Propagating blackberry Black gem by root cuttings

The purpose of the study is to determine the best root formation stimulator for propagating blackberries by root cuttings. The studies were carried out on the territory of the Love Berry berry nursery (Moscow Кegion, Semenovskoye village (56°19′24″ N 37°07′29″ E)) in 2021-2022. The remontant blackberry variety Black Gem was used as an object. For rooting, the preparations Kornevin and EcoFus were used, control - water. One-factor experiment with 4 variants in three repetitions (50 cuttings in each repetition):1) variant 1 - control; 2) variant 2 - with dusting Kornevin; 3) variant 3 - soaking with EcoFus (50 ml/10 l of water, exposure 6 hours); 4) variant 4 - soaking with EcoFus (50 ml/10 l of water, exposure 6 hours) with dusting with Kornevin. Then the cuttings were placed in boxes with Agrobalt-N peat substrate. Planting pattern is 10 × 5 cm. In total, there are 600 cuttings in the experiment. When Kornevin was used, only6.6 % of the cuttings rooted, while in the control variant and with the use of EcoFus, the rooting percentage was much higher (57.8-66.7 %). The low efficiency of Kornevin can be explained by the high content of auxins of endogenous origin in the cuttings. A significant effect of growth regulators on root volume has been proven. The best development of the root system was observed in seedlings treated with Kornevin (13.3 ml) or EcoFus (13.0 ml). With minimal rooting on Kornevin, its role in the growth of the root system is high. EcoFus had a positive effect on rooting, root growth and development of the aerial part. No effect of growth regulators on the height of the aerial part was observed. The highest height is for seedlings rooted on Kornevin (24.7 cm), the smallest - without regulators (21.3 cm). For rooting cuttings, it is possible to recommend the use of EcoFus or rooting without growth regulators, followed by their use in growing seedlings.