THE IMPACT OF ROOTSTOCKS ON YIELD AND FRUIT QUALITY OF SELECTED GRAPE VARIETIES GROWN IN NORTHWESTERN POLAND

The research examined the influence of various rootstocks on grape yield and fruit quality across different grapevine cultivars, conducted between 2020 and 2022 in northwestern Poland. The study covered light-colored grape varieties including Solaris, Muscaris, Johanniter, Hibernal, Helios, Riesling, and Chardonnay, focusing on the organic vineyard management system. The experimental setup compared the yield, size of clusters and fruits, sugar content, and acidity of grapevines grafted onto three different rootstocks (SO4, 5BB, 125AA). The findings highlighted significant differences in the yield and fruit quality among the varieties, with Solaris achieving the highest yields on the SO4 rootstock. In contrast, Riesling and Chardonnay required significant yield reduction to meet optimal technological parameters. The study also revealed that while rootstocks had a minimal impact on sugar content and acidity, these parameters were primarily driven by the cultivar. The research underscores the importance of selecting suitable rootstock-cultivar combinations to optimize both the quantity and quality of grape production in response to specific environmental conditions, particularly in the context of climate change. These findings contribute valuable insights into the management of grapevine cultivation in cooler regions, offering recommendations for vineyard management to improve wine production quality