Abstract
Irrigation is an important adaptation to reduce crop yield loss due to water stress from both soil water deficit (low soil moisture) and atmospheric aridity (high vapor pressure deficit, VPD). Traditionally, irrigation has primarily focused on soil water deficit. Observational evidence demonstrates that stomatal conductance is co-regulated by soil moisture and VPD from water supply and demand aspects. Here we use a validated hydraulically-driven ecosystem model to reproduce the co-regulation pattern. Specifically, we propose a plant-centric irrigation scheme considering water supply-demand dynamics (SDD), and compare it with soil-moisture-based irrigation scheme (management allowable depletion, MAD) for continuous maize cropping systems in Nebraska, United States. We find that, under current climate conditions, the plant-centric SDD irrigation scheme combining soil moisture and VPD, could significantly reduce irrigation water use (-24.0%) while maintaining crop yields, and increase economic profits (+11.2%) and irrigation water productivity (+25.2%) compared with MAD, thus SDD could significantly improve water sustainability.
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Claims 6
Claim · model-written summary
Stomatal conductance was co-regulated by soil moisture and vapor pressure deficit in observations.
Not reportedTaxonDirection
Verbatim
e0“Observational evidence demonstrates that stomatal conductance is co-regulated by soil moisture and VPD from water supply and demand aspects”
Claim · model-written summary
The hydraulic ecosystem model reproduced stomatal co-regulation.
- Outcome
- co-regulation patterne0
Not reportedTaxonComparatorValue
Verbatim
e0“Here we use a validated hydraulically-driven ecosystem model to reproduce the co-regulation pattern”
Claim · model-written summary
SDD irrigation reduced maize irrigation water use by -24.0% versus MAD.
- Treatment
- plant-centric SDD irrigation schemee0
- Outcome
- irrigation water usee0
- Direction
- reducee0
- Value
- -24.0%e0
- Comparator
- MADe0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant-centric SDD irrigation scheme combining soil moisture and VPD, could significantly reduce irrigation water use (-24.0%) while maintaining crop yields, and increase economic profits (+11.2%) and irrigation water productivity (+25.2%) compared with MAD”
e1“continuous maize cropping systems in Nebraska, United States”
Claim · model-written summary
SDD irrigation maintained maize crop yields versus MAD.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant-centric SDD irrigation scheme combining soil moisture and VPD, could significantly reduce irrigation water use (-24.0%) while maintaining crop yields, and increase economic profits (+11.2%) and irrigation water productivity (+25.2%) compared with MAD”
e1“continuous maize cropping systems in Nebraska, United States”
Claim · model-written summary
SDD irrigation increased economic profits by +11.2% versus MAD.
- Treatment
- plant-centric SDD irrigation schemee0
- Outcome
- economic profitse0
- Direction
- increasee0
- Value
- +11.2%e0
- Comparator
- MADe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant-centric SDD irrigation scheme combining soil moisture and VPD, could significantly reduce irrigation water use (-24.0%) while maintaining crop yields, and increase economic profits (+11.2%) and irrigation water productivity (+25.2%) compared with MAD”
e1“continuous maize cropping systems in Nebraska, United States”
Claim · model-written summary
SDD irrigation increased irrigation water productivity by +25.2% versus MAD.
- Treatment
- plant-centric SDD irrigation schemee0
- Outcome
- irrigation water productivitye0
- Direction
- increasee0
- Value
- +25.2%e0
- Comparator
- MADe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the plant-centric SDD irrigation scheme combining soil moisture and VPD, could significantly reduce irrigation water use (-24.0%) while maintaining crop yields, and increase economic profits (+11.2%) and irrigation water productivity (+25.2%) compared with MAD”
e1“continuous maize cropping systems in Nebraska, United States”
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