Walnut sapling "shushu" shear

1. During the pruning period, walnuts are different from other fruit trees. In the dormant period, branches are damaged due to pruning, breaking, etc. The sap in the tree body will flow out from the wound to cause loss of nutrients; light causes the tree vigor to be weak, and the severe causes the branches to dry or The strain died. Therefore, walnut trees cannot be trimmed during dormancy.
The best time for the pruning of walnut trees is before the leaves turn yellow after harvest, that is, “white dew” in mid-September to “cold dew” in early October. Trimming does not occur at this time, and the wound heals quickly. Because there is no fruit, saplings can be advanced to the "summer heat" in late August.
Second, the purpose of walnut tree saplings, generally grow quickly, natural growth is often difficult to become a tree with a certain structure, especially early walnut varieties (Yuan Fung, etc.), due to the early results and the second branch interference, more difficult to form Good crown shape. In order to cultivate a solid crown skeleton and high yield tree shape, effectively control the rational allocation of the main and lateral branches in the space, improve lighting conditions, improve the reasonable leaf area index, and promote the early and high yield of young trees. In the cultivation and management of the walnut garden, we must grasp Good sapling pruning.
Third, the branches processing 1, back branches: 1 All born in the first layer of the main branch, the back branches, the emergence of "inverted pull" phenomenon, and affect the development of the branches, should be cut off from the base; 2 from the tree crown On the upper and upper branches and branches, the descending branch can be selected according to the angle of the opening angle of the main and lateral branches. When the opening angle is large, it should be cut off; when the opening angle is small, the lower branch can be used instead of the original branch to expand the branch. angle. For the presence of sagging or extending too long, as if the whip, you can leave a short cut of 30 cm to 40 cm. When the reserved branches are overgrown, they are picked up in the late summer and early fall, or retracted in the spring of the following year, and some side branches are removed to ease the growth. 2, leggy branches: As early as walnut varieties, more branches, coupled with excessive consumption of bone branch nutrient, resulting in apex shrinkage. In such cases, the buds are susceptible to irritation and pull out leggy shoots. Although this kind of leggy branches can be planted in the second year, and the number of branches resulting from the pumping results is as many as 10 to 20 or more, due to the large amount of nutrient consumption, more than half of the resulting branches cannot form mixed shoots, and they appear. A long band of baldness. A short cut method can be used to treat leggy branches. According to the length of leggy branches, cut from 1/3 to 1/2, leave 2 to 3 branches after hair branch. 3, the second branch: the second branch occurred in early walnuts, due to the late branches, growing vigorously, the organization is not full, susceptible to freeze damage and shrinkage; at the same time let it grow, it will seriously interfere with the tree. Treatment methods include: removing, picking up, cutting short (usually 1/4 to 1/2 of the original length), removing weak strengths (where more than 2 secondary branches are drawn, leaving a healthy one, More than cut off). 4, useless branches; mainly refers to dry and dead branches, pests and branches, over dense branches, overlapping branches, thin branches and other timely removal.

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