VARIATION OF STRUCTURAL BUNCH AND BERRIES INDICATORS AND PHYSICO-CHEMICAL WINE PROPERTIES OF CABERNET SAUVIGNON CV. UNDER INFLUENCE OF DEFOLIATION AND HARVEST TIME IN AGROECOLOGICAL CONDITIONS OF CENTRAL SERBIA
Defoliation and different harvest time can affect structural composition of bunch and berries. Research was carried out at Cabernet Sauvignon variety in vineyard of King Peter I Karadjordjevic-Royal Winery, Serbia. Defoliation included treatments with 4 and 8 removed leaves and control. The harvest was done at full maturity and 15 days after. Structural cluster indicators in time of full maturity had higher value in treatment with 8 removed leaves. At late harvest the highest values was founded in treatment with 4 removed leaves (epidermis 15.2%, mesocarp 73.8%, seeds 10.9%). By physico-chemical analysis of wines was founded the highest alcohol content in treatment with 8 removed leaves (12.13% v/v). In control was recorded the highest levels of total extract and extract without sugar. Total acid content was higher in treatment with 8 removed leaves. The highest level of total polyphenol level (1.584 g/l) was noted in treatment with 4 removed leaves. In treatment with 8 removed leaves was recorded the highest level of total anthocyanins (0.166 g/l). In term of late harvest most of examined parameters had higher values.In the second experimental year parameters of physico-chemical wine analysis had significantly higher values compared to both harvest terms.