it is not needed, it should be erased in time before lignification, which is too late for thinning and consumes more nutrients, which is not good for healing.
The effect of bud removal is similar to that of bud wiping.
It is beneficial to blossom and bear fruit by girdling and sticking the skin upside down. The suitable time for girdling is from late June to late July. The girdling width should be110, and the branches should be thick, so it is better to heal in that year. Circumcision is too wide, it is not easy to heal, and it is also easy to be invaded by pathogenic insects. Don't gird your waist in the wind and rain, don't gird your waist on the trunk, and don't coat your waist with lime-sulfur mixture or Bordeaux solution. Girdling 1 time, valid for 2 ~ 3 years, and the effect is better on the basis of strengthening the comprehensive management of soil, fertilizer and water.
Sparse flowers and fruits. Ginkgo biloba has many short branches and strong continuous fruit-bearing ability. As long as the tree is in a normal state, it will bloom in large numbers every year. However, when there are too many flowers, too much load and the trees are undernourished, there will also be the phenomenon of bearing fruit in different years. Therefore, it is necessary to remove the excess flowers and fruits in time. Ginkgo biloba has a short flowering period and a small female flower organ, so it is not thinning flowers, but thinning fruits in production. But ginkgo trees are tall and difficult to dilute flowers and fruits, so some places try to dilute flowers and fruits with chemicals.