Pruning walnut trees in autumn is an important technical measure to cultivate early-bearing walnut trees. While carry out soil, fertilizer and wat management and pest control, reasonable pruning of walnut trees is beneficial to realize that goal of high quality, high yield and stable yield of walnut trees. Some key points of pruning are as follows:

1. Pruning period and main tasks: after harvesting walnuts, before the 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. Autumn pruning is mainly to remove over-dense branches and shade branches; Retract the drooping branches; Adjust the skeleton structure of the tree. In addition, pruning in autumn promotes strength and is suitable for pruning weak trees, old trees and walnut trees on the hillside. At this time, it can move the big branches smoothly without injury.

Second, pruning method: thinning dense branches and processing low branches. Early fruiting walnut has many branches, which is easy to cause many branches in the crown and high density, which is not conducive to ventilation and light transmission. In this regard, according to the principle of weakening and retaining strength, the branches that are too dense should be thinned in time. The specific method is: close to the base of the branch, cut it off, and stick the anti-corrosion film of the corpus callosum in time, and don't leave any branches, so as to facilitate wound healing. Most of the back branches are planted on the back of the tip of the mother branch, which germinates early in spring, grows vigorously and has strong competitiveness, which is easy to weaken the original branch, causing the phenomenon of "reverse pulling" and even causing the death of the original branch. Its treatment method: cut it off after germination or at the early stage of branch elongation. If the original mother branch is weak or the branching angle is too small, the original branch can be replaced by the lower branch or inclined upper branch on the back, and the original branch can be cut off or cultivated into a bearing branch group. If the growth potential of the lower branches of the back is moderate and mixed buds have been formed, the results can be retained. If the lower branches at the back grow vigorously, they can be retracted at the appropriate branches after fruiting and cultured into small fruiting branches.