The influence of the type of root on the rooting of green roots of <i>Viburnum opulus</i>

Abstract The conducted research is devoted to issues related to the propagation of rooted cuttings of common Viburnum opulus . As the research results indicate, significant death among rooted cuttings occurs during the propagation period. The purpose of the study was to investigate the effect of different types of cuttings on the rooting of the cuttings of Viburnum opulus during this researched period. It should be noted that the rooting success of the cuttings was high. The cuttings were collected from native Viburnum opulus mother plants under the conditions of the nebulizing installation of the winter garden of the «Podillia» Botanical Garden of the Vinnytsia National Agrarian University within the framework of the implementation of initiative topics at the Department of Forestry and Horticulture. According to the results of our research, the highest percentage of death among rooted Viburnum cuttings, across all studied varieties, was observed in the variant where the cuttings were grown at the rooting site. In this variant, significant death rates ranging from 18.7% to 35.4%, depending on the variety, occurred during the growing season. The reason for this is very small areas of nutrition and, accordingly, the thickening of plants. In contrast, when rooted cuttings are transplanted in autumn, death rates during overwintering range from 10.4% to 18.7%, with lower rates during transplanting and the growing season. During spring transplanting, the death of root plants is observed mainly during overwintering and transplanting, to a lesser extent during the growing season. Comparing the growth indicators of rooted cuttings planted in open ground and those grown in containers, it should be noted that there is a significant advantage in the development of the root system and the above-ground part in container-grown cuttings.