Walnut older seedling tree multi-head grafting optimization technology

Abstract

The invention discloses a walnut older seedling tree multi-head grafting optimization technology which is completed by three steps of: 1, carrying out heavy retraction on main branches and lateral branches in spring to stimulate germinated exuberant new branches; 2, carrying out multi-branch multi-site bud grafting on the new branches from the end of May to the middle ten days of June; and 3, enhancing management and protection after grafting and facilitating early recovery of tree forms and tree vigor. Compared to conventional walnut older seedling tree variety grafting optimization which adopts trunk cutting hard grafting and main branch hard grafting, the method disclosed by the invention has the advantages of small open wounds, low nutrition and water loss, easiness for healing of fracture positions, small damage to tree bodies and the tree vigor, firmness for healing and growth of grafted positions, capability of rapidly recovering the tree forms and the tree vigor and capabilityof recovering yield to over 120kg in the next year after grafting. The technology is simple in method, matured and easy to learn, a survival rate is highly ensured, the tree forms are easy to rapidlyculture and form, the yield can be rapidly recovered, and the technology is easy to accept by the masses. With respect to older seedling tree hard branch grafting optimization, the method is easier for common fruit farmers to learn and master and suitable to popularize and apply in a large scale in field walnut hybrid tree grafting optimization.

Description

technical field [0001] The invention relates to the technical field of methods for planting and cultivating economic crops, in particular to methods for improving and cultivating large walnut tree varieties. Background technique [0002] Walnut belongs to Angiosperm, Dicotyledoneae, Juglandaceae, and Juglans. It is a tall deciduous tree native to the Near East. It is also called walnut and Qiang peach. Candies, etc. are not only delicious, but also have high nutritional value. They are known as "Longevity Fruit" and "Longevity Fruit". Together with almonds, cashew nuts and hazelnuts, they are also known as the world-renowned "Four Great Dried Fruits". [0003] Walnut is light-loving and drought-tolerant, but it is afraid of waterlogging and saline-alkali. It has strong resistance to diseases and insect pests, and can adapt to various climatic and environmental conditions and soil types. Walnut kernels are rich in nutrients, containing 15-20 grams of protein per hectogram, 6...

AI Technical Summary

Problems solved by technology

[0004] Because walnut belongs to the large-crown arborization tree species, the following problems are prone to occur in the process of improving the improved varieties of older seed trees and hybrid trees: one is that the whole plant dies after the grafting is caused by improper methods; the other is that the tree vigor is caused by improper methods. Damaged, even if the grafting is improved and survived, the growth will be poor in the later stage, resulting in the loss of economic production capacity; the third is that in the past, in the improvement of large walnut trees, the trunk or the main branch was used to cut off the hard branch: on the one hand, the tree body above the ground and the underground part The root system is seriously damaged, and the tree vigor is damaged; on the other hand, the grafting joint has a large wound, and rot is easy to infect, and the wound is difficult to heal for many years, or even if the surface is healed, the actual inner healing growth is not firm, and it is easy to break in extreme weather; In three aspects, the tree shape is difficult to cultivate and form, and it may not be able to form economic output in 3-5 years

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