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 the following seven aspects: Tree age selection Grafting walnut trees generally choose 5 to 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 cut from the mid-section or base section 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, which are sealed with paraffin wax and tied with 50 or 100 cultivars of the variety. They are immersed in wet sand or wet sawdust and have a thickness of 15 to 20 cm and are stored at a temperature of about 10°C. Grafting The time for high walnut varieties to be replaced should generally be controlled when the buds are sprouting or when the leaves begin to bloom. North China can usually be grafted from mid-April to mid-May. Injury flow control 7 days before grafting, saw the joints according to the original tree crown affiliation. The saw head should be 20-30 cm from the base. At the same time, at the base of the trunk 20 to 30 cm from the ground, spiral drilling 2 to 3 ports, 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, one or two wound ports may be sawed at the base of the joint. Grafting techniques The skin is not separated from the scion, and the diameter of the rootstock interface can be 3 to 12 cm. The skin tongue is connected to the ear and the skin is 3 to 12 cm in diameter. When grafting, the rootstock is sawn again to dry layer, and then the rootstock is cut off with a long tongue. The scion cuts and grows 5-6cm tongue-type noodles, and then squeezes off the cortex and xylem of the tongue, and then the tongue part of the xylem. 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. Two-toned rootstock interface diameter of 3 cm or less can be used this method. The rootstock of the tight spike method is too thick and the bast thick may be grafted by this method. Wound protection After the scion is fixed, the interface should be moisturized. Usually, grafting tapes, wax or plastic bags are used to trap the joints and scion. When the sleeves are placed, the plastic bag should be 4 to 5 centimeters higher than the top of the scion, and the gas should be excluded to facilitate scion germination. Tip. Use a newspaper cover over the plastic bag to tighten the lid so as to facilitate shading and moisturizing and promote wound healing. After management After the grafting, the scion begins to sprout, and the branching leaves are observed every 2 to 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 germination timely removal of rootstock shoots, such as joints do not live, can be retained in the appropriate parts of 2 to 3 germination branches, after the patch. 25 to 30 days after anti-folding, the scions germinate one after another and grow rapidly. When the scion shoots grow to about 30 centimeters, a pillar must be set up at the interface, and the new shoots should be lightly tied to the pillars, and the sprouts on the branches should be cut off at any time. With the extension of the new shoots, the shoots should be tied 2 or 3 times. Supplementary grafts that did not survive, should be selected in the appropriate position, occurred on the anvil pile buds to stay 2 to 3, in July to August budding. After loosening the graft for 2 to 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. ZHANGJIAGANG DINSHENGLIN TRADING CO.,LTD , https://www.dslhouse.com