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.
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Claims 8
Claim · model-written summary
Daily lysimeter water use fell from about 40 to 22.3 L per vine.
Verbatim
e0“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”
Claim · model-written summary
Predawn leaf water potential was −0.075 MPa on August 24.
Not reportedTaxon
Verbatim
e0“Pre-dawn leaf water potential (ΨPD) and midday Ψl on August 24th were −0.075 and −0.76 MPa, respectively”
Claim · model-written summary
Midday leaf water potential declined from −0.76 to −1.28 MPa.
Not reportedTaxon
Verbatim
e0“midday Ψl on August 24th were −0.075 and −0.76 MPa, respectively, with midday Ψl decreasing to −1.28 MPa on September 2nd”
Claim · model-written summary
Leaf stomatal conductance decreased from about 500 to 200 mmol m−2 s−1.
Not reportedTaxon
Verbatim
e0“Leaf g s decreased from ~500 to ~200 mmol m−2 s−1 during the two dry-down periods”
Claim · model-written summary
Midday stomatal conductance and leaf water potential were significantly correlated (r = 0.96).
Not reportedTaxonDirection
Verbatim
e0“Midday measurements of g s and Ψl were significantly correlated with one another (r = 0.96)”
Claim · model-written summary
Both midday measures correlated significantly with relative daily water use (r about 0.9).
Not reportedTaxonDirection
Verbatim
e0“both with ETLYS/ETo (r = ~0.9)”
Claim · model-written summary
Leaf water potential, conductance and relative water use declined linearly with soil water content.
- Outcome
- decreases in Ψl, g s, and ETLYS/EToe0
- Direction
- decreasese0
- Setting
- volumetric soil water contente0
Not reportedTaxon
Verbatim
e0“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”
Claim · model-written summary
The authors conclude modest water stress can substantially reduce grapevine water use.
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“even modest water stress can greatly reduce grapevine water use”