ВЕГЕТАТИВНЕ РОЗМНОЖЕННЯ ДЕКОРАТИВНИХ ФОРМ ВИДІВ РОДУ ULMUS L. МЕТОДОМ ЩЕПЛЕННЯ

Abstract

An important task for expanding the range of woody plants, which will contribute to the preservation of their biodiversity and rational use of plant resources, is to establish their reproductive capacity and the most optimal methods of propagation. The article deals with the results of research and generalizationof work on the peculiarities of vegetative propagation and cultivation of planting material of species and forms of the genus Ulmusin the Right Bank Forest-Steppe of Ukraine. Vegetative propagation of ornamental forms of Ulmus L. species using the inoculation and grafting methods such as chip grafting, improved chip grafting and improved chip grafting modified by V. F. Sobchenko in the early spring period and summer budding in the first decade of August on the rootstocks U. laevisand U. glabrawas studied. During budding in the first decade ofAugust, U. g. Pendula (80.5 %) and U. g. Rubra (79.0 %) on the U. glabrarootstock had the best survivability, while no significant difference was observed between them. The lowest survivability (39.5 %) was the characteristic of the decorative form of U. g. Crispa Pyramidalis. It should be noted that almost all decorative forms of species of the genus Ulmus, except U. g. Crispa Pyramidalis, with all methods of inoculation had a fairly high survival rate when grafting three-year-old seedlings of U. glabra(63.0-100 %). According to the results of graftingdecorative forms of species of the genus Ulmuson U. laevis, the best results were obtained in such decorativeforms as U. g. Pendula and U. g. Rubra (76.0-98.5 %). The average indices of survivability were observed in U. g. Albo-variegata (60.0-79.0 %). We should also mention that U. g. CrispaPyramidalis, as well as during U. glabragrafting, had the lowest survivability (38.5-66.0 %). Under the propagation of decorative forms of U. g. Pendula, U. g. Albo-variegata, U. g. Crispa Pyramidalis and U. g. Rubra with grafting shows the highest yield of cuttings on the rootstock U. glabrais 63-100 %, when using the budding method in lateFebruary – early March. Therefore, for the propagation of all studied decorative formsof species of the genus Ulmusthe best in the early spring growing season were the inoculation and such methods of inoculation and grafting as improved chip grafting, improved chip graf ting modified by V. F. Sobchenko and chip grafting. It is advisable to use U. glabraand U. laevisas rootstocks.