FEATURES OF REGENERATIVE ABILITY IN CUTTINGS OF TECHNICAL VARIETIES OF BIANCO, VIORICA AND RITON
The article presents the results of three years of studies on regenerative processes in technical white one-bud cuttings of resistant varieties of grapes Bianca, Viorica and Riton. The studies were conducted in greenhouse experiments at the Department of Viticulture of Kuban State Agrarian University. It was found, that the cuttings of Viorica varieties had achieved the best ripening, and the worst was Bianca. Varieties of Viorica and Ryton which have rather good level of ripening of the cuttings, had starch in carbohydrates and Bianca variety had sugar. Earlier blooming of buds characterized the cuttings of Ryton. Blooming of the buds of Bianca somewhat delayed. Maximum length of the shoots characterized the cuttings of Bianca, and the lowest - Viorica. The shortest pre-root period (26.3 days) was observed in Ryton, and the longest (29.3 days) - in Bianca. Viorica was characterized by the highest yield of cuttings with 3 roots and more (81.3%), this indicator was a bit less (72.5%) for Ryton. For Bianca it was minimal and it was 26.3%. A similar pattern was observed for the average number of cuttings formed at the roots: the variety Viorica - 9.4 pc.,Ryton - 8.1 pc. and Bianca - 4.3 pc. Thus, cuttings of the varieties of Viorica and Ryton belong to a group with a very high root growing activity and Bianca has an average activity