Study of the influence of the number of clusters retained in the vine on the mechanical composition of grapes, the productivity and the quality of the product
Abstract
The research objects were the grape cluster, berry, skin, seed, comb, juice, and wine material. In the foothills and mountainous areas, the effect of the number of clusters in the vine on the yield and quality of the crop in the autochthonous Madrasa variety has not been studied. The research was conducted on four variants of the Madrasa variety by retaining 8, 12, 16, and 20 clusters in the vine. The highest structural indicator was detected when 8 clusters were retained in the vine (27.66), the least was observed with 20 (23.68) clusters, and the most rational when 12 (27.00) clusters were retained. The amount of comb in the cluster ranged between 3.48 and 4.05%, and the amount of seeds changed between 3.5 and 4.1%. When 8 clusters were retained, 1.4 kg of product was obtained from one vine, and 3707.2 kg of product was obtained from 1 hectare. As the number of clusters increased in the variants, a corresponding increase in yield per vine and per hectare was noticed. Increasing the number of clusters from 8 to 20 enhanced yield per vine and hectare but decreased water-soluble solids, phenolic compounds, antioxidant activity, and ultimately grape juice quality.
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