Serious Walnut Graft Survival difficult to Walnut Graft Seedling Graft Management

Walnut contains a lot of walnut quinone (commonly known as tannin), and the bleeding is more serious, so it is difficult to survive after grafting. However, as long as scientific management is carried out, the survival rate of walnut grafted seedlings can reach 85%, even higher than 90%. The key technologies are as follows:

Walnut seedling management

1. Then go to the head and leave the leaves in time. That is, within three days after grafting, the walnut should shave all the leaves and branches below the buds, and cut off all the branches and buds except the above two buds. It is necessary to keep the grafted seedlings well ventilated and transparent, but in cloudy days or dew periods.

two。 Secondary cutting anvil. The second cutting of the anvil should be carried out in time in the next 10-12 days, and should be delayed in sequence in case of low temperature and rainy days. Specific methods: back to the bud at an angle of 45 degrees, cut off the reserved leaves above the bud, and the cut mouth is 1.5~2cm away from the upper mouth of the bud. Both ungrafted seedlings and missed seedlings should be cut off, and the good light and heat conditions of grafted seedlings should be ensured.

3. Wipe cute, weed and fertilize. After the second cutting of the anvil, all the buds except the buds should be wiped out in time, and they should be wiped early, small and wiped, so as to avoid the competition between sprouting and budding for water and fertilizer. Weeding can be carried out simultaneously with sprouting. When budding grows to 5cm, foliar fertilization can be carried out with 0.3% urea + brassin or auxin. In order to prevent interface infection and the harm of leaf-eating insects, when applying fertilizer, it is necessary to spray decaying insecticides at the same time.

4. Unbind. Unbind the plastic strip from the back of the interface from the bottom to the top with a blade when the average growth of the inoculation is above 10cm. Do not completely cut through the plastic strip (leave 0.5cm at the upper mouth), let alone remove the plastic strip. At the same time of unbinding, the missing sprouts should be finally cleaned to ensure the normal growth of walnut grafted seedlings.

5. Promote growth and strengthen. After unbinding, walnut seedlings enter a vigorous growth stage, which generally lasts for 25 to 30 days. Water and fertilizer management should be strengthened. 0.3% urea + brassin or auxin can be sprayed twice every seven days in the early stage, and 0.3% potassium dihydrogen phosphate is sprayed three times in the later stage, once every seven days, so as to make it lignified as soon as possible, and gently pick the heart of the prosperous seedlings in time (one heart and one leaf), in order to improve the overwintering cold resistance.

6. Winter against cold, early spring against freezing. First, before the Beginning of Winter, walnut trees were sprayed with antifreeze (such as Happy Forest water conservation antifreeze); second, before soil freezing, frozen water was irrigated and irrigated in the nursery during soil thawing in early spring to reduce soil temperature and postpone the germination period of walnut seedlings.