DEPENDENCE OF WINE QUALITY ON ABIOTIC FACTORS OF CULTIVATION OF KRASNOSTOP AZOS GRAPE VARIETY
At the moment, there is no systemic scientific knowledge about the mechanisms of the influence of the grafted culture on the quantitative and qualitative indicators of grapes and wine production. Establishing the regularities of the influence of various norms of the grape bush load in own-rooted and grafted culture on the grape quality, as well as the aesthetic and biological value of wine products in conditions of terroir changing biotic properties, is very relevant at the current stage of development of the wine-making industry in Russia. The objects of research were grapes and wine material of the Krasnostop AZOS variety in grafted and own-rooted culture with variants of different shoot load on the bush. The experiment of studying the influence of various agrotechnical methods on the productivity of a grape plant and the quality of wine material was laid in the Anapo-Taman climatic zone of the Krasnodar region of Russia. The highest yield of the Krasnostop AZOS variety during the years of the study was obtained in the variant of own-rooted grape growing with its load of 36-40 shoots per bush. In our studies, there is a tendency to an in-crease in grape sugar content and a maintenance of the titratable acidity when the Krasnostop AZOS variety is growing on vineyards in own-rooted culture. The most optimal ratio of sugar content and titratable acidity in the experiment was possessed by grapes from a variant of own-rooted culture with a load of 36-40 shoots per bush - the glucoacedometric indicator was 4.36. In the studied variants, the largest number of phenolic substances was found in wine material from own-rooted grapes with a load of 36-40 shoots per bush - 4130 mg/dm<sup>3</sup>. This had a positive effect on the organoleptic evaluation of this sample. The largest total amoun of biologically active substances in the studied samples was found in wine materials from grapes in a grafted culture (134.9-147.9 mg/dm<sup>3</sup>). During the years of study, wine materials from grapes of own-rooted culture proved to be of the highest quality. This advantage over the grafted crop was traced in all variants of rationing the shoot load of grape bushes.