When is the best grafting time for walnuts? In general, the grafting of walnuts is the best way to increase the amount of walnut trees and improve the fruit. The following is mainly to talk about the best grafting time of walnuts, the commonly used grafting methods for walnuts, and the precautions for grafting and grafting. First, when is the best graft of walnuts? The most suitable grafting time for walnuts is before and after the Qingming period, but due to the difference in climatic conditions, the grafting time in the north and the south is slightly different. The north is generally in May-June, and the grafting time in the south is slightly earlier, generally in April-May, during this period. The survival rate of walnut seedlings is relatively high. Regardless of whether it is in the south or in the north, there are three criteria for the best time for grafting walnuts: 1 after the rootstock sprouts to the beginning of a leaf; 2 when the length of the new germinating roots of the normal plot is as long as 30-35 cm long or about 1 foot, the climate comparison Arid areas can be carried out when the length of the branches of the heart is slightly shorter; 3 the walnuts on the fruit trees that are to pick up the ears grow to the size of the table tennis. Second, which kinds of rootstocks are best for walnut grafting? The rootstock with excellent quality, good resistance and high affinity can not only improve the survival rate after grafting, but also ensure the growth, yield and fruit quality after grafting. Therefore, when selecting rootstocks, we must choose the high-quality rootstocks with strong environmental adaptability, good disease resistance and resistance, high grafting affinity, suitable for local environment and easy grafting, according to their own needs. For rootstocks, it is 1-3 years old. Walnut seedlings are the best. Here are some common rootstock types and their advantages and disadvantages for the eight kinds of walnut grafting, for your reference: Walnut Walnut grafted walnut affinity naturally needless to say, while having a very high survival rate, but the resistance is relatively poor. 2. Iron walnut Iron walnut is a variety in Yunnan, China, and its affinity is relatively good, and it grows more prosperous after grafting, but it is not cold-resistant, and it is more suitable for grafting in Hunan, Yunnan, Guizhou and other regions. 3. Walnut 楸 Walnut mites perform very well in grafting affinity, cold tolerance and environmental adaptability, but they are not drought-tolerant, and the seedlings grow relatively poor after grafting, and are also prone to small feet, which is more suitable for grafting in northern provinces. Wild walnut Wild walnut has very strong environmental adaptability and also has very good drought resistance, but it is easy to appear small feet after grafting. It is generally used as grafting rootstock in Hubei, Hunan, Yunnan, Sichuan, Jiangsu and other places. 5. Black walnut Black walnut is more prominent in cold tolerance, and has a very good ability to resist nematodes and root rot, but it will dwarf the height of the fruit tree after grafting, and occasionally black line disease will occur. 6. California Black Walnut California black walnut has good grafting affinity. Although it has good anti-Honey fungus effect, it has poor performance in resisting nematodes and root rot. 7. Texas Black Walnut Texas black walnuts perform better in grafting affinity and salt and alkali resistance, and also have the effect of dwarf trees. 8. Feng Yang Fengyang is a seedling of the walnut family. It has not only a well-developed root system, but also a strong environmental growth capacity. Special considerations for rootstocks: 1 small foot phenomenon: The phenomenon of small feet after grafting mentioned in the introduction of the rootstock mentioned above refers to the fact that the rootstock is relatively thin, but the graft interface is relatively thick. 2 rootstock wounds and water release: after the walnut, there will be a relatively heavy flow of glue, which is not conducive to the healing of the graft interface, but also easy to infect the disease, and is not conducive to the survival after grafting. Therefore, the walnut rootstock should be advanced before grafting 2 - 3 days at the base of the roots to injure and release water, and then graft. Specific operation method: You can use a small saw to saw 6-10 symmetrical wound mouths on the rootstock about 10 cm away from the ground. The depth of the kerf can be up to the xylem. This can reduce the wound flow of the walnut after grafting. problem. Third, how to choose and handle the scion of walnut grafting? 1. Choose scion The quality of the scion directly affects the survival rate of grafting of walnuts. For this reason, those that grow strong, have full buds, are full of development, have a small core, are highly productive, and have no pests and diseases, or one-year-old branches to make scions. 