BIOCHEMICAL INDICATORS DYNAMICS OF THE GRAPES HYBRID FORMS OF THE TECHNICAL USE DIRECTION

This paper reflects the results of research work on the study of biochemical characteristics of new hybrid forms of grapes for technical use, as well as phenological characteristics and mechanical composition of clusters and berries. These hybrids are selected by the Anapa Zonal Experimental Station of Vine and Winemaking (AZOSViV), of late ripening, high-yielding, winter-hardy and tolerant to phylloxera. Biochemical studies were carried out at the Center for Collective Use "Instrument-Analytical" of the Federal State Budgetary Scientific Institution North Caucasian Federal Scientific Center for Horticulture, Viticulture, Winemaking for the content of sugars, titratable acids, phenolic and nitrogenous substances, cations in grape must. Analysis of the main indicators was carried out in comparison with the control variety – Cabernet Sauvignon (a classic technical grape variety of late ripening). The ultimate goal is to develop new sustainable and high-tech grape varieties and further recommend bringing them into production. As a result of research, it was found that the studied hybrid forms Z-20 and Z-21 have annual stable indicators of sugar accumulation – 22.9 and 22.2 g/100 cm3, respectively, which is an average of three years compared to the control Cabernet Sauvignon variety – 22.7 g/100 cm3. The studied hybrid forms are much superior in some parameters of the mechanical composition of the bunches to the control variety, especially in the ratio of ridges and berries, juice and dense parts of the pulp. The studied grape hybrids are promising in order to become worthy varieties and to obtain high-quality dry and dessert wine from them, which is confirmed by the high content of phenolic substances and the optimal ratio of the mass concentration of sugars and the titratable acidity of the must of these hybrid forms.