The key to the pruning of the chestnut planted plant in the early Fengyuan Garden is to control the expansion of the tree crown. This is a new pruning technique, and its application in production is very good. To throw away the long handles of the past, use pruning shears to trim. The specific technical points are:
First, use low-cut dwarf-crown plastics, with natural happy-shape or delayed happy-shape. Dry height 30 to 50 centimeters, delayed full-fledged tree trunk no more than 5 to 6; base stay three main branches, leaving two layers at intervals of 1.5 meters, two branches generally stay two. There may be some small auxiliary branches between the layers, which are clearly structured. Tree height is controlled within 3.5 meters. Before sprouting in the spring each year, the main branch corners are opened to about 65 degrees, and the auxiliary branches are opened to 80 degrees. For the one-year strong shoots on the newly grafted tree, the second to fifth shoots under the cuttings were budded before germination, that is, 0.1 cm above the shoot to injure the cortex to mitigate the apical dominance and prevent the lack of shoots.
Second, 1 to 3 years after grafting, the tree vigor yields low yield, and pruning is mainly based on summer topping. Topping the heart 2 or 3 times a year: For the first time at the end of May, extend the branch to 30 to 40 centimeters and pick up the heart. This time, the heart should be weighed to promote branching; other branches can be 6-8 buds, and can be removed at the same time. The top 2 leaves (leaf petiole) trigger new shoots. The second and third pickings were from the end of June to August, respectively. The picking of the hearts instead of the winter cut was short, and the picking objects were unsealed twigs and fruiting branches that were too long. Winter cuts are mainly used to eliminate dense branches and weak pests and branches.
Thirdly, in the fourth year after grafting, the tree vigor has eased, the yield has increased, and grafted varieties have mostly been the result of suitable short-cut varieties for the mother twigs. Pruning is mainly from summer shearing to winter shearing. During winter cutting, fine and weak branches and over-closed parallel branches and branches were cut out, and the long and short pruning method was appropriately applied to the remaining middle and long branches. For example, the strongest branch with 3 or more branches on the top of the mother tree leaves 5 to 6 buds to cut off and promote new shoots; on the middle and strong branches, it cuts off the result area; the mean tree branches are light or not. There are two effective branches at the top, strong cuts in the middle, strong cuts in the light cuts. Shortcuts must have more than 3 full shoots under clipping. For four-finger branches and five-palate branches, one to two strong branches can be sparsed, and the remaining branches can be treated as three litchi.
4. After 2 to 3 years into the full fruit period, the tree vigor further weakens, and the crown is easy to bald. At this time, the branches of various levels are replaced by minor rotations and trimming. One-third of the annual backbone branches are retracted. Retracting branches should be selected cross-branches, overlapping branches and light leg branches, so that the backbone branches staggered up and down, there are stretched and contracted to maintain a robust tree, three-dimensional results, then pruning also control the amount of mother branches, generally grasped in each square meter 8 to 10 are suitable. Http://Content/681aeff9-b3c6-4e3a-853e-805c3f34241d?cType=2
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