How should ginkgo trees be grafted when planting?
How are ginkgo trees grafted? Why are ginkgo trees grafted? What grafting methods are there? Please give an introduction. Reasons for grafting ginkgo trees: Ginkgo is a long-lived tree. It not only grows slowly, but also flowers and sets seed very late; generally, it does not begin to flower and set seed until the tree is 20 years old. However, if grafting propagation techniques are used, it can flower and set seed in 2-3 years...
How are ginkgo trees grafted? Why are ginkgo trees grafted? What grafting methods are there? Please give an introduction.Reasons for grafting ginkgo trees:Ginkgo is a long-lived tree. It not only grows slowly, but also flowers and sets seed very late; generally, it does not begin to flower and set seed until the tree is 20 years old. However, if grafting propagation techniques are used, it can flower and set seed in 2-3 years.
Detailed operation method for grafting ginkgo trees:
1. Selection of ginkgo rootstock for grafting: 2-3 year old seedlings are preferable, because 2-year-old seedlings have more branches and leaves, a well-developed root system, and rich nutrient storage, so the grafting survival rate is high, generally above 90%.
2. Selection of ginkgo scions for grafting: During the growing season, collect 1-year-old branches from 30-40 year old trees of superior varieties as scions. Collect and graft as soon as possible; if long-distance transport is needed, pay attention to moisture retention to prevent rot. If conditions permit, they can be stored at low temperature (3-5°C), or sealed with wax to retain moisture. Ginkgo is dioecious, so when collecting scions, they should be collected and stored separately according to sex.
3. Grafting method for ginkgo trees: Grafting is carried out from late June to early August each year. When grafting, cut off the new shoot of the rootstock at the semi-lignified point, and use a sharp knife to make a vertical cut in the center of the cut surface, with a cut length of 2-3 cm. At 1 cm below the scion bud, cut downward into a wedge shape with symmetrical sides and a slanted cut surface 2-3 cm long, then cut off at 1 cm above the bud, making a single-bud scion with symmetrical wedge-shaped sides.
Quickly insert the prepared scion into the cut in the rootstock so that the cambium on the smallest side of both aligns, and promptly tie it tightly and firmly with plastic strips, leaving the bud eye exposed. If conditions permit, a plastic bag (3-4 cm in diameter, 10-15 cm long) can be placed over the scion to prevent excessive water evaporation and provide protection. The grafting time should preferably be chosen on cloudy days with low temperature and high relative humidity, but grafting should not be done in rainy weather.
After the graft survives, promptly remove the plastic bag that was placed over it. In addition, female and male plants of grafted seedlings in the nursery should be distinguished.
4. Management of grafted ginkgo seedlings: After the graft survives, it can grow in the original seedbed for 1 year. During this period, generous fertilizer and water should be applied, foliar feeding can be carried out, and timely cultivating and weeding should be done to speed up seedling growth. In the spring of the 2nd year after grafting, transplant and set them out at a spacing of 30 cm x 60 cm. After another 2 years, thinning can be carried out by alternate rows and alternate plants, which helps cultivate large seedlings of different specifications. Seedling transplanting can be carried out around Frost's Descent.
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