Abstract
Abstract Water level declines in the Mississippi River Valley Alluvial Aquifer (MRVAA) are attributed largely to withdrawals for rice ( Oryza sativa L.) irrigation. This study was performed to determine if alternative irrigation strategies for rice could reduce withdrawal from the MRVAA without having an adverse effect on yield and profitability. Research was conducted at 19 on‐farm locations across the Delta region of Mississippi from 2014 through 2016 to determine the effects of irrigation water management practice, i.e., conventional flood via cascade (CONV), multiple side inlet (MSI), and MSI coupled with alternate wetting and drying (AWD), on aquifer withdrawal, rough rice grain yield, irrigation water use efficiency (IWUE), and net returns above irrigation costs. Compared to CONV and MSI, up to 39% less water was applied to AWD (P ˂ .0001). Rice grain yield for AWD was not different from either CONV or MSI (P = .1343), despite substantial reductions in water use. Relative to standard irrigation strategies, AWD maintained or increased net returns up to $238 ha −1 for pumping depths from 5.5 m to 122 m and diesel prices from $0.42 L −1 to $0.98 L −1 (P ≤ .0003). Irrigation water use efficiency was up to 59% greater for AWD relative to conventional systems due to the positive effects of the former on water use while maintaining yield (P = .0034). These data demonstrate that AWD can reduce withdrawal from the MRVAA while maintaining or improving yield and net returns relative to irrigation strategies currently employed across the midsouthern USA rice belt.
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Claims 4
Claim · model-written summary
AWD used up to 39% less water than CONV and MSI.
- Taxon
- rice
Oryza sativae1 - Treatment
- AWDe0
- Outcome
- water was appliede0
- Direction
- lesse0
- Value
- 39%e0
- Comparator
- CONV and MSIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared to CONV and MSI, up to 39% less water was applied to AWD (P ˂ .0001).”
e1“rice ( Oryza sativa L.)”
Claim · model-written summary
AWD rice grain yield did not differ from CONV or MSI.
- Taxon
- riceOryza sativae1
- Treatment
- AWDe0
- Outcome
- Rice grain yielde0
- Direction
- not differente0
- Comparator
- CONV or MSIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice grain yield for AWD was not different from either CONV or MSI (P = .1343)”
e1“rice ( Oryza sativa L.)”
Claim · model-written summary
AWD maintained or increased net returns by up to $238 ha −1 across the stated pumping depths and diesel prices.
- Taxon
- riceOryza sativae1
- Treatment
- AWDe0
- Outcome
- net returnse0
- Direction
- maintained or increasede0
- Value
- $238 ha −1e0
- Qualifier
- pumping depths from 5.5 m to 122 m and diesel prices from $0.42 L −1 to $0.98 L −1e0
- Comparator
- standard irrigation strategiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to standard irrigation strategies, AWD maintained or increased net returns up to $238 ha −1 for pumping depths from 5.5 m to 122 m and diesel prices from $0.42 L −1 to $0.98 L −1 (P ≤ .0003).”
e1“rice ( Oryza sativa L.)”
Claim · model-written summary
AWD increased irrigation water use efficiency by up to 59% relative to conventional systems.
- Taxon
- riceOryza sativae1
- Treatment
- AWDe0
- Outcome
- Irrigation water use efficiencye0
- Direction
- greatere0
- Value
- 59%e0
- Comparator
- conventional systemse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation water use efficiency was up to 59% greater for AWD relative to conventional systems”
e1“rice ( Oryza sativa L.)”
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See all 1,171 papers →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.