PT  - JOURNAL ARTICLE
AU  - R. E. Smart
TI  - Aspects of Water Relations of the Grapevine (Vitis Vinifera)
AID  - 10.5344/ajev.1974.25.2.84
DP  - 1974 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 84--91
VI  - 25
IP  - 2
4099  - http://www.ajevonline.org/content/25/2/84.short
4100  - http://www.ajevonline.org/content/25/2/84.full
SO  - Am J Enol Vitic.1974 Jan 01; 25
AB  - Diurnal patterns of leaf water potential (ψ) and stomatal resistance (rs) were investigated under different irrigation treatments and evaporative conditions. The ambient environment, especially solar radiation, had a dominating effect on leaf ψ. Water-stress-induced stomatal closure was observed at ψ of —13 bars, though shoot growth rate was inhibited before negative tensions became that large. Trunk diameter was very sensitive to water stress, even to hourly changes. Demonstrated as a simple yet effective indicator of water stress was the angle between the petiole and the lamina midrib.