Published in Scientific Papers. Series B, Horticulture, Vol. LXVIII, Issue 1
Written by Anelia POPOVA, Ludmil ANGELOV
The experiment was conducted in the experimental vineyard of the Agricultural University - Plovdiv, during the period 2020-2022. Two clones of the Syrah variety numbered 174 and 470 grafted onto the SO4 rootstock were used. The green pruning operation 'bunch thinning' was applied, performed manually in the 'pea size' phase. Differences were found in the bunch structure according to the indicators - normal berries (%), bunches (%), milleranded berries (%), raisined berries (%), theoretical yield (%), average bunch mass (g) and average cluster size (cm). The mechanical analysis was obtained from skins (%), seeds (%), mesocarp (%), average weight of 100 berries (g), number of seeds in 100 berries, average seeds weight in 100 berries (g), average berry size (mm). The grape ripening dynamics was monitored, through the quantitative change in the sugar content (%) and titratable acids (g/l). The application of bunch thinning, as a widely known viticultural practice, part of the Canopy management complex of activities involved in, has had a positive impact on accelerating the grapes ripening and increasing its quality in the studied clones.
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