Midday measurements of leaf water potential and stomatal conductance are highly correlated with daily water use of Thompson Seedless grapevines

Williams, L.E. and Baeza Trujillo, Pilar and Vaughn, P. (2011). Midday measurements of leaf water potential and stomatal conductance are highly correlated with daily water use of Thompson Seedless grapevines. "Irrigation Science", v. 30 (n. 3); pp. 201-212. ISSN 0342-7188. https://doi.org/10.1007/s00271-011-0276-2.

Description

Title: Midday measurements of leaf water potential and stomatal conductance are highly correlated with daily water use of Thompson Seedless grapevines
Author/s:
  • Williams, L.E.
  • Baeza Trujillo, Pilar
  • Vaughn, P.
Item Type: Article
Título de Revista/Publicación: Irrigation Science
Date: May 2011
ISSN: 0342-7188
Volume: 30
Subjects:
Faculty: E.U.I.T. Agrícolas (UPM)
Department: Producción Vegetal: Fitotecnia [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A study was conducted to determine the relationship between midday measurements of vine water status and daily water use of grapevines measured with a weighing lysimeter. Water applications to the vines were terminated on August 24th for 9 days and again on September 14th for 22 days. Daily water use of the vines in the lysimeter (ETLYS) was approximately 40 L vine−1 (5.3 mm) prior to turning the pump off, and it decreased to 22.3 L vine−1 by September 2nd. Pre-dawn leaf water potential (ΨPD) and midday Ψl on August 24th were −0.075 and −0.76 MPa, respectively, with midday Ψl decreasing to −1.28 MPa on September 2nd. Leaf g s decreased from ~500 to ~200 mmol m−2 s−1 during the two dry-down periods. Midday measurements of g s and Ψl were significantly correlated with one another (r = 0.96) and both with ETLYS/ETo (r = ~0.9). The decreases in Ψl, g s, and ETLYS/ETo in this study were also a linear function of the decrease in volumetric soil water content. The results indicate that even modest water stress can greatly reduce grapevine water use and that short-term measures of vine water status taken at midday are a reflection of daily grapevine water use

More information

Item ID: 12062
DC Identifier: http://oa.upm.es/12062/
OAI Identifier: oai:oa.upm.es:12062
DOI: 10.1007/s00271-011-0276-2
Official URL: http://www.springerlink.com/content/16g60x6v18828764/
Deposited by: Memoria Investigacion
Deposited on: 14 Sep 2012 10:32
Last Modified: 21 Apr 2016 11:14
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