Efeito da rega deficitária no vigor, produção e qualidade da casta Alvarinho (Vitis vinifera L.) na Região dos Vinhos Verdes

Mestrado em Viticultura e Enologia - Instituto Superior de Agronomia / Faculdade de Ciências. Universidade do PortoThe purpose of this work was to compare the effects of four strategies of deficit irrigation and analyse the differences of physiology, vegetative growth, yield and quality of grapes of Alvarinho. The study was performed in 2014, at Quinta da Aveleda, located in the Vinhos Verdes region, in Penafiel. So the following treatments were tested: not watered control (R0), without any intervention; irrigation based on leaf water potential (R1); irrigation with 75% ETc (R2) and irrigation with 100% ETc (R3). The evolution of the basic leaf water potential has shown that the vines were always in water comfort. Irrigation with 100% Etc presented higher total leaf area but didin’t obtain a high production. Regarding the composition of the must in the vintage, the modalities apparently showed similar values, resulting in more efficient use of irrigation water. This was a year with atypical weather conditions, registering a lot of rainfall during the summer months. So the results shouldn’t be extrapolated for future years