The reasons for the low grafting survival rate of walnut trees are as follows: Firstly, the speed, quality and survival rate of callus formation are lower than those of other fruit trees, and the callus is rough; second, the content of tannins in trees and shoot buds is high, and air oxidation occurs. The formation of a dark brown isolation layer will affect the formation of callus; the third is the characteristics of wound flow, the performance of the dormant period is particularly prominent; Fourth, the branches are sturdy and curved, the leaf marks are protruding, and budding is difficult. Early spring on walnut branches can avoid the above problems. It can be started after the top buds of the rootstock seedlings spit green, and it takes 20-25 days until the young fruit grows. It is necessary to use stout rootstocks and full-grown, one-year-old or biennial-year-old shoots for scion to ensure that they have strong physiological functions. In order to improve the survival rate of grafting, the “eight-character 诀†must be mastered in the process of grafting: 蘸, ã€, å¿«, å¹³, quasi, tight, wrap, and sleeve. “蘸†is about to scoop into liquid paraffin at 95°C and dip quickly to make it covered with a layer of thick and even paraffin wax. The “discharge†was to cut the rootstock seedlings 60 cm away from the ground 1-2 days before grafting, and “low water†to ensure the healing of the upper grafted parts. "Fast" means that the speed of cutting scion and rootstock is faster. "Ping" means that the cutting surface must be flat. "Quasi" is the alignment of rootstock and scion formation layers. "Tight" is the use of plastic strips around the joints of the scion and the rootstock. “Wrapping†is to wrap the joint tightly, and then wrap the two layers of newspaper “jacket†means that the grafted part is finally covered with a suitable plastic bag. Pin And Lanyard ,Eas Steel Wire Lanyards,Stainless Steel Wire Loop,Double Hook Lanyard WENZHOU BOSHINE ELECTRONIC SECURITY CO.,LTD , https://www.cnboshine.com