Walnut summer budding and subsequent management techniques

Because walnuts contain more tannins, grafts tend to form a layer of black isolation on the surface of the scion, impeding sap flow, and thus affecting graft survival. Therefore, we adopted a few years of practice from 1999 to 2003, using walnut summer budding technology, bud graft survival rate of more than 90%.
1. Grafting time Walnut summer budding time in the outdoor temperature of not less than 29 °C, northern Hebei Province from early June to late August. At this point, the interface forming layer has a strong cell division, the cortex is easy to peel off, and the sprouting is easy to heal.
2. Scion collection Walnut summer buds make up for the shortcomings of winter scion grafting in spring, which is followed by picking, and the sources of scions are extensive. In high-quality, high-yield, and robustly growing plants, select the middle and upper parts of the shoots that thrive on full-grown, full-grown annuals that are full-grown and full-grown. The scion should be cut immediately to remove the leaves, in order to reduce the evaporation of water, petiole cut 2 cm, and then wrapped with wet sacks, transported to the nursery, stored in the shade, followed by access. The scion is best picked on the day of the day, not more than 24 hours, otherwise it will affect the survival rate.
3. Grafting method
3.1 Scioning Scion Choose a scion that is equivalent to the thickness of the rootstock. Cross a knife 1 cm above the shoot. Then incline a knife up to 1.5 cm below the bud until it reaches the edge of the bud, 0.6 cm wide. Gently pinch with your thumb and index finger. Remove buds and take care to prevent tearing off the inner vascular bundles and bud growth points when taking buds.
3.2 Grafting method Generally choose annual branches, choose a smooth place 10 to 15 centimeters away from the ground, leave 3 to 4 compound leaves under the interface, cut a knife, and then tap the knife in the middle to open an opening, the left hand to take bud shoots, Push the bud piece gently along the opening. The upper end of the bud piece should be closely connected with the horizontal rootstock. Then use 1.5cm wide plastic strips to put the buds tightly from the bottom up to expose the buds and expose the sprouts. No water.
4. After the management
4.1 Anvils Grafted before mid-July, after grafting, leaves 1 to 2 compound leaf anvils immediately after grafting, and repeatedly wipe the grafted parts up and down to sprout so as to stimulate sprouting as soon as possible. When budding sprouts 3 to 5 centimeters in length, the buds are cut off. After grafting in mid-July, it is not appropriate to cut the anvil after grafting because the shoots were too short to be fully lignified.
4.2 Unbundling Under normal circumstances, the buds and rootstocks will produce the healing tissue 10 to 15 days later, which means they can survive. At this time, they can be untied. However, in the event of a rainy weather or a low temperature, if the healing tissue grows slowly, it is necessary to delay the unbundling, or to loosen and loosen the bud, and then pack it tightly.
4.3. Summer shearing Grafting seedlings that were newly sprouted in the same year, in mid-September, took toppings on new shoots to promote branch shoots enrichment. For grafted seedlings that did not germinate in the same year, after germination in the second year, the rootstocks on the buds should be cut in time, and the sprouts under the buds should be wiped off so that the nutrients can be concentrated on the buds and the buds can grow rapidly. When the new shoot grows to 50 centimeters or so, it picks up the heart promptly and prompts the branching. In mid-September, the shoot shoots of the new shoots promote the enrichment of shoots.
4.4 After dressing bud survival survival, spraying phosphorus and potassium fertilizer to promote seedlings robust branches enrichment. Pay attention to drainage during the rainy season.
4.5 Diseases and pests prevention and control Attention should be paid to the prevention and control of insect pests such as size insects and moths.
4.6 winter overwintering 1 grafted seedlings that sprouted in the year should be plucked from the nursery after the autumn leaves, concentrated buried winter, to facilitate the second year of planting; grafted seedlings that did not germinate the year can be buried on the ground cold. Before the soil is frozen, saplings are gently bent so that the top is in contact with the ground. Then the soil is buried well and the thickness of the buried soil is 20 to 40 cm. Before and after the Ching Ming Festival, the cold soil is removed and the seedlings are straightened. . 2 Spray carboxymethyl cellulose 150 times, from the beginning of spring to the spring equinox spray 2 or 3 times, each interval of 20 to 30 days.

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