Comparative analysis of grape yield regulation techniques as ways for improving the quality of harvested grapes and musts

Abstract

Regulation systems are systems used mostly for increasing quality of grapevine. The aim of study was to compare free different methods of grape yield regulation. Our experiment were done in 2024 on the white wine grape variety Riesling Italico (Vitis vinitera L.) in wine-growing refion Nitra. We used regluation methods – cluster thinning, inflorescence reduction and cluster tipping. The regulation of flowers were done in phenophase before flowering (BBCH 59) and cluster tipping and cluster thinning in pea-sized phenophase and bunch closure phenophase (BBCH 75 and BBCH 77).  All operations were done manually. Average cluster weight was highest in variant of inflorescence reduction. Average berry weight was measured in control variant, namely 1.32 g. The highest average grape yield per grapevine and per hectare was measured in control variant namely 2459.22 g per grapevine and 11.8 t per hectare. Highest yields in control variant is a result of non-interference.