Walnuts contain a large number of walnut pods (commonly known as tannins) in the tree body, and the injury is relatively serious, so it is difficult to graft and survive. However, as long as the scientific management, the survival rate of walnut grafted seedlings can reach 85%, or even higher than 90%. The key technologies are as follows:
1. Timely to leave the leaves. That is, in the next three days, all the following leaves and branch buds should be shaved and all buds and shoots except the two buds must be cut off. It is necessary to keep the grafted seedlings well ventilated and light-transmitting, but it should be carried out on a cloudy or dewy day.
2. Secondary anvil. After 10 to 12 days, the second anvil should be promptly processed. When cold weather and rain are encountered, the second cutting anvil time must be delayed. The specific method is that the back-butt buds are cut off at a 45-degree angle to cut off the reserved leaves above the bud, and the clipping distance is 1.5 to 2 cm above the bud. The ungrafted seedlings and the missed seedlings must also be cut to ensure that the grafted seedlings have good light and heat conditions.
3. Wiping weeding and fertilizing. After the second anvil, all buds other than the buds should be removed in a timely manner, so as to wipe early, wipe small, and wipe. To avoid sprouting and sprouting to make water and fertilizer. Weeding can be performed in parallel with the wiping buds. When the sprouting bud grows up to 5cm, once the foliar fertilization is performed, 0.3% urea + brassinolide or auxin can be used. To prevent interface infection and harm of leaf-feeding pests, rot insecticides should be sprayed during fertilization.
4. Untie the tie. When the seedlings grow to an average length of more than 10cm, they must be unfastened in time. The method is to use a blade to cut the plastic strip from the bottom to the top of the interface, but do not fully cut through (0.5cm is reserved at the upper mouth). Do not release the plastic strip. While unbundling, it is necessary to clean up the buds that have been smeared for the last time to ensure the normal growth of the grafted seedlings.
5. Promote prosperity. After unbundling, the walnut seedlings enter a vigorous growth stage. This period of time can generally last 25 to 30 days. The water and fertilizer management must be strengthened. The previous stage can be sprayed with 0.3% urea + brassinolide or auxin twice every 7 days. Once and later, with 0.3% of potassium dihydrogen phosphate evenly sprayed three times, once every seven days, so that early lignification, and Wang long seedlings in a timely manner gently topping (with one leaf can be), in order to improve cold resistance overwintering ability.
6. Winter cold and early spring freeze protection. The first is to spray antifreeze on the trunk before the winter (such as the forest water antifreeze) and the other is to water the frozen water before the soil is frozen. In the early spring, when the soil is thawed, the groundwater is poured to lower the ground temperature, delaying the sprouting period of the seedlings.
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