INFLUENCE OF METHODS OF MAINTAINING THE VARIETY KRASNOSTOP AZOS AND ITS LOAD ON THE YIELD AND QUALITY OF GRAPES AND WINE FROM IT

The qualitative characteristics of technical grapes and wine largely depend on the system of this crop. The objects of research were grapes and wine material of the Krasnostop AZOS variety in grafted and own-rooted cultures with variants of different loads of shoots on a bush. The experience of studying the influence of various agrotechnical methods on the productivity of a grape plant and the quality of wine material was laid down in the Anapo-Taman climatic zone of the Krasnodar Territory of Russia. The largest yield of the Krasnostop AZOS variety during the years of the study was obtained in the variant of own-rooted grape cultivation with its load of 36-40 shoots per bush. In our studies, there is a tendency to increase the sugar content and reduce the titratable acidity of grapes when maintaining vineyards of the Krasnostop AZOS variety in own-rooted culture. The most optimal ratio of sugar content and titratable acidity in the experiment had grapes from the variant of own-rooted culture with a load of shoots of 36-40 pcs/bush. In the studied variants, the largest amount of phenolic substances was found in wine material from own-rooted grapes with a load of 36-40 shoots per bush - 4130 mg/dm3. The maximum total content of substances from a number of biologically active substances was found in wine from grape raw materials obtained from a grafted culture (134.9 - 147.9 mg/dm3). In 2018-2019, from the organoleptic side, wine materials from own-rooted grapes proved to be of the highest quality.