DETERMINING THE GROWTH-STIMULATING PREPARATION "HUMAT +7" EFFECT ON THE GRAFTED GRAPE SEEDLINGS' YIELD, SURVIVAL RATE AND QUALITY
The purpose of the study is to develop effective elements of the technology for the production of grafted grape seedlings using a dose of growth-stimulating drugs to improve the quality and yield of grafted grape seedlings. Research objectives: to determine the effect of soaking scion-rootstock combinations before grafting in a growth stimulator on reducing the period of stratification; to determine the effect of the growth stimulator "Humate +7" when soaking scion-rootstock combinations before grafting on callus formation, yield and quality of plants after stratification; to establish the effect of soaking scion-rootstock combinations before grafting in a growth stimulator on the survival rate of grafted grape seedlings in the crop of saplings. It was found that the most regenerative activity in the Tsimlyansky black variety was shown by the variant with soaking in the preparation "Gumat +7" (scion + stock), in which, on the 15th day after inoculation, 100 % callus formation and eyes arousal were observed in 93.3 % of grafts. Improvement of the indicators of the development of grafts in the stratification chamber after grafting had a beneficial effect on the final yield of seedlings. The previously described variant in the Tsimlyanskiy black variety, the yield of seedlings made 77.1 %, while the control variant made up only 28.6 %. In the Cabernet Sauvignon variety, the variant with soaking the scion part in the "Humate +7" preparation showed itself best, where 100 % callus formation was also observed, eyes awakening in 26.7 % of grafts, and the final seedling yield (68.6 %) was 6 times more control (11.4 %). In the Cabernet Sauvignon variety, the variant with soaking of the scion part in the "Humate +7" preparation proved to be the best, where 100 % callus formation was also observed, eyes arousal in 26.7 % of vaccinations, and the final yield of seedlings 68.6 % was 6 times more than the control one (11.4 %). High rates of seedlings yield relative to the control variant indicate the effectiveness of the studied method.