Walnut trees do not bear fruit, can be solved through high-risk alternatives, and can produce good benefits. The main techniques for high grafting walnut trees are: Tree age selection Grafting walnut trees generally choose 5-15 years old, low dry, small crown, growing vigorous tree. At the same time, saplings below 30 cm in diameter and below can be replanted. If it is a weak tree, it is necessary to strengthen the management of the rejuvenation of the tree before grafting. Scissor scion Scion should be taken from the mid-segment or base segment of a fruiting tree with excellent varieties, robust growth, and no pests, with a diameter of 1 cm or more and a small and smooth pith. The ear cutting time is appropriate after falling to mid-February. Each scion retains 3 full shoots, is sealed with paraffin, 50 or 100 varieties are tied, wetted with wet sand or wet sawdust, thickness 15-20 cm, and stored at a temperature of about 10 degrees Celsius . The time for the grafting walnuts to be grafted for a suitable period of time should generally be controlled when the buds sprout or the leaves begin to bloom. Injury flow control saw the joints in the original tree crown affiliation 7 days before grafting. The saw head should be 20-30 cm from the base. At the same time, at the base of the trunk 20-30 cm from the ground, spiral drilling 2-3 mouth, the depth of the main stem diameter of one-fifth to one-seventh, in order to facilitate the flow out of injury. If there is too much injury, you can also saw 1-2 wound mouths at the base of the joint. Grafting techniques Plug the skin. The scion is not peeled, and the rootstock interface diameter 3-12 cm is mainly used this method. Plug the tongue to connect. Scion peeling, the diameter of the rootstock interface 3-12 cm mainly use this method. When grafting, the rootstock is sawn again to dry layer, then the rootstock outer surface is cut off with a long tongue. The scion cuts and grows 5-6cm tongue-type noodles, and squeezes off the cortex and xylem of the tongue part by hand, and then the xylem tongue part Insert the between the cortex and the xylem on the side of the rootstock section, and apply the lingual skin layer of the scion on the tongue-shaped noodles of the rootstock skin. Finally, tightly bind it with a plastic tie. Double tongue connection. Rootstock interface diameter of 3 cm or less. Embed the nailing method. The rootstock is too thick and the bast is too thick to be grafted by this method. After wound protection, the scion shall be fixed and the interface shall be moisturized. Usually the grafting interface and the scion shall be covered with grafting tape, wax or plastic bag. The plastic bag shall be 4-5 cm higher than the top of the scion and the gas shall be removed to facilitate scion. Germinating shoots. Use a newspaper cover over and around the plastic bag to facilitate moisturizing and moisturizing the shade and promote wound healing. After management After the grafting, the scion begins to sprout, and the branching leaves are observed every 2-3 days. For the leaflets, a small opening can be made on the upper end of the plastic bag so that the tip of the tender shoot can stick out. The upper air outlet is small to large and cannot be opened at one time. It is also not possible to remove the plastic bag too soon. In addition to sprouting timely removal of the sprouting branches of rootstock, if the joint is not alive, can retain 2-3 germination branches in the appropriate parts, and later make up. 25-30 days after anti-folding, the scions germinate one after another and grow rapidly. When the scion is a little longer than 30 centimeters, it is necessary to set up the pillar at the interface in time, tie the new lightly to the pillar, and cut out the sprout on the stem at any time, and tie it 2-3 times longer with the new extension. . Supplementary grafts that do not survive, should be selected in the appropriate position, occur on the anvil pile buds and stay 2-3, in July-August budding. After loosening the graft for 2-3 months, loosen the interface binding material once, but do not remove it. After the end of August can be removed according to circumstances. Pruning high-risk walnut trees is easy to form plexiform branches, pruning should be combined with short cuts, rapid expansion of the crown as soon as possible, and to strengthen fertilizer and water management and pest control, make it effective as soon as possible.
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What to do if the walnut tree does not hang