The young tree stage of walnut tree is from seedling planting to early fruiting. Early fruiting walnut for 5-6 years. The age of late-bearing walnut is about 1.5 years old. Walnut grows faster at a young age' If it is allowed to grow naturally, it is not easy to form a good tree with high yield structure. Through pruning, the rational distribution of main branches and lateral branches at all levels in the crown can be effectively controlled, and the yield and tree potential can be increased, laying a good foundation for high and stable yield in the future.

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Pruning young walnut trees is an important measure to continue to cultivate and maintain high-yield trees on the basis of plastic surgery. It can adjust the distribution of nutrients in trees and solve the contradiction between nutrient growth and fruit.

(1) Pruning contents and methods Because of the different growth and development characteristics of early fruiting population and late fruiting population at young age, the pruning methods are also different.

1) Early fruiting walnuts begin to bear fruit every two years, with strong branching ability, secondary branching and sprouting long branches. This is not the same as the importance of late bearing walnuts. Therefore, in addition to cultivating main branches and side branches, attention should also be paid to controlling secondary branches and making good use of long branches, thinning out over-dense branches and treating low branches.

Control the secondary branches, because the secondary branches germinate late, grow vigorously, and the tissues are not full, and it is easy to lose water in the northern winter, resulting in "shedding". If it is allowed to grow naturally, it can increase branches and yield, but it is easy to make the fruit part move out and interfere with the formation of good trees. The control methods of secondary branches mainly include: 1. Cutting off secondary branches. Cut the useless secondary branches from the base before lignification of the secondary branches. The pruning object is mainly the secondary branches that grow too fast and cause canopy. Second, eliminate redundant secondary branches. If more than three secondary branches are produced on one fruiting branch, 1 ~ 2 robust branches can be selected in the early stage, and the rest are thinned. If it grows too vigorously in summer, it can be controlled to extend outward by removing the core. Third, for a fruiting branch, only one secondary branch is produced, which grows vigorously and can be shortened in summer to make it branch.