After young trees are planted, they begin to bear fruit in 4 ~ 5 years, mainly with short fruit branches, which have the characteristics of advanced secondary branches.
When planting in fertile soil, the pruning is a little heavy, the total branches and short branches are insufficient, the young trees are easy to delay fruiting, and the big trees are not easy to yield.
After fruiting, only 1 fruiting branches were produced, and a few 2 branches were weak, making it difficult to form short fruiting branches. The elongation and branching ability of medium-long branches and medium-long fruit branches are relatively strong, and the top continues to extend, and short fruit branches can still be formed behind them, but the short fruit branches have weak continuous fruit-bearing ability, long fruit-bearing life and are not resistant to pruning. The germination ability of cryptobuds is low, and the regeneration ability of branches is weak.
When modeling young trees, it is more appropriate to choose sparse trunk shape or natural shape with many main branches. Young trees have shorter new shoots and more branches, and the extended branches of the backbone branches should be lightly cut and left long, usually in the middle and upper parts of summer shoots, so as to quickly expand the crown and reduce the branch density.
Beijing Pak Lei, cultivated on fertile plains, can retain more main branches and auxiliary branches during the young tree period, and the long branches can be thinned less and released slowly, so as to slow down the vegetative growth and promote early fruit. If there are too many main branches, they can be treated step by step after the full fruit period.
When pruning young trees, leave more auxiliary branches. If the growth quantity and growth potential of auxiliary branches are not stronger than those of nearby main branches, they can be thrown away without cutting to promote their flowering and fruiting. If the growth amount and growth potential are stronger than the nearby main branches, the growth amount and growth potential can be weakened by measures such as bare branches, pulling branches or shrinking branches.
Beijing and Pak Lei still have the characteristics of multiple branches and high-level secondary branches after entering the full fruit stage. The trunk branches or auxiliary branches left over from the young tree period should be treated by stages in each batch; Branchlets or short fruit branches are not resistant to pruning and generally can not be pruned; If it is too long, it can be retracted where there are strong branches. For the developing branches on both sides of the main branches, except the extended branches, the middle branches and the medium-long fruit branches on them can also be left uncut and allowed to grow naturally and branch and bear fruit.
When the close planting of the outer branches of the crown affects the light conditions in the crown, the close planting of the outer branches can be properly removed.
For the pruning of Pak Lei, the pruning methods of frequent pruning of big branches and slow release of small branches or no pruning can be adopted, which will give full play to the characteristics of senior secondary branches in Beijing and Pak Lei and be beneficial to early flowering and early fruiting.