The principle of replacement and pruning by rotation is to control the height of the tree crown and the speed of abduction, and it does not affect the yield and fruit quality while controlling the crown height. After the pruning, the branches were once outreached once a year for 3 to 4 years, and the trees were kept in a compact and compact tree structure; the original long barbed tree was cut into scissors to save manpower and material resources. Labor efficiency, extending the high yield and stable production period of dense planting gardens.
1. Both branches are updated with crown control (this technique is suitable for freshly grafted juvenile trees). The mother twigs were planted with 2 strong branches (greater than 0.6 cm in thickness), and they were truncated from the base of the shoots by 2 to 3 cm, using 1 mother branch. The short axillary buds have two preparatory branches, resulting in a leap year. In the following year, we retracted the branches of the previous year and cultivated the ready branches again. This way, we repeatedly updated the pruning and controlled the height of the tree and the expansion speed of the crown.
2. Multi-branch renewal of crown control (This technique is suitable for grafting more than ten years of full fruit period trees). Regardless of whether they are three-branched, four-branched, or five-palm, depending on the growth orientation, growth status, and tree space of the shoots, 2 to 3 strong branches are reserved, all mean trees and thin and weak branches are removed, 3 cm from the base of the branches. A 2-year-old mother branch is retracted and the preparation branch is raised. As a result of the coming year, the results of the previous year will be retracted again in the coming year. The sub-methods can be applied multiple times in order to maintain a compact tree structure, high light conditions, and a continuous increase in production technology.
3. Branches are updated with crown control pruning. Branches were renewed mainly for large fruit trees, with 1/3 branches retracted at 2 to 3 cm from the annual mark, group preparations were prepared; branches were used as a result; 2/3 branch results were used; As a result, one of the branches in the previous year was retracted again, the preparation branches were cultivated, and the last 1/3 branch group was retracted in the third year to continue to cultivate the preparation branches. In this way, the crown can be used alternately in different parts of the canopy, so that the height and speed of the canopy can be carried out slowly. The result of the chestnut is always on branches of 3 to 4 years old. The nutrients are transported nearby, with strong tree vigor, high yield and good quality.
4. Rotational trimming and trimming are combined with three grafts to allow branches inside and outside the canopy, resulting in up and down results. For trunks with large bare crowns, the lateral branches can use three non-grafting techniques to graft rod weights, leaving fewer branches at the top, cultivating the lower result branches, retracting the upper branches at any time, lowering the height of the tree, reducing nutrient transport consumption, and ensuring results The strong growth of branches, high yields and stable production for successive years.
5. Through the replacement of pruning by rotation, the high-yield period of dense planting chestnuts can be extended by 8 to 10 years.
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