After several years of experimentation and practice, the author has found out a method of changing the walnuts for better or worse, that is, “three years of cutting and renewing the first year, grafting and planting in the first year, and positioning and shaping in the third yearâ€. The effective method of inferior walnut trees. The China Agricultural Network finishing report is as follows for reference. 1 first step truncated update For trees that need to change the fine varieties, design the tree according to the specific situation. The whole tree branches according to the design of the tree shape, useless from the base of the sparse, need to use the pile to intercept dry, stimulate the emergence of latent buds, according to the needs of plastic surgery to choose to retain the permanent extension of buds and temporary spare buds. The best cut-off period is before the budding in early April. During this period, the tree body has less injurious flow and large stimulation power, which is favorable for latent bud germination and wound healing. The length of cut-and-dry piles should not be too complex. Medium-sized trees should be above the main branch of the first layer, with a 60 cm interception at the center and a 50 cm cutoff at the main tree of the first layer. Tree tall, should be in the main branch of the second layer above, the center of dry interception of 30 cm, the main branch of the second layer to retain 20 cm, the main branch of the first layer to intercept 50 cm. All the kerfs must be smoothed and wrapped with a film to prevent chapped sections and promote healing. Select the anvil bud timely after cutting. That is, one bud is left on both sides of the trunk stem, one is left on the back of the second main stem, and the other one is left on the back of the main stem of the second layer. One bud is left on the lateral side of the main stem of the second layer and one bud is left on the back of the main stem of the first layer. Leave one bud on one side and one on the other. Especially the lack of branches, we must fill in empty buds. The remaining buds were not erased in time to reduce nutrient consumption. The selected extension shoots and spare shoots were picked up to 20 cm in length to prepare for grafting. 2 The second step grafting Choosing the best varieties of walnuts in the region, and then grafting them in July of the same year or June of the following year. Grafting method: skilled workers use square buds, unskilled people can use I-shaped buds. It is best to use two woodworking cutting plywood blades with rectangular wood blocks (width 3 cm, thickness 2 cm) in the middle, self-made double-blade bud grafting knife, which can not only be quick but also ensure that the “open interface, cut buds†is equidistant from top to bottom. . Regardless of the type of connection, the anvils left after one finish, the interface must be arranged in the direction of extension of the graft. After being connected, a transparent film strip wider than the interface is used, and it is fully closed and tightly packed to promote survival. After that, we must strengthen management. To prevent grafting and germination in July of that year, grafting should only prevent the growth of buds. After grafting, we only pick the anvils, do not move other branches and leaves, do not cut the anvil, and do not lift the bandaging membrane. Bandaging membranes. For grafting in June of the second year, it is necessary to promote the post-control and strive to ensure that the graft will not only have a certain amount of growth, but also safely survive the winter. Therefore, after grafting, three compound leaves were left to cut off the anvil tip. After 10 days, the survival condition was checked. The compound leaves were cut off, and the other buds were erased at any time, and the concentrated nutrients promoted sprouting of buds. When the buddrilled film lengthened to 10 cm, the stems were cut off, the bandaging membrane was removed, and the rapid growth of the graft was promoted; the heart was picked up till the end of August to control the height and strengthen the development of the lower part. In addition, although the healing power of walnut Strong, strong interface, but the amount of new grafts is heavier than that of other fruit trees, and the top of the tuyere still requires a tied stick to prevent wind deflection. 3 Step 3 Positioning and Shaping After the third year of cutting and updating, the new grafting is generally about 80 cm long and the cultivation techniques of walnuts in Weibei dryland have begun. The plastics should be positioned in a timely manner to promote the rapid restoration of production of the canopy. The specific method is: After the leaves are displayed in the spring, a robust vertical erection branch with 80 cm short cuts is selected in the center, and the main branch of the second layer or the third layer is promoted, and the other branch is pulled into the level to serve as an auxiliary branch. The 2nd main trunk extended the branch to leave a 60 cm short cut, triggering the 2nd side branch. Lateral extension branches do not cut slow release. When the extension is damaged, the replacement branch is pulled to the extended position instead of the extension branch. The rest of the temporary spare branches are put slowly for early results. Summer branches are more flexible and can adopt other measures such as pulling, pulling and falling to adjust the azimuth angle of the main branch. In the summer of the following year, the main lateral branch angle was further adjusted. The main branch of the second or third layer was selected on the central branch, and the remaining branches were sheared from the base. The extension branches of the main branches of each layer shall be slowly placed, and the lateral branches shall be short-cut at the full shoots to promote branching. Temporary spare branches, sparse from the base, which have an effect on ventilation and light penetration and on the branches, have no effect on the retention of results. At this point, the new tree frame crown structure was completed. In the next two or three years, all branches will be slowly released, except for continuing to adjust their perspectives, eliminate unnecessary branches, and control the back branches. The temporary spare branch has completed its mission and should be handled as appropriate. It should not be allowed to become a branch and affect the normal growth of the previous branch. Practice has proved that using the three-step method not only enables the old branches of the tree to be renewed, the varieties are improved, and the irregular tree shape is also reasonably transformed. Take the grafted Qingxiang and Zhonglin No. 3 varieties as examples to achieve fruitful results in the 3rd year, and enter fruitful periods in the 5th and 6th years. The annual production value exceeds twice the original value. Fruit And Superfood Raw Powder Fruit And Superfood Raw Powder,Water Soluble Strawberry Powder,Ginger Powder,Fruit Juice Powder XI'AN PLANT BIO-ENGINEERING CO.,LTD , https://www.plantbic.com