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¹ Van Yüzüncü Yıl University, Faculty of Agriculture, Department of Horticulture, Van, Türkiye
² Apricot Research Institute, Malatya, Türkiye
³ Ankara University, Faculty of Agriculture, Department of Horticulture, Ankara, Türkiye DOI : 10.52001/vis.2023.17.25.30 Viewed : 1362 - Downloaded : 687 In this study, phenological stages and effective heat summation (EHS) requirements of ten grape cultivars (Banazkara, Köhnü, Kureyş, Tahannebi, Öküzgözü, Ağın Beyazı, Barış, Hatun Parmağı, Italia, and Horoz Karası) grown in Apricot Research Institute Battalgazi Campus Collection Vineyard in Malatya which is one of the important wine growing provinces of Türkiye were determined in the vegetation period of 2021. A double T support system was used and a bilateral cordon training system was formed on the trunk of 80 cm height for the grapevines on the 110 R rootstock by applying a planting density of 3.5 x 2 m in the eight-year-old collection vineyard. For each cultivar, EHS values were recorded with a daily temperature recorder (HOBO) in the stages from the bud break to full bloom, the full bloom to veraison, the veraison to ripening, and from the bud break to maturity. As a result of this study, the EHS values of the cultivars were determined between 1583.5-2113.5 degree days (DD) after the calculation performed by using the average temperature values in Malatya. The lowest EHS requirement was determined as 1583.5 DD in `Tahannebi`, while the highest EHS value was determined in `Ağın Beyazı` with 2113.5 DD. Keywords : Vitis vinifera L. Viticulture Ecology Temperature