RESEARCH ON THE VARIABILITY OF YIELD COMPONENTS IN SOME GRAPEVINE VARIETIES FOR RED WINES

Research was conducted during two growing seasons (2017-2018) in Miniş-Măderat vineyard. The study aimed to evaluate the variability of several red wine grape varieties in order to highlight their main qualitative and quantitative parameters. In the research were involved the morphological parameters: the number of bunches on the vine, the bunch weight, the number of berries in the bunch and the grape yield on the vine. The highest bunches number /vine registered Merlot variety (30.24), while Burgund variety recorded the lowest values (17.76). Burgund variety recorded the highest bunch average weight (119.57 g) while Pinot Noir recorded the lowest value (87.18 g).Merlot variety recorded the highest number of berries/bunch,(111.36) and the lower value was recorded by the Pinot Noir ( 82.36).The Merlot variety achieved a significantly higher production than the other varieties during both growing seasons (3600.87g). The conditions of 2018 growing season had a very significant positive influence on the grape yield/ vine.