Predawn Leaf Water Potential and Soil Water Content in Vertical Trellis Under Irrigated and Non-Irrigated Conditions in Tempranillo Grapevines

Relationship between Soil and Plant Water Status in Wine Grapes under Various Water Deficit Regimes

“…Y em and Y md were slightly better correlated to Y 0-1.2 than Y pd , which indicated that plant water status is more responsive to soil water availability when the atmospheric demand is high (Williams and Araujo, 2002;Yuste et al, 2004). However, Cifré et al (2005), Deloire et al (2004), and Yuste et al (1999) obtained a good relationship between Y pd and the water status of the fraction of soil explored by roots. The lower slope of the regression line between Y 0-1.2 and Y pd (Fig.…”

“…Leaf water potential (Y l ) measured at different times of the day (predawn and during the day) is often used to determine plant water status. Leaf water potential measured at predawn (Y pd ), when leaf stomata are closed, has been found to be significantly related to soil water status in grapevine under various crop conditions (Deloire et al, 2004;Medrano et al, 2003;van Leeuwen et al, 2001;Yuste et al, 1999). However, Williams (2002) pointed out that Y pd does not accurately reflect vine water status under water stress because non-irrigated plants sometimes have similar values to their irrigated counterparts due to rehydration during the night.…”

Caracterización geométrica, ecofisiológica y evaluación agronómica de sistemas continuos de vegetación libre (SPRAWL) vs. espaldera para atenuar la sobreexposición de hojas de racimos en cv. syrah (Vitis vinifera L.) en viñedos de zonas cálidas

“…Girona (1993) y Choné et al (2001) encontraron que existe una relación directa entre el Ψ aa y la reserva útil de la fracción de suelo explorada por las raíces. Yuste et al, (1999) encontraron una relación lineal directa entre el Ψ aa y el potencial matricial del suelo.…”