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    Artificial Wounding Effects on cv. 'Cabernet Sauvignon' and cv. 'Merlot'; Cluster Morphology, Maturation and Quality Interaction
    (Springer, 2025) Candar, Serkan; Korkutal, İlknur; Bahar, Elman; Demirkapı, Ecem Kübra
    This study investigates the effects of artificial leaf wounding on cluster morphology, maturation, and quality of Vitis vinifera L. cultivars ‘Cabernet Sauvignon’ and ‘Merlot’ grafted onto SO4 rootstock in a vineyard in Tekirdağ, Türkiye, over two years (2021–2022). Ten wounding treatments, applied 15, 10, and 5 days before harvest, were evaluated using a Randomized Complete Block Design. Key parameters included cluster weight, width, length, gapped and non-gapped volume, berry number, yield, shoot number, total soluble solids (TSS, °Brix), pH, total acidity, phenolic compounds, anthocyanins, and tannins. Significant year effects were observed for most cluster traits, with higher values in 2021 for berry number, cluster number, weight, length, and shoot number, while 2022 showed increased cluster width and non-gapped volume. Cultivar-specific differences indicated cv.‘Cabernet Sauvignon’ generally exhibited higher cluster trait values, except for non-gapped volume. No significant treatment effects were observed on cluster morphology, likely due to vineyard homogeneity. Principal Component Analysis (PCA) highlighted that wounding timing and intensity modulated yield and ripening traits, with late-season treatments (PH1, PH5) enhancing phenolic and anthocyanin content. Hierarchical Cluster Analysis (HCA) confirmed treatment timing influenced ripening and phenolic profiles, with PH5 showing pronounced effects in cv. ‘Cabernet Sauvignon’. Late-season wounding, particularly PH1 and PH5, is recommended to enhance grape quality, depending on climatic conditions and vineyard management, offering potential for targeted viticultural strategies to optimize wine quality.
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    Bozcaada bağcılığındaki gelişmeler, sorunlar ve öneriler
    (Çanakkale Onsekiz Mart Üniversitesi, 2007) Dardeniz, Alper; Bahar, Elman; Şimşek, Levent
    [No Abstract Available]
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    Öğe
    Terroir-Driven Viticultural Micro-Zoning In Bozcaada-Turkey
    (Çanakkale Onsekiz Mart Üniversitesi, 2024) Ekinci, Hüseyin; Yiğini, Yusuf; Bahar, Elman
    Bozcaada is renowned for its vineyards and wines. The island is located in the northeast of the Aegean Sea, in the southwest section of the Marmara region in Turkey. It is the third largest island in the Aegean Sea after Gökçeada and Marmara Islands. The dominant crops are grapevines, legumes, cereals, and fruits. The total vineyard area in Bozcaada is 11.850 ha, which covers 1/3 of the island and 80% of the agricultural lands. The two main factors that support viticulture and winemaking on the island are the unique soil types and the climate conditions, especially the north winds that determine the optimal diurnal temperature variation for viticulture. The island is unique for its viticulture and is characterised by its “terroir”. Terroir is a French word that describes how the interaction of the soil, terrain, and climate effect the vine, and how the combination of this effect with the human factor and viticulture management practices influence the quality of the grapes. In this study, qualitative and quantitative land evaluation tools were implemented to assess the lands and to suggest the most suitable rootstocks and varieties to winemakers. The land evaluation model uses climate, soil, and terrain indicators to evaluate the suitability of the soil-mapping units to the rootstocks and vine varieties. A detailed soil map was produced and has been implemented into the process together with other soil characteristics and climatic/topographic indicators. GIS and remote sensing tools have been used to create the soil map and input layers. Aspect, slope, and elevation layers were produced using the ArcGIS 3D Analyst tool from SRTM (Shuttle Radar Topographic Mission) data distributed by the Joint Research Centre together with the International Centre for Tropical Agriculture in Colombia. The SRTM digital elevation data, originally produced by NASA, is a major breakthrough in digital mapping and provides high quality elevation data for mapping and survey studies. Soil plays an important role in land evaluation and site selection, especially in site assessment for vineyards as the soil use to grow vines effects the fruit quality and flavours of wines. A detailed soil map of the island was produced to provide high quality soil data to be used in the land evaluation model. In this study, the components of the terroir concept and their complex relationships have been analysed to evaluate the land resources of the study area and several indices have been calculated for use in the land evaluation model, these are: Branas Heliothermic Index, Huglin Heliothermic Index, Cold Night Index, Winkler Index (IW), Jackson and Cherry Index, Riou's Drought Index, and Jones Index