First, the pruning period
There is a phenomenon of injury in the walnut tree, which is not suitable for pruning. It is most suitable for autumn pruning. The saplings have no fruit. They can be pruned in advance from the end of August. The adult trees are around October before the fruit picking and the leaves have not turned yellow.
Second, sapling
The advantage of the top of the walnut tree bud is particularly obvious, and it is suitable to adopt the trunk sparse layer shape, and it is easy to shape. In the year of planting, no trimming is carried out, only the main stem is straightened, and the top bud is protected. After the spring germination, the top bud will grow upright, and it will be used as the center. The lower part of the top bud will be evenly distributed and grown in 5–6 months. The exuberant 3–4 side branches are used to grow the second main branch, the second layer retains 2–3 main branches, and the remaining 1–2 main branches are 50–70 cm away from the second layer. In 1–4 years, the main branches do not need to be trimmed to naturally divide the lateral branches and enlarge the canopy. It is usually formed in 3–4 years, and the height of the tree is about 3–5 meters.
Third, the result tree pruning
Walnut trees enter the peak period of the results, and should always pay attention to the use of auxiliary branches and long branches in the pruning, cultivate a good branch group, and timely deal with the back branches and drooping branches.
From the beginning of the results, the result area will be continuously increased, the result area will be enlarged, and the fruiting period will be entered. The cultivation and rejuvenation of the branch group should be strengthened. The cultivation branch group can adopt the main method of pruning "first release and then retract" and "removed branches, leaving oblique branches and back branches". The long branches are generally not left in the early stage of the results, and can be converted into branch groups during the fruiting period. The branches on the back should be controlled in time to avoid affecting the backbone branches and the resulting mother branches. The drooping branches are cut off in time. For the trimming mouth, the callus and anti-corrosion film should be applied in time to protect the wound tissue from healing, and the whole garden should be disinfected and disinfected by the general manager to reduce the source of the bacteria.
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