Walnut has many tree shapes, which are commonly used: evacuation layered shape and natural happy shape.
Evacuation stratification
The tree has an obvious central trunk with 5-7 main branches, which are planted on the central trunk in 2-3 layers. The formed crown is semicircular, with good ventilation and light transmission, long service life, high yield and heavy load. Suitable for site conditions.
1, fixed drying:
Fixed stem is a plastic band that specifies the height of the trunk and the first layer of main branches. Walnut 1 bears fruit early and has a small tree body, which belongs to dwarfing. The height of the fixed pole is generally 0.8- 1.2m ... After a fixed value, when the young tree reaches the required height, it can be fixed; If you can't reach the fixed stem height (it is generally recommended to fix the stem in the second year, according to the growth of young seedlings, or in the first year with good growth), you can prune it repeatedly to promote strong branches. Cut it dry, cut it diagonally and then color it.
2, plastic surgery process
1) In the first year or the second year, above the height of the trunk, select three branches that grow vigorously in different directions (the horizontal angle is about 120) as the first layer of main branches. One-time selection with many branches; Those with poor growth potential and few branches will be chosen to keep after two years. Within the layer, the spacing of main branches is not less than 20cm, and the opening angle of main branches is 60. Select the vertical strong branch as the central branch at the top of the crown (the distance in the layer must be controlled when selecting and staying, too small will weaken the growth potential of the central main stem).
2) When Guanhe 1 walnut is 4-5 years old, if the distance between the first and second layers of main branches is more than 60cm, and there are strong branches, you can choose to leave the second layer of main branches, generally 2-3. At the same time, select and leave side branches on the first layer of main branches, and select and leave side branches on the same side and at the same level to avoid overlapping.
3) When walnut 1 is 5-6 years old, continue to cultivate the first layer of main branches and lateral branches, choose to keep the second layer of main branches and the third layer of main branches, and generally keep 1-2 main branches in the third layer. The main branch spacing between the first and third floors is about1.2-1.5 mm. If only two main branches are left, the main branch spacing between the first and second floors should be increased. If three layers of main branches are left, the spacing between the second and third layers of main branches is the same as that between the first and second layers. The evacuated layered skeleton is basically formed.
In the process of selecting, retaining and cultivating main and lateral branches, we should control and make good use of secondary branches, accelerate the formation of fruiting branches and prevent the fruiting parts from moving out. Prevent useless branches from interfering with the tree.
Sparse layer tree legend
Natural happy shape
Trees generally have 2-4 main branches and no central trunk. It has the characteristics of quick forming, early effect, easy forming and easy mastering. Suitable for harsh site conditions.
1, Ding Gan
The height of the fixed pole is 0.8- 1m, and the method of fixing the pole is the same as the shape of the evacuation layer.
2, plastic surgery process
1)2-3 years, choose 2-4 branches or germinated strong buds as the main branches of the plastic surgery area. The spacing between main branches is 20-40 cm. The main branch can be selected once or twice. The growth of each main branch should be close, and the opening angle should be about 60 to maintain the balance of growth.
2) Walnut 1 is 3-4 years old. After the main branch is selected, the first-level side branch is left. Because there are few main branches in the happiness tree, it is necessary to leave more side branches appropriately. The lateral branches on each main branch should be scattered up and down and evenly distributed.
3) When Guanhe 1 is 4-5 years old, 1-2 secondary lateral branches are selected from the primary lateral branches. The skeleton of a happy tree is basically formed.
Happy tree legend
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