Agriculture and forestry

Tsyhanska Olena – candidate of agricultural sciences, associate professor of the department of forestry and horticulture of Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna Str. 3; e-mail: lenkatsiganskaya@gmail.com).

The article examines the study of the features of cuttings for rooting and rooting of cuttings of the genus Spiraea L. as promising species and decorative forms for landscaping in the conditions of an urbanized environment, growing on the territory of the "Podillia" Botanical Garden of VNAU. In particular, Spiraea japonica "Golden Princess", Spiraea japonica 'Little Princess', Spiraea betulifolia, and Spiraea nipponica were studied. According to the results of vegetative reproduction on the territory of the botanical garden "Podillia" of the Vinnytsia National Agrarian University in 2021-2022, it was established that the use of growth stimulants during spirea cuttings contributed to their faster rooting and ensured better plant survival compared to the control. Species of spirea that grow on the territory of the botanical garden "Podillia" of the Vinnytsia National Agrarian University belong to the following sections: Calospira, Glomerati, Chamaedryon, Spiraria. The largest number of plants is the Calospira section, which includes plants of the species Spiraea japonica (Spiraea japonica L.), Spiraea bumalda (Spiraea bumalda L.) and Spiraea alba (Miq.) Zab. The results of the research indicate that the grafting ability of the cuttings is largely determined by the biological feature of the species and also the use of growth substances. The highest rooting in the control group was observed in Spiraea japonica "Golden Princess", and the lowest in Spiraea nipponica. The use of the growth stimulator "Kornevin" increased the level of rooting of cuttings for all researched species by 15% compared to the control group. The use of the drug "Heteroauxin" also contributed to the improvement of the rooting of spirea cuttings, the rooting rate of which is 90-100%, depending on the studied taxon. The use of growth stimulants in our experiment contributed to the formation of the largest length of main roots in spirea cuttings.

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