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R.B. Hutmacher, J.J. Steiner, J.E. Ayars, A.B. Mantel, and S.S. Vail

Abbreviations: ET c , crop evapotranspiration; DOY, day of year; K c , crop coefficient; LWP, leaf water potential; RWC, leaf relative water content; VPD, air vapor pressure deficit. 1 Plant Physiologist. 2 Agronomist. 3 Agricultural Engineer. 4

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Horst W. Caspari, M. Hossein Behhoudian, David J. Chalmers, and A. Richard Renquist

Abbreviations: DAFB, days after full bloom; DC, drying cycle; E pan , potential water use measured from a Class A pan; ET, evapotranspiration; k c , crop coefficient; WU, water use; Ψ 1 , leaf water potential. 2 Senior Lecturer. 3 Professor. Current

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Thayne Montague and Lindsey Fox

( Hinckley et al., 1978 ) and growth. Transplanted trees are considered to be established when leaf water potential (ψ L ), gas exchange, and growth are similar to those of nontransplanted trees ( Beeson and Gilman, 1992 ). However, research on gas exchange

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José Luis Chaves-Gómez, Alba Marina Cotes-Prado, Sandra Gómez-Caro, and Hermann Restrepo-Díaz

, y i   and y i + 1 are the values of the severity scale that were obtained at every evaluation time, and ( t i + 1 − t i ) is the time interval between evaluations. g S and leaf water potential. g S and leaf water potential (Ψ wf ) were

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Ozlem Altuntas, H. Yildiz Dasgan, and Yelderem Akhoundnejad

µmol·s −1 ). Leaf water potential. Leaf water potential was measured on young, fully expanded leaves, nine leaves from each replicate, on the same day that observations of gas exchange parameters were made (on the third or fourth leaves from the plant

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Kimberly Moore, Charles Wajsbrot, Cristina Burgart, and Luci Fisher

, medium, or high salt-tolerant. We monitored changes in leaf water potential and plant quality of sea hibiscus, a high salt-tolerant plant, exposed to increasing EC and Na levels. Because measuring water potential is impractical for a grower, for

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Carlos Vinicius Garcia Barreto, Rhuanito Soranz Ferrarezi, Flávio Bussmeyer Arruda, and Roberto Testezlaf

; leaf water potential at 36, 55, 67, 75, and 90 DAS; and leaf temperature, transpiration, and stomatal resistance at 36, 55, and 90 DAS. We sampled three plants per plot for each sampling date. The gaseous exchange measurements from the porometer LI-1600

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Tessa M. Mills, Jianming Li, and M. Hossein Behboudian

all the water used for any given 24-h period. However, Gucci et al. (1997) reported that A. deliciosa does not demonstrate low midday leaf water potential values under water deficit as effective stomatal closure allows water conservation. But

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Francisco García-Sánchez and James P. Syvertsen

-watered citrus leaves reduces net assimilation of CO 2 (A CO2 ) by a direct biochemical inhibition of photosynthetic capacity rather by decreases in stomatal conductance ( g s ) or leaf water potential ( García-Sánchez et al., 2006 ; Levy and Syvertsen, 2004

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Amos Naor, Isaac Klein, and Israel Doron

The sensitivity of leaf (ψleaf) and stem (ψstem) water potential and stomatal conductance (gs) to soil moisture availability in apple (Malus domestics Borkh.) trees and their correlation with yield components were studied in a field experiment. Two drip irrigation treatments, 440 mm (H) and 210 mm (L), were applied to a `Golden Delicious' apple orchard during cell enlargement stage (55-173 days after full bloom). Data collected included ψstem, y leaf, gs, and soil water potential at 25 (ψsoil-25) and 50 cm (ψsoil-50). No differences in midday ψleaf's were found between irrigation treatments. Stem water potential was higher in the H treatment than in the L treatment in diurnal measurements, and at midday throughout the season. Stomatal conductance of the H treatment was higher than the L treatment throughout the day. Stomatal conductance between 0930 and 1530 hr were highly correlated with ψstem. The H treatment increased the percentage of fruit >65 mm, and increased the proportion of earlier harvested fruit reaching marketable size compared to the L treatment. Fruit size in the first harvest and the total yield were highly correlated with ψstem. The degree of correlation between plant water stress indicators and yield component decreased in the following order: ψstemsoil-25,soil-50leaf. The data suggest that midday ψstem may serve as a preferable plant water stress indicator with respect to fruit size.