After the walnut enters the senescence period, the outer branches grow weakened and sag, and the large and medium branches die. At this time, if the time is updated and rejuvenated, the result years can be extended. Update sub-large, medium and small updates. The big update is also called the trunk update, that is, the walnut tree with higher trunk and weaker tree is sawn off from the appropriate part of the trunk; the medium update is also called the trunk update, and the appropriate part of the main branch is sawn off; Called the side branch update, the side branch is retracted. The update and rejuvenation should be flexibly controlled according to the tree trend. After the update, the amount of hair should be increased. You should choose to keep the branch and cultivate the tree.

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