Effect of Deficit Irrigation on Yield Components and Chemical Composition of Albariño Grapes Grown in Galicia, NW Spain

In the context of climate change, water management is crucial for controlling reproductive growth and quality grapes. this study, we aim to determine effects different regimes on yield components chemical composition grape Vitis vinifera Albariño grown in Galicia. Four treatments were tested trial: rainfed (T0), irrigated at 30% ETo from veraison harvest (T1), pea-size (T2), throughout whole vegetative cycle (T6). To analyse irrigation, measures stem potential (Ψstem) obtained fortnightly, flowering harvest. During harvest, average weight per bunch number vine determined. addition, Ravaz index was also calculated. The grapes each experimental treatment subjected (OIV methods) volatile (GC-MS) analyses. results indicated a greater T0 group. lowest observed T2 over three years study. showed stronger influence year than must include parameters. Treatment affected malic acid, total acidity, free amino acids (FAN), assimilable yeast nitrogen (YAN); meanwhile, groups analysed, esters, acetates, by treatment, while season all families compounds, with exception C6 compounds. interaction effect Tr × Y concentration. contrast analysis (p < 0.05), increases alcohols terpenes T6 vs. T2; however, esters acetates increased under (T0) T6.