Abstract
The influence of irrigation frequency and the severity and rate of development of soil water deficits on the vegetative growth and water status of carrots (Daucus carota L. var. sativa DC.) grown for seed were investigated in a fine sandy loam soil. Beginning with the period of rapid development of primary umbels, various irrigation frequencies [daily vs. intervals corresponding to 30 mm of accumulated crop evapotranspiration (ET c )] were investigated at irrigation rates ranging from 40% to 120% of estimated ETC. The magnitude and rate of development of soil water deficits markedly influenced carrot responses to developing water deficits. Stomata] conductance and leaf water potential (LWP) measurements exhibited some potential for use in irrigation scheduling and were the most sensitive and consistent indicators of plant water status. Under low-frequency continuous-deficit irrigation, a combination of moderate reductions in stomatal conductance and major reductions in peak leaf area and late-season maintenance of viable leaf area occurred. These responses were effective water-conserving mechanisms, allowing growth at a reduced rate and continued development of viable seed. In contrast, rapid development of soil water deficits resulted in nearly complete stomatal closure, cessation of growth, and rapid reductions in leaf area.
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Claims 9
Claim · model-written summary
Magnitude and rate of soil water deficit development influenced carrot responses.
- Taxon
- carrot
Daucus carotae0 - Treatment
- soil water deficitse0
- Outcome
- carrot responsese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The magnitude and rate of development of soil water deficits markedly influenced carrot responses to developing water deficits.”
Claim · model-written summary
Stomatal conductance and leaf water potential were the most sensitive and consistent water-status indicators.
- Taxon
- carrotDaucus carotat0
- Outcome
- indicators of plant water statuse0
- Direction
- most sensitive and consistente0
- Qualifier
- irrigation schedulinge0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomata] conductance and leaf water potential (LWP) measurements exhibited some potential for use in irrigation scheduling and were the most sensitive and consistent indicators of plant water status.”
t0“Seed Carrot”
Claim · model-written summary
Low-frequency continuous-deficit irrigation moderately reduced stomatal conductance.
- Taxon
- carrotDaucus carotat0
- Treatment
- low-frequency continuous-deficit irrigatione0
- Outcome
- stomatal conductancee0
- Direction
- reductionse0
- Qualifier
- moderatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low-frequency continuous-deficit irrigation, a combination of moderate reductions in stomatal conductance and major reductions in peak leaf area and late-season maintenance of viable leaf area occurred.”
t0“Seed Carrot”
Claim · model-written summary
Low-frequency continuous-deficit irrigation greatly reduced peak leaf area.
- Taxon
- carrotDaucus carotat0
- Treatment
- low-frequency continuous-deficit irrigatione0
- Outcome
- peak leaf areae0
- Direction
- reductionse0
- Qualifier
- majore0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low-frequency continuous-deficit irrigation, a combination of moderate reductions in stomatal conductance and major reductions in peak leaf area and late-season maintenance of viable leaf area occurred.”
t0“Seed Carrot”
Claim · model-written summary
Low-frequency continuous-deficit irrigation maintained viable late-season leaf area.
- Taxon
- carrotDaucus carotat0
- Treatment
- low-frequency continuous-deficit irrigatione0
- Outcome
- viable leaf areae0
- Direction
- maintenancee0
- Qualifier
- late-seasone0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under low-frequency continuous-deficit irrigation, a combination of moderate reductions in stomatal conductance and major reductions in peak leaf area and late-season maintenance of viable leaf area occurred.”
t0“Seed Carrot”
Claim · model-written summary
These water-conserving responses allowed reduced-rate growth and viable seed development.
- Taxon
- carrotDaucus carotat0
- Outcome
- growth at a reduced rate and continued development of viable seede0
- Qualifier
- water-conserving mechanismse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses were effective water-conserving mechanisms, allowing growth at a reduced rate and continued development of viable seed.”
t0“Seed Carrot”
Claim · model-written summary
Rapid deficit development caused nearly complete stomatal closure.
- Taxon
- carrotDaucus carotat0
- Treatment
- rapid development of soil water deficitse0
- Outcome
- stomatal closuree0
- Direction
- nearly completee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid development of soil water deficits resulted in nearly complete stomatal closure, cessation of growth, and rapid reductions in leaf area.”
t0“Seed Carrot”
Claim · model-written summary
Rapid deficit development stopped growth.
- Taxon
- carrotDaucus carotat0
- Treatment
- rapid development of soil water deficitse0
- Outcome
- cessation of growthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid development of soil water deficits resulted in nearly complete stomatal closure, cessation of growth, and rapid reductions in leaf area.”
t0“Seed Carrot”
Claim · model-written summary
Rapid deficit development rapidly reduced leaf area.
- Taxon
- carrotDaucus carotat0
- Treatment
- rapid development of soil water deficitse0
- Outcome
- leaf areae0
- Direction
- reductionse0
- Qualifier
- rapide0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rapid development of soil water deficits resulted in nearly complete stomatal closure, cessation of growth, and rapid reductions in leaf area.”
t0“Seed Carrot”
The same questions in other papers
irrigation · growth · Daucus carota (carrot)Results differ
7 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- negative
- positive
6 papers more in this group
See all 10 papers →drought · growth · Daucus carota (carrot)Positive and negative results
4 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 papers →drought · physiology: gas exchange · Daucus carota (carrot)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.