Studies were conducted to determine the effect of potassium salt of indole-3-acetic acid on the rooting process and the quality of rooted grape cuttings. The work was completed in 2017–2018 on the sample of varieties Korinka russkaya and Victoria, which are most common in household plots of the Republic of Tatarstan. The lignified shoots of grapes were harvested in November and stored in plastic bags at a temperature of 2 ... 4°C. Before cuttings, they were soaked for 48 hours in tap water at room temperature and cut into two-kidney cuttings. The basal ends of the cuttings were furrowed. The ends of the cuttings (5 ... 6 cm) were immersed in solutions according to the experimental scheme: distilled water (control); indole-3-butyric acid, 3000 mg/l (standard); potassium salt of indole-3-acetic acid, 5000 mg/l; potassium salt of indole-3-acetic acid, 10000 mg/l. Processing the cuttings by potassium salt of indole-3-acetic acid composition at a concentration of 10,000 mg/L significantly improved the rooting process. The share of rooted cuttings in Korinka russkaya variety in 2017 was 77.5%, in 2018 - 90.0%. The greatest callus formation (29.0 ... 43.8%), the number of roots on the cuttings (26.0 ... 23.9 pcs.), The length of the roots (133.9 ... 140.1 cm) were noted in Victoria variety. A solution of indole-3-butyric acid at a concentration of 3000 mg/L also improved rooting compared to the control. Grape varieties varied significantly in the rooting of cuttings. On the Korinka Russkaya variety, all parameters on average over 2 years were higher than on Victoria cuttings.

When growing high-quality grape seedlings, an effective organization of production is required, aimed at the intensification and development of the industry. Rooting grapes with lignified cuttings is one of the most effective and economical methods of reproduction. The article presents the results of three-year studies (2019-2021) to study the effect of biologically active substances on the rootability of lignified grape cuttings. The object of the study is the Victoria grape variety obtained by crossing Vitis amurensis and Vitis vinifera with the Save Vilar 12-304 variety in VNIIVIV im. Yakov Ivanovich Potapenko. The variety under study is a table variety with an early ripening period, characterized by increased resistance to powdery mildew, oidium and gray rot. Withstands low negative temperatures up to -26 ... - 27ºC, with a period from budding to removable ripeness of 115-120 days. During the experiment, records were made about the growth of callus, rooting and output of standard seedlings. When studying the effect of biologically active substances on lignified cuttings, they were treated with salicylic and β-indolyl butyric acids at concentrations of 2000 and 3000 mg/l. As a result of the conducted studies, it was found that the highest percentage of rooting was obtained in the variant using salicylic acid at a concentration of 2000 mg/l and reached 84.5% on average over three years. The same version of the experiment showed the maximum yield of standard seedlings - up to 76.3% on average for three years.