Propagation by green cuttings of promising varieties of black currant in cultivation in the North (Komi Republic)

Black currant (Ribes nigrum L.) is a popular berry crop in amateur and farm gardening in the Republic of Komi. In order to provide the population with currant varieties adapted to the conditions of the North, there is a need for vegetative propagation of promising varieties of this berry crop using green cuttings. Therefore, the purpose of this study is to establish the effect of root formation stimulants – “Kornevin” and “Epin-extra” preparations on the rooting of green cuttings of promising black currant varieties promising for the region. In 2021–2023, five varieties of this crop were tested: Altai (‘Seyanec Golubki’), Moscow (‘Vologda’, ‘Nasledniсa’), Michurin (‘Elevesta’) and Oryol (‘Lentyaj’) selection. The studies were carried out taking into account the guidelines of the VNIIR named after N.I. Vavilov. “Kornevin” and “Epin-extra” have confirmed their effectiveness as root formation stimulants in green cuttings of black currant varieties in the climatic conditions of the Komi Republic. On average, over three years of research, the rooting of cuttings was 81.1%, which corresponds to the recommended standard confirming the profitability of this method of cuttings. The choice of a stimulant for obtaining the maximum number of rooted cuttings depends on the currant variety. However, for some varieties, the effect of using stimulants for processing cuttings was very close to the control. “Kornevin” and “Epin-extra” have an effect on the number of roots of different orders in the studied varieties. The use of both stimulants in rooting ‘Elevesta’, ‘Seyanec Golubki’, ‘Vologda’ and ‘Nasledniсa’ was noted to have an effect on the length of the zero-order root. Some varieties also showed a positive effect on the formation of first-order roots. “Kornevin” was found to have a more significant effect than “Epin-Extra”.