Why is grafting survival rate of fruit seedlings not high?

Anvil and spike incompatibility

The term “affinity” refers to the ability of rootstocks and scions grafted together to heal and grow. The size of this ability depends on the distance between the anvil and the ear: that is, the seedlings of the same species have strong affinity and grafting survival rate; The seedlings grafted survived or could not survive. If chestnuts use the same kind of seedlings as rootstocks, the grafting survival rate is high. Litsea chestnut and chestnut belong to the same species, with chestnut as the rootstock, grafting it chestnut, red hair, thin shell and other easy to survive, and grafting nine species, Jingxian chestnut, mountain bike red chestnut and so it is difficult to survive. The reason is that the rootstock and the scion are incompatible, the callus cannot grow, or the callus tissue cannot communicate with the transporting tissue, or other tissue is grown after connecting the transport tissue to cause the catheter or the screen tube to be blocked, and no nutrient exchange can be performed. Solution: When grafting seedlings, be sure to use varieties with good affinity and strong adaptability as rootstocks, and do not use rootstocks with incompatibility or poor affinity.

Grafting operation

When grafting, the anvil and the cutting surface are not even, and the forming layers of the anvil and the ear are not tightly aligned, or the contacting parts are extremely scarce. After the grafting, the sprouts of the hair leaves consume the water and nutrients in the scion, and the rootstock can not be supplied and dried up. . Solution: Grafting operators must strictly follow the grafting procedures. The scion and rootstock must be flat and smooth. Both layers must be tightly aligned, the interface tightly closed, and the bandaging membrane must not be released prematurely. Engaged.

Sprouting sprouts buds

When the grafting time is too late, the scion has sprouted when grafted, and then the leaves are pulled out quickly. After the water and nutrients in the scion have been consumed, the interface has not yet generated the callus, resulting in the interruption of water and nutrients. Or the buds are too weak to send a few leaflets and lose their ability to grow and survive. Solution: Do a good job of scion storage, timely grafting; do not have sprouting scion and weak shoots, axillary bud scion.

Anvil too early

In the early spring, rootstocks were sowed, and fruit seedlings were grafted in the summer and autumn. After cutting an anvil, the anvil died together. The reason is that the nutrients in the seeds have been used up, and the sprouts and rootstocks after an anvil are forced to “starve to death” because they have no leaves to make nutrients. Solution: 1 After 10 days of live, "anvil" at 5 centimeters on the interface. That is to say, the stems of the rootstock are broken by 2/3, leaving 1/3 connected, so that the upper leaves continue to produce nutrients to feed buds and shoots and to maintain the life of the stock. After the buds from the buds that grow up to grow to 30 cm high, the nutrients can be produced. Row anvil. 2 When grafting, leave 4-5 intact leaves under the interface. After the anvil is cut, the lower leaves will produce nutrients to supply budding leaves and rootstocks.

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