First, the grafting time In the walnut leaf development stage (ie, the male flower expands and extends to the loose powder before), the county usually takes April 15 to 25 as the optimum period. Severe injury is too early to survive; high temperatures are too late to heal the interface and the survival rate is reduced. Second, rootstock selection and water treatment 1. Rootstock requirements. Select 5 to 20 years of age, grow robust and disease-free pests, breast diameter can be 4 to 25 cm can be used as high-riser rootstock, 4 to 12 cm thick to stay a joint, 12 cm or more to leave 2 to 4 joints. 2. Rootstock bleeding treatment. Ten days before grafting, rootstocks were cut and sawed at 30 cm above the selected grafting site. After 5 days of sawing, the roots were severely damaged. The trees were severed at 10-30 cm above the grafting site and drained for the second time. Streaming trees are no longer draining. Saw the head at the selected grafting site when grafting and graft immediately. When grafting, there are still trees that have a bad flow (small proportion of them). In the bottom of the trunk, a knife is used to make a vertical injury and reach deep into the xylem to achieve the goal of releasing water. Third, grafting method Use the skinned tongue connection method. Specific steps: 1. Scion treatment. The scion was cut into 12 to 15 cm long sections containing two or more full shoots, and the whole scion was sealed after cutting. 2. Rootstock section treatment. Cut the flat section at the sawn cut interface of the rootstock, and determine the number of scions according to the thickness of the rootstock. Generally, 1 to 3 roots are equidistantly distributed in different orientations. The root stock of the rootstock inserted at the scions should be cut off by 6 to 8 cm, and then cut. 0.5 cm crescent shaped incline. 3. Scion scion. A horseshoe-shaped cut surface with a length of 5 to 8 cm is cut on the back of the bottom of the bud, and is cut into a container of water for later use. 4. Insert scion. Remove the scion from the water container, lift the cortex behind the cut surface, and immediately insert the cut scion into the skin of the rootstock incision, so that the skin of the scion is just about the inner layer of the rootstock. The depth of the cutting should be 0.5cm of wood (commonly known as "Lubai"). 5. Tied bagging. After the scion is inserted, the scion is immediately tied with a plastic strip. The section and the interface are covered with a wet newspaper that is slightly larger than the section. Then a single-layer newspaper is rolled on the joint into a cylinder. The upper end is 3 cm higher than the scion. Tie on the stock, then fill in the paper tube with moist fine soil (hands clumped, ground can be scattered to determine the standard of the soil), shake the trunk, so that the soil is practical, in the plastic bag corresponding to the thickness of the paper tube coat, The upper end is sealed, the lower mouth is tied on the rootstock, and a water line is tied in the middle. Fourth, after the management 1. Stubble. All buds on the rootstock will be wiped off to reduce nutrient consumption and promote budding and germination. 2. Release the air in time. About 20 days later, the scion buds grew and grew out of the newspaper, and a small hole was opened in the plastic bag immediately above the bud. When the scion grew 10 cm from the hole in the plastic bag, all the openings were opened. 3. Tie the bracket. When the scion grows to 30 centimeters, remove all the plastic bags and tie the brackets in time to prevent wind folding. 4. Buds pick up. High-failed trees were rejected, leaving 2 to 4 strong sprouts. The rest were erased. Buds were picked up in mid-to-late June. The growth reached 50 cm or more. Through two grafts, the survival rate can reach more than 98%. The high yield of walnuts is formed quickly, the results are early, the yield is high, and the flowers are grafted into flowers in the same year. The second year yields more than 0.5 kg. In the third year, the original canopy can be restored, and the strain can produce more than 2.5 kg. As early as 5 to 10 years earlier, the result of higher connection is obvious, the yield increase is obvious, and the benefit is significant. It is the fastest way to realize excellent seeding in our county. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone laparoscopic co2 insufflator, co2 Insufflation machine, co2 insufflator use, Co2 insufflator for endoscopy Hunan Yaoming Medical Technology Co, Ltd , https://www.yaominmed.com