Pruning of walnuts is carried out after harvest and before leaves turn yellow (from mid-September to165438+1early October). Pruning at this stage will reduce the leaf area and affect the nutrient accumulation of the tree, which is suitable for adjusting the skeleton structure of the tree. At the same time, because the leaves haven't fallen, it is easy to distinguish the over-dense branches from the shade branches, which is beneficial to ventilation and light transmission, and there will be no flow injury at this time.

Pruning technology of walnut:

1. Pruning of main branches: In order to control the height of the fruit tree, the top three-pronged branch can be used to gradually lower the head, and the top main branch can replace the tree head, so that the height of the tree can be controlled at about 6 meters. Therefore, the trunks at all levels of the tree are constantly extending, and the crown is also expanding. Therefore, it is still necessary to cultivate a solid and gradually extending skeleton, control the back branches in time, and take back the drooping branches to replace the original ones to maintain the growth of branches. If the extended branches droop, you can pick their heads with inclined branches to rejuvenate them.

2. Pruning of surrounding branches: The branches, cross branches and overlapping branches that are too dense outside the crown should be thinned or retracted in time. For some weak branches with insufficient illumination and more consumption than accumulation, they should be thinned out in time to meet the requirements of evacuation of peripheral branches and non-empty lumen.

3. Pruning of fruiting branches: For walnut trees that enter fruiting, the fruiting branches should be selected and cultivated in a planned way.

4. The transformation of auxiliary branches can be gradually transformed into large or medium-sized branches by shrinking or shortening according to the space occupied and the distance from the surrounding main branches.

5. With the strong developing branches, the strong branches born in the middle or outside of the main and lateral branches can be removed, the strong branches can be removed, and the straight branches can be left flat, and the remaining developing branches can be gradually transformed into middle branches or branchlets.

6. Control the long branches, and control the use of long branches in the inner room. Under the condition of not affecting ventilation and light transmission, the living parts are suitable. Generally, the head is longer, and it retracts at the weaker branches in the second year, and it is cultivated into smaller fruiting branches. The spacing between branches should be 60- 100 cm to facilitate ventilation and light transmission. For aging branches, they should be retracted and rejuvenated in time.