Abstract

Global warming is a huge problem in the world. For that reason novadays determining the species which are resist for the water deficit and their water deficit mechanism’s are gradually having an importance. Plant and soil water potential measured by Scholander Pressure Chamber. This measurements are predawn leaf water potential Ψpd (2 hours before sunrise) and midday leaf water potential Ψmd (at 12:00-14:00 P.M.). Also water deficit consisting period (flowering, veraison, maturation, late maturation) is important. There is a significant case is defining optimal irrigation strategy in wine grapes. Water deficit effect on grape berry growing, berry development and berry quality is examined in this paper.