Grapevine (Vitis vinifera L.) is among the most valuable and widespread crops in world agriculture, distinguished by its rich varietal diversity and wide economic significance. Within this diversity, table varieties occupy a special place as a crop intended for direct consumption, distinguished by an attractive appearance, balanced taste and high nutritional value. The phenological development of table grapevine varieties is an important indicator of their adaptability to agroclimatic conditions and effective production management in modern viticulture. The present study aims to assess the influence of climatic factors on the course of phenological phases in the local varieties "Super ran Bolgar", "Brestovitsa" and the introduced variety "Italia", grown in the Thracian Lowland region, by applying the unified BBCH scale. The experiment was conducted during two growing seasons (2023-2024). The main phenological stages were monitored: bud burst (BBCH 0:05 - 0:08), leaf development (BBCH 1:11), flowering (BBCH 6:60, 6:61, 6:65 and 6:69), fruit development (BBCH 7:75), fruit ripening (BBCH 8:81 - 8:85) and reaching technological ripeness (BBCH 8:89). The analysis was based on agrometeorological indicators - air temperature and precipitation. The results show that the temperature regime has a significant impact on the speed of transition between the individual BBCH phases, with a tendency to delay with increasing temperature. The variety "Super ran Bolgar" reaches the phases from 8:81 to 8:89 earlier, being characterized by the shortest vegetation period. "Italia" exhibits a longer phenological cycle and higher heat requirements, while "Brestovica" is characterized by intermediate indicators and good adaptability to varying climatic conditions. The obtained results emphasize the importance of the BBCH scale as a reliable tool for standardized assessment of phenological development and provide a scientific basis for optimizing agrotechnical practices and varietal selection in conditions of climate change.

air temperature; BBCH scale; climate change; table grape varieties; phenological stages; precipitation

agronomy

Presentation: poster