INFLUÊNCIA DE MANEJOS DE IRRIGAÇÃO SOBRE ASPECTOS DE ECOFISIOLOGIA E DE PRODUÇÃO DA VIDEIRA CV. SYRAH / PAULSEN 1103

Abstract

Irrigation management may influence the ecophysiological behavior and yield of grapevine. The objective of this study was to evaluate the influence of different irrigation management strategies in leaf water potential, quantitative and qualitative aspects of grapes from the first growing season of cv. Syrah / Paulsen 1103 vineyard. The experiment was carried out at experimental field of Embrapa Tropical Semiarid, in Petrolina, Pernambuco State, Brazil. Plants were irrigated by drippers and irrigation depth was estimated based on crop evapotranspiration. The experimental design was a randomized block, with 4 replications, and with 3 treatments: full irrigation with water application throughout the growing season; deficit irrigation with water application interrupted in the pea-sized berries phase; and regulated deficit irrigation with irrigation also interrupted in the same phenological phase but eventually performed after that according to soil water monitoring. Plant water deficit has favored a higher sugar concentration and lower acidity in the berries which are desirable for winemaking.