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 grafting of walnut trees can avoid these 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. To use stout rootstocks and grow full, pith branchlets do scion.
Grafting process must master the "character" in order to improve the graft survival rate, "character" is: 蘸, release, fast, flat, accurate, tight, wrapped, set. “蘸†will soon be scooped into liquid paraffin at 95°C and quickly dip, so that the surface covered with a layer of uniform thickness of paraffin; "release" is 1-2 days before grafting with a knife to the rootstock seedlings 60 cm away from the ground A ring cut, low "drain" to ensure that the grafted part of the upper part of the healing; "fast" refers to the cutting scion, rootstock faster; "flat" refers to the cutting surface should be flat; "quasi" is the rootstock and scion formation layer to be right Quasi; "tight" is the use of plastic strips tied tightly around the joints of the scion and the rootstock; "wrapped" is the tightly wrapped joints, and then wrapped in two layers of newspapers; "set" refers to the final use of appropriate plastic bags will be grafted Good location is good.
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