Chestnut Shaping

Chestnut Shaping

Chestnut is a kind of perennial special economic tree species with wide adaptability and high economic efficiency. But at present, some new and old chestnut planters have not mastered the technique of plastic trimming of chestnut trees, resulting in disordered chestnut trees and affecting the early formation of chestnuts. Early results and increased production. Now we will introduce chestnut pruning technology as follows. 1. Chestnut tree shape In recent years, chestnut varieties newly planted include Maobanhong, Lili, Jiande 3, and Yunshi No. 1 and so on. Generally, there are about 50 per planted chestnuts, and the planting density is relatively large. For the chestnut plantation with high planting density, the height of the canopy should be controlled early in the plastic surgery to make the tree ventilated and breathable, so that the crowns are compact, the branches are full, robust, and normal. At present, chestnut shaping uses a double-layered no-delay open heart shape. The tree shape is fixed at 60 cm, the height of the tree is 2.5-3 meters, the diameter of the crown is about 3 meters, the main branch of the first layer is 3-5, the distance within the layer is 25-30 centimeters, and the main branch opening angle is 45 degrees; The second main branch 6-8, distance 40 cm, the upper and lower two layers of 60 cm. The first 3 branches of the main branch left 2-3 lateral branches, the first lateral branch from the trunk 30-40 cm, the second lateral branch from the first lateral branch 30 cm, cultured in the opposite of the first lateral branch, the second main branch is not Leave medial branches and culture the resulting shoots on the branches. 2, different ages of chestnut tree pruning 2.1 adult grafting tree pruning. After the chestnut grafting, the latent buds on the rootstock are stimulated to sprout, and they should be wiped off in time. This will not only save nutrients, but also promote the sprouting of buds. The updated chestnut tree leaves 3-5 robust branches in each sawed branch. When the new shoot grows to 25-30 cm, the tip of the apex is removed, the secondary branch growth is promoted, and the graded branch growth is increased. Crown. After the grafting, the chestnut tree resumes its growth and can be restored to the original canopy 1-3 years later and the results begin. 2.2 The trimming of the result tree. As a result, the trophic growth trend of the tree has eased, and the production has increased year by year, reaching a peak period. If it is poorly managed, it is prone to large-scale and annual results. To this end, the pruning task in this period is to trim the height of the tree branches, adjust the density of shoots, improve the light conditions, prevent canopy closure, and cultivate stout branches so that the results can be achieved both inside and outside the tree. The weak branches should be updated and rejuvenated in time, and the tree-shaped structure should be the mainstay for the chestnut trees that have been left uncut for many years. Jackets with an excessively high tree crown should be promptly dropped. For dense branches, they should be selected to stay outside the main branch of 5-6. Others should be removed in batches in stages. The principle of pruning is "fine pruning, every branch must be between weak and strong." Take full advantage of cultivating peripheral results. 2.3 Pruning of aging trees. The nutrient growth of chestnut trees that have been planted for many years or lost is debilitated. If the management is poor, the pests and diseases will be heavy. The growth of new shoots will be less than 15 cm. The tree branches will die, and only some new branches outside the canopy will bloom, but the flowers will fall seriously and the fruit setting rate will be high. low. The pruning of these chestnut trees should be promptly rejuvenated to cultivate the stem branches and result in new branches. By cultivating a robust mother tree, vegetative growth is promoted, tree vigor is restored, and the result is extended. Update method: When the winter shears, all the weak branches and branches will be updated. Generally, they will be sawn according to the requirements of the tree shape and height, and the kerf thickness will exceed 8 cm. After the saw, it is treated with drugs in time to prevent infection. The length of the winter cuts must be alternated, and the level must not be shaved. When sawing branches, care should be taken not to injure the remaining bark, and the plastic sawdust should be used to tie the sawed cut after the pruning, so as to prevent sun cracking and affect healing.

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