(1) The scion is selected from the mid-periphery of the canopy of the elite parent plant, reddish-brown epidermis, full-grown, and 1-2 year-old spring and summer shoots for the scion, especially the mid-section of the top branch with white hair on the leaves. As well. The results from Gaotian, Putian, Fujian Province showed that the scion with a thickness of 1.0-1.5 cm was thick and full of 1-2 year-old shoots, and then healed quickly after being harvested. The survival rate was high, and the ability to pull shoots was strong.

(2) During the period of 2-3 months (in Putian, Fujian Province), it was the most suitable period. At this time, when the spring shoots germinate, the temperature rises and the sap flow is large, which is conducive to wound healing and high survival rate. The method of picking up the buds is also the bud bonding and the like in autumn.

The most suitable period for high-yielding and high-intensity planting is the high survival rate implemented in spring after the buds have been picked. At this time, the spring shoots are at the pumping stage, and then the growing shoots can form flower spikes. Therefore, experienced fruit farmers tend to make higher returns during this period. There are also some farmers who are afraid of affecting the income of the current year, and they will be picked up in mid-June after harvest and the survival rate is also good. However, due to the consumption of nutrients in the trees after fruit harvesting, the temperature rises quickly and is different from the former by three months. Therefore, the summer shoots that survive after survival are relatively weak, and flower buds cannot be formed in the same year, and the bark has sun damage. The purpose of high-risk change is to change the species as soon as possible. Although the high pick-up in March affects the output of the current year, there may be some production in the second year. In June, the high pick-up was made. Although there was production in the year, the output in the second year did not affect the rate of change. Therefore, it is advisable to carry out the exchange in the spring.

(3) The number of high grafts in the whole tree, which is related to the high-response site (level). The higher the level, the higher the number of high grafts and the faster restoration of the canopy. However, the high grade, many joints, long nutrient transport distance, consume more on the way, the new shoots are weaker, the result is a high part, empty guilty, the effect is poor. On the contrary, the lower grades, fewer joints, and slower restoration of the crown, but the branch shoots are robust and strong. From the point of view of restoration of the tree canopy and yield, the proper lowering of the level is conducive to the sturdy and robust growth of branches and the regeneration of the crown. The specific number can be determined according to the age of the tree. For example, a 5-year-old tree can receive 3-5 heads, and a 10-year-old tree can receive 6-9 heads.

Each tree should be gradually completed in two or three years. Part of the tree is "pulled out of water" to avoid baldness of trees and bare branches caused by a complete tree. The bark is sunburned in the summer, causing other diseases and insect pests and lowering the survival rate. Retaining some of the large branches, the scion that was highly received in the past could not only play a part in the production of nutrients and shade, but also improve the survival rate, and there will be a part of the output. In the second year, these "pulled branches" of the previous year were further connected, and the survived branches that were high in the previous year became "pulled branches."

(4) Bandaging This is one of the key factors for the success or failure of high-risk exchanges. Different methods and materials for dressing have a great influence on the formation of callus after the pods have been picked up. In addition to binding the wounds of the cuttings and preventing the water from disintegrating, the protective measures such as adding kraft paper bags and black plastic bags are mainly to reduce the destruction of auxin at the interface by ultraviolet rays in the sun and promote the formation of callus. Cai Zongqi (1990) in Putian, Fujian Province, showed that the film was used for full closure and then put on a brown paper bag. The callus was formed within 5-10 days. The survival rate was 96%, and the amount of growth was large. With the mulching of plastic film or film strips, the callus formation takes more than 15 days, and the survival rate and growth volume are not as good as those of the dressing film and the kraft paper bag.

The protection of moisturizing the interface after high contact is directly related to the survival rate of grafting. Bonding the interface with 1-2 cm wide plastic is a widely used method. It has fixed scion and moisturizing and double action. The tie must be tight and there should be no trace of the wound in the cut of the anvil. It can also be moisturized with plastic bags. This method can be divided into open and closed type, containing fresh moisturizing materials such as sawdust or fine soil. After opening the leaf, the sealed plastic bag should be ventilated in time, and then completely remove the moisturizer after survival.

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