Comparative Analysis of Nutritional Attributes in Karaerik and Kabuğu Yufka Grapevine Leaves Under Varying Bud Load

This study, investigated the effects of variety selection (Vitis vinifera cv. Karaerik and Kabugu Yufka) and bud load management (24, 36, 48, and 60 buds per vine) on the physiological and nutritional parameters of grapevine leaves over a two-year period. The research examined various leaf characteristics including dry matter content, ash content, acidity, pH, dietary fiber, vitamins C and E, total phenolic content, and macro and micromineral composition. The findings revealed significant differences among varieties across multiple parameters. Karaerik consistently demonstrated higher dry matter content, ash content, acidity, vitamin C levels, and generally superior macro and micronutrient concentrations. Conversely, Kabugu Yufka exhibited higher vitamin E content. Bud load treatments had varying effects, with some parameters, such as dry matter content and leaf acidity in the second year, showing significant responses to increased bud load. The study also observed year-to-year variations, with notable changes in vitamin C, total phenolic content, and mineral compositions between the two growing seasons. These findings’ consistent superiority of Karaerik in several nutritional aspects suggests its potential for producing higher quality grape leaves for culinary or nutraceutical purposes. However, the higher vitamin E content in Kabugu Yufka leaves indicates that variety choice may depend on specific nutritional targets. The varied responses to bud load treatments highlight the importance of tailored management strategies for each variety to maximize desired leaf characteristics.