2. Collecting scion In the scion collection time, it is necessary to select the most active time for the formation of the walnut layer, so that the survival rate is the highest. It can flow upwards in the walnut tree sap, but the fruit trees have not been germinated before, and the scion is collected, usually collected around mid-March. In the collection standard requirements of scion, 1 thickness is 1-1.5 cm; 2 intercept length is 15-20 cm; 3 is about 10 cm away from the ground for grafting. For the early harvesting of the scion, attention should be paid to the scion protection. The scion of the scion can be sealed with wax, or buried in the shade with sand, or stored in an environment of minus 5 degrees to 5 degrees above zero and 70% humidity. Wait until the best time to graft is taken out. 4. What are the better grafting methods for grafting walnut trees? 1. Walnut grafting method and operation steps Like other fruit trees, walnut fruit trees are divided into two types: grafting and grafting. They can also be divided into a variety of grafting methods, such as splicing method, square grafting method, single/double door grafting method. The specific methods and operation steps of the above walnut grafting were detailed in the Goku question and answer on April 9th. If you need it, you can go to my personal homepage and look through the Q&A history article on April 9th. No more introductions. In addition, the splicing method is generally used in the spring branching of walnuts. Single-opening or double-opening buds are often used to graft walnut varieties that are difficult to survive, and can be germinated in the same year after grafting. The grafting of the squares is simple and easy to survive, and it is more suitable for buds to survive. Walnut varieties, and the germination rate after grafting is relatively high. 2. Bud and branch notes Bud connection is generally from mid-May to mid-June, and the grafting is more suitable for early April to early May. Compared with the two methods, the bud connection is simpler than the branching, because the temperature and humidity environment is more suitable, the scion and the rootstock are in In the long-term, so grafting is more favorable for wound healing, and after grafting, the bud sprouts faster and the lignification is better, and it is more conducive to smooth wintering. The survival rate is much higher than the grafting; High, it is not easy to survive after grafting. It is recommended that you adopt a higher survival rate. Whether it is bud grafting or grafting, it is necessary to ensure the grafting process is fast, accurate and in place on the basis of selecting high-quality scion and rootstock. At the same time, it is necessary to strengthen the management after grafting to ensure the high survival rate after grafting. 5. What matters should be paid special attention to the grafting of walnuts? 1. Check wound healing and survival After 10-15 days after grafting, the wound healing condition should be checked and whether it survives. If the petiole after grafting is touched or the buds start to sprout, it indicates that the grafting is successful. Otherwise, the grafting fails, and the secondary patching needs to be carried out in time. 2. In addition to the sprouting anvil After the grafting of the walnuts, the rootstocks are easy to germinate. The new sprouts on the rootstock should be removed once every 10 days, and the rootstocks should be removed 2-3 cm above the buds, so as to avoid sprouting and buds for nutrients. On the other hand, it can promote the growth of buds. 3. Untied topping After the walnut is grafted, you can wait until the new length is 10-20 cm to release the wound dressing. When the new one is 30-40 cm long, you should also pick the heart and fix it with bamboo poles or wooden sticks. This will avoid winter frost damage. It can also be prevented from being blown off by the wind. 4. Deworming and cold protection For newly grafted walnut seedlings, on the one hand, it is necessary to strengthen the control of pests such as moths and moths. On the other hand, before the soil is frozen, it should be buried or wrapped with warmth to protect the soil. If it can be overwhelmed, it can be buried. In the spring of the second year, when the fruit trees sprout, the soil is unearthed and the insulation is removed. The above is the main point of walnut grafting. If you feel that there are still places that can be perfected and supplemented, you can leave a lot of comments. The content source comes from the small back of the agricultural technology! Wifi Solar Camera,Solar Charging Cctv Camera,Waterproof Outdoor Camera,Outdoor Wifi Solar Camera Shenzhen Zuomi Technology Co., Ltd. , https://www.nbbkvis.com
