The pruning period of fruit trees is generally considered to be mainly divided into dormant pruning (winter pruning) and growing pruning (summer pruning). In fact, it is not. Fruit trees are pruned before or after flowering in spring, and growers are called spring shears. Spring shear is based on the winter cut, in order to compensate for a lack of winter shear a partial postponed pruning. Practice has proved that if spring shear is used properly, it can regulate growth and results in time, promote flower bud differentiation (on deciduous fruit trees), promote the occurrence of resultant mother branches, increase fruit set, promote young fruit development, reasonably utilize tree nutrients, and maintain trees. Nutrient balance, to overcome the large and small fruit trees, ease the growth of young trees and promote multiple branches, is conducive to controlling the crown, cultivating branches and other groups have a significant effect. First, the complex shearing time After the temperature rises and stabilizes, the sprouts of fruit trees can be clearly identified when they are buds and flower buds, and they are sheared off before the bud expansion period. Second, the complex shear sequence must be trimmed according to the conditions of the orchard, tree age, tree vigor and frost damage degree to determine the level of pruning, generally first cut into mature trees, after the shearing of young trees; first cut weak trees and early flowering varieties, after cutting Wang tree and late flowering varieties. First cut the frostbite shoots, dead branches, and pests and branches, and then prune from top to bottom from the periphery to the innermost part. Third, the complex cutting method 1, the full fruit period of fruit trees, first leaves full of flower buds and more, according to the growth of branches and the results of the branch ratio of 3:1 to adjust, the results of the mother branch twigs trimmed to make a reasonable result , Reasonable load. Appropriately retracting the canopy, strengthening the ventilation and light transmission within the canopy, mainly sparsely shearing, supplemented by short cuts, thus playing the role of strong flowers and fruits. 2. For older trees with more flower buds, we should keep weak and keep weak, renew the old and dense branches, and appropriately short middle and long fruit branches. Sparsely cut cross-section trees and other weak branches in the upper and middle of the crown. 3. To spend as little as possible on the young tree to stay as many as possible flower buds, sparse dense nutrition. 4. In addition to the normal short cuts, the branches of the young trees may be long-distributed, but they may also be appropriately short-cut to facilitate the development of shoots. At the same time, excessive dense growth branches and leggy branches should be eliminated, and the main lateral branches of the sapling tree can be drawn and shaped to lay a foundation for high yields. 5. For the frozen fruit trees, we should master the principles of “small injury, picking the leaves, slashing and pruning, and severe injury, sawing and leveling†and carry out reasonable spring shearing. After the frozen shoots are still good, the leaves do not dry, they should be removed as soon as possible; for some frozen frozen shoots, the dead shoots should be cut off, and the freeze is severe. If the entire canopy freezes, the trunk should be cut off. Cultivate 2-3 growing branches to become the backbone branches. Fourth, pay attention to matters 1, complex shear must be combined with good fertilizer management in order to receive good results. Can be combined with Shichun fertilizer appropriate to the rapid increase in nitrogen fertilizer-based fertilizer. Alternatively, the crown can be applied by top dressing (spray 0.2% potassium dihydrogen phosphate plus 0.3% urea solution). 2. The mountain orchards should pay attention to drought prevention and drought relief. 3. Pay attention to the protection of lychee twigs. Generally, only the pods of the inner pods are dropped and the fruit branches are short-cut to promote their robustness. 4. Excessive pruning will severely impair the growth of the root system, causing rapid decline of tree vigor and must be prevented. 5, pay attention to protect the wound and strengthen the prevention and control of pests and diseases.