1. Trim time. After the fruit is harvested in the autumn and before the leaves are yellowed, it cannot be trimmed one month after the defoliation and before the budding. These two periods are the peaks of the wound flow.
2. Walnut tree shape. A reasonable tree shape is the basis of high yield. The natural happy shape is mostly used for small and medium crowns and early solid planting gardens; the trunk sparse layer shapes are mostly used for sparsely planted trees, scattered trees, and intercropping trees.
3. Trim. Pruning at this stage will reduce the leaf area and affect the nutrient accumulation of the tree body. At this time, the tree body is free from injurious flow and is suitable for adjusting the skeleton structure of the tree, mainly pruning large branches, eliminating dense branches, pests and branches, and shading branches. Behind the branches, retracting drooping branches. Other prunings should wait until the second year before budding.
4. The renewal and rejuvenation of aging trees. After the walnut enters the aging period, peripheral branches grow weaker, droop, and large and middle branches die. At this time, if the rejuvenation is updated in time, the result can be extended. Update the big update, medium update, and small update. The big update is also called the trunk update, which means that the tree trunk with a taller trunk and a weaker tree is sawn from the appropriate part of the trunk; the medium update is also called the trunk update, which means that the appropriate part of the main branch is sawn off; the small update is also Call the collateral update, that is, retract the collateral. The rejuvenation should be based on the tree potential, and there should be more post-updates.
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