Green Branch grafting technique of Ginkgo biloba

Green Branch Grafting Technique of Ginkgo biloba

Ginkgo has a variety of seedling methods, but the cost of seeding seedlings is high, the trees have a long juvenile period, and the results are late; the survival rate of cutting seedlings is low; hardwood grafting should be carried out in spring, and the survival rate is about 80%. If green branch grafting method is adopted in growing season, the survival rate can be increased to more than 95%. The following are the main points of green branch grafting technology:

I. Grafting time

It can be done from late May to late August. However, grafting cannot be carried out in high temperature and dry weather, especially at noon on sunny days, and it should be avoided in rainy days.

II. Collection of scions

Collect the healthy branches of the same year from the middle and upper part of the mother tree of Ginkgo biloba, cut off each leaf on the scion, only leave the petiole, cut a section every 2~3 buds, and then immerse the lower end of the scion in water or wrap it in warm cloth for later use. It is best to pick up with the next, the day can not be used up scion placed in the refrigerator or cold storage. [Yoshiyama Hana Yao]

III. Rootstock selection

Ginkgo seedlings with strong growth, straight trunk and strong resistance were selected as rootstocks.

IV. Grafting position

Depending on the future use of the seedlings. For street trees in the future, graft at 2.5 meters of rootstock stem height; for garden planting, graft at 1.5~2 meters of stem height; for early-maturing dense high-yield forest, graft at 0.6~1 meter of stem height.

V. Grafting methods

Splitting and cutting can be used. 1. Splitting method: first cut at the height required by the rootstock, and vertically cut in the center of the cross section, depth 2~2.5 cm, cut an inward smooth slope on both sides of a bud at the lowest end of the scion, cut the surface about 2.5 cm long, make the lower end of the scion wedge (the side with buds is thicker), and then quickly insert the rootstock split, so that the two formed layers are aligned, immediately bundled. In particular, it is required to seal the incision on the scion to ensure survival. But the binding should not be too tight, lest the young shoots be broken. 2. Cut method: cut scion, cut from the scion side of the lower end of a smooth long slope about 2.5 cm. shear rootstock, vertically cutting down at that same width of one side of the cross section and the scion interface, with the depth of 2 - 2.5 cm, insert the scion long surface inward and the short cutting surface outward into the incision, so that the rootstock and the scion cambium are butted or aligned at one side, and bandaging.

VI. MANAGEMENT

After 2 weeks, the survival rate was checked, and the fresh buds were regarded as survival. Check while untying and wiping off sprouts 30 cm below the grafting site. Those that did not survive were repaired in time. Thin fertilizer and frequent application, timely watering, timely spraying, pest control.