2. Cut outside and don't cut inside: the reason is the same as above. Under normal circumstances, the pruning of green leaves mostly cuts off the branches outside the crown, and only the dead branches, pests and diseases branches and severely weak branches are cut off in the inner room, and the normal green leaves are not cut off as far as possible to maintain the largest leaf area in the inner room.

3. Cutting strong but not weak: When thinning the peripheral branches in the middle and upper part of the crown, it is generally considered that the moderately weak branches should be cut off and the strong branches should be kept. Actually, this is not right. It is necessary to cut off the strong branches, keep the moderate branches, eliminate the strong and help the weak, control the excessive growth of nutrition, concentrate nutrition on the fruits of the moderate branches, and improve the yield. When thinning the strong branches, special attention should be paid to timely thinning the "riding" branches in the sky sprouting from the latent buds on the main side branches.

4. Cut and hang without warping: update the fruiting branches, fruiting mother branches and fruiting branch groups of the crown, cut off the weak and drooping branches, and keep all kinds of branches with growth potential, upward growth and warping on the fruiting branch group.

Extended data:

Distribution of pruning branches

1, big branches are few and sparse: big branches are main branches and auxiliary branches. The natural round head or happy shape cultivated by grafted seedlings should have three main branches, namely, big branches and few branches. If there are too many main branches, the main branches occupy less space, and the auxiliary main branches grow poorly, the main branches will compete for space growth, resulting in insufficient sunshine in the inner room, dead side branches and empty rooms. Therefore, the big branches (main branches) should not be left too much, but few and sparse, so that the auxiliary main branches have enough room for growth.

2. Many and dense branchlets: There are many branchlets (fruiting branches and fruiting mother branches), which should be distributed in all parts of main branches, auxiliary main branches and lateral branches. The so-called "more dense" is not dense without ventilation, but relatively dense with the main side branches. Only in this way can we ensure that the tree has enough fruit bits and high yield.

3. Clear subordination: refers to the clear growth relationship among the main branches, deputy main branches and side branches at all levels, and there is no competition and transcendence. Pruning should always maintain and protect this growth relationship between primary and secondary subordination, and the tree will bear normal fruit. Otherwise, the tree will grow abnormally, resulting in unclear primary and secondary, unclear subordinate, disturbing the tree shape and abnormal growth results.

4. Staggered and orderly: it means that the main branches, deputy main branches and lateral branches at all levels should be distributed in different directions, and the main branches at all levels should be distributed in an orderly and hierarchical manner, which is the basis of high-yield crown skeleton. Only by arranging large and small fruit branches on the main branches at all levels, occupying effective tree space, making full use of sunlight and exerting the photosynthetic efficiency of all leaves, can high yield be obtained.