REDUCING NITROGEN FERTILIZATION ALTERS PHENOLIC PROFILES OF VITIS VINIFERA L. CV. CABERNET GERNISCHT WINE OF YANTAI, CHINA
Nitrogen (N) fertilizer is important for grape growth and the quality of wine. It is essential to address the mismatch between N application and wine composition. Cabernet Gernischt (Vitis vinifera L.), as one of the main wine-grape cultivars in China, was introduced to Yantai wine region in 1892. This grape cultivar is traditionally used for quality dry red wine with fruit, spices aroma, ruby red and full-bo-died wines. In order to regulate vine growth and improve grape and wine quality, Cabernet Gernischt grapevines were subjected to decreased levels of N treatments, compared to normal N supply treatment, during grape growing seasons of 2019 and 2020. Three N application treatments were imposed from leaf development to verasion: The normal N treatment corresponding to the control (N2), reducing N application by half treatment and no N application treatment corresponding to N1 and N0, respectively. Individual phenolics were determined by UHPLC-MS/MS. The result showed that reducing N had si-gnificantly decreased shoot pruning weight and yield, but the effect on fruit ripening was depending on season. N reduction treatment significantly improved wine phenolic parameters including total pheno-lic, tannnins and anthocyanins, and enhanced most of individual anthocyanins, and some non-antho-cyanin phenolics especially stibenes including piceatannol, trans-resveratrol and polydatin, regardless of season. The overall results highlighted the importance of reducing N application during grape growing season in modifying wine phenolic profiles.
Issue: OENO Macrowine 2023
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Cabernet Gernischt, Vitis vinifera, Nitrogen, Phenolic composition