Grafting methods for grafting Propagation of Castanea mollissima

4. Skin insertion and tongue grafting

This method is used when all rootstocks and scions are peeled. When the thickness of the grafting part of the rootstock is more than 2 cm, the rootstock is truncated in a relatively straight position and the cross section is flattened. Cut off the old skin with a sharp knife on the smooth side of the cortex to reveal green tissue. The lower part of the cortex is thick and the upper part is thin. The cut face is slightly larger than that of the scion. The lower part of the scion was cut into a 3 cm ~ 5 cm long Malta-shaped cutting surface, and at the same time, the cutting cortex was pinched open, and then the xylem was inserted into the cortex of the rootstock, and the cortex of the rootstock was inserted between the scion skin and the xylem, and the two phases were contained and closely matched. The grafting site was tightly bandaged. The survival rate of this method is higher than that of subcutaneous grafting, but the grafting speed is slow, so it is suitable for beginners. The seedlings grow vigorously, but the wind resistance is poor.

5. Double tongue grafting

When the coarseness of panicle and rootstock is basically the same. Cut the rootstock from 8cm to 10cm from the ground, cut a Maltese-shaped surface from the bottom to the top of the cross section, and the lower part of the scion was also cut into a Maltese-shaped surface of 4cm, and cut 1.5cm ~ 2cm longitudinally at three points above the Maltese-shaped surface, and the ear and the cutting surface of the rootstock were inserted together to form layers aligned and embedded with each other. If the coarseness of panicle and rootstock is different, the cambium on one side is aligned. Then wrap the grafted site tightly with plastic strips. This method has the advantages of high survival rate, exuberant seedling growth and strong wind resistance, so it is suitable for beginners, but the grafting speed is slow.

6. Ventral grafting of single bud

It is used when the scion is scarce. Generally, one bud can be grafted. The scion is cut into a wedge, but the lengths of the two cutting faces are not the same. The long cutting surface is 1.5 cm and the short cutting surface is 1 cm. Cut the rootstock 7cm ~ 8cm from the ground, use scissors to cut a 1.5 cm long cut on one side of the cross section oblique to the other side of the anvil, the lower part of the cut is located in the middle of the stock, no more than 2cm, insert the long cutting side of the scion inward into the cut, and align the cambium on one side, and then bind tightly. The purpose of oblique shear is that the anvil does not split, and it is easy to bandage and survive. It is not suitable for beginners to use this method for those who are skilled in grafting.

7. Embedded budding

It is a method of bud grafting with xylem. Because there are grooves in the xylem of Chinese chestnut, T-shaped buds are not solid and are not easy to survive, so embedded buds are used. This method saves scions and is used when scions are scarce. It is widely used in spring. The method is to cut down an oblique knife 0.8 cm ~ 1.0 cm above the grafting bud, then cut it into a 30 °angle to the bottom of the first knife edge at about 0.8 cm below the bud, and remove the xylem buds with a length of about 1.6 cm ~ 2.0 cm. Then cut the corresponding incision on the rootstock according to the size of the bud. Insert the bud into the incision of the rootstock to align the cambium of the two sides. If the rootstock is thick and the scion is thin, the cambium on one side should be aligned. Then tie it tightly and tightly with plastic strips. This method is highly technical, and only those who are skilled in grafting can have an ideal survival rate.