The yield and berry quality under different soil tillage and clusters thinning treatments in grape (Vitis vinifera L.) cv. Cabernet-Sauvignon

The effects of 3 different soil tillage treatments and 2 cluster thinning treatments on leaf water potential (Wleaf), yield and quality parameters of Cabernet-Sauvignon were investigated in this study. The research was conducted (40°58ʹ10.71 N, 27°28ʹ21.71 E) in Tekirdag, Turkey. There were no statistically significant differences among tillage systems. Half of the clusters on a vine were removed at the veraison for cluster thinning treatments. At the result the only significant difference was on the yield, regarding the cluster thinning treatment. Yield/vine values ranged between 2.2 - 2.3 kgvine-1 at the cluster thinning treatments and 3.4 - 3.5 kgvine-1 at the no cluster thinning treatments. The minimum value for soluble solids in juice was 21.04% at conventional tillage, and the maximum value (21.40%) was at the conservation tillage treatments. The conventional tillage treatment showed the maximum anthocyanin level (463.78 mgkg-1) followed by the conservation tillage treatment (460.14 mgkg-1) and minimum tillage treatment (407.86 mgkg-1) respectively regarding the total anthocyanin levels. The lowest phenolic compound values were obtained from CVT-NTH (361.93 mgkg-1) treatment. On the contrary in both conservative soil tillage [CST-NTH (488.36 mgkg-1), CST-CTH (467.79 mgkg-1)] applications values were higher. As a result, grape quality parameters were improved by using the conversation tillage treatment with natural grassing in Cabernet Sauvignon.