Introduction of Ginkgo biloba L. and its cultivars by vegetative propagation
The study of the vegetative propagation of G. biloba and its cultivars by stem cuttings is currently relevant. Being of great scientific interest as a relic of past geological epochs, G. biloba is also a valuable ornamental plant, promising for landscape in single and group plantings. In addition, G. biloba is characterized by high resistance to gas, resistance to fungal and viral infections, pests, wind resistance, and a useful life of up to 2000 years. The late period of fruiting of G. biloba (25-30 years) and the diversity of its cultivars (more than 500 names) encourage the search for optimal ways of reproduction of these plants, one of which, in our opinion, is vegetative propagation by stem cuttings. Due to the limited theoretical data and a considerable difference in the results obtained after rooting cuttings, the issue of vegetative propagation of G. Biloba needs further research. In the course of the study, a comprehensive assessment of the results of root cuttings of G. biloba and its cultivars G. Biloba 'Blagon', G. biloba 'Menhir', G. biloba 'Saratoga', G. biloba 'Tit' were conducted, considering the following indicators: a type of stem cuttings (7 types), rooting period (day), rooting degree (6-point scale), integrated root index (U,%), rooting percentage (%), the yield of plants after winter (%). The research was carried out in the Sofiyivka National Dendrological Park of the National Academy of Sciences of Ukraine during 2020-2021.