Abstract
Abstract Scheduling irrigation events is important for high corn ( Zea mays L.) yield, water use efficiency, economic returns, and water conservation. The use of shallow subsurface drip irrigation (S3DI) is cost effective for small irregular shaped field areas. Currently there are no irrigation scheduling recommendations for S3DI systems for corn production. The objective was to evaluate three water potential value strategies for scheduling irrigation events and the effect on corn yield, test weight, irrigation water use efficiency (IWUE), and value water use efficiency (VWUE). Corn was grown multiple years (2012–2013; 2019–2023) at two locations (Dawson and Shellman, GA) using soil water potential sensors to schedule irrigation events. Sensors were installed at 10 and 20 inches (25 and 50 cm) soil depth. Irrigation events were scheduled when the average water potential was between 40 to 60 cbar (I1), 60 to 80 cbar (I2), 80 to 100 cbar (I3), and compared to a dryland control (I0). There was no difference in corn yield, IWUE, or VWUE between irrigation treatments, but all irrigation treatments had greater yield than I0, except in high rainfall years. At the Shellman location, total water applied for I3 was 46% less than for I1. At Dawson, I2 applied 17% more water than either I1 or I3. Across both sites, I1 and I2 applied 1.5 and 1.3 times more water than I3, respectively. Therefore, irrigation events scheduled at 80 to 100 cbar can be a viable technique for irrigating corn using S3DI without yield reductions while promoting water conservation.
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Claims 9
Claim · model-written summary
Corn yield did not differ among irrigation scheduling treatments.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- irrigation treatmentse0
- Outcome
- corn yielde0
- Direction
- no differencee0
- Comparator
- irrigation treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in corn yield, IWUE, or VWUE between irrigation treatments, but all irrigation treatments had greater yield than I0, except in high rainfall years.”
Claim · model-written summary
IWUE did not differ among irrigation scheduling treatments in corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- irrigation treatmentse0
- Outcome
- IWUEe0
- Direction
- no differencee0
- Comparator
- irrigation treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in corn yield, IWUE, or VWUE between irrigation treatments, but all irrigation treatments had greater yield than I0, except in high rainfall years.”
Claim · model-written summary
VWUE did not differ among irrigation scheduling treatments in corn.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- irrigation treatmentse0
- Outcome
- VWUEe0
- Direction
- no differencee0
- Comparator
- irrigation treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in corn yield, IWUE, or VWUE between irrigation treatments, but all irrigation treatments had greater yield than I0, except in high rainfall years.”
Claim · model-written summary
Irrigation treatments increased corn yield versus the dryland control except in high rainfall years.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- irrigation treatmentse0
- Outcome
- yielde0
- Direction
- greatere0
- Qualifier
- except in high rainfall yearse0
- Comparator
- I0e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no difference in corn yield, IWUE, or VWUE between irrigation treatments, but all irrigation treatments had greater yield than I0, except in high rainfall years.”
Claim · model-written summary
At Shellman, I3 used 46% less water than I1.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- I3e0
- Outcome
- total water appliede0
- Direction
- lesse0
- Value
- 46%e0
- Comparator
- I1e0
- Setting
- Shellmane0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the Shellman location, total water applied for I3 was 46% less than for I1.”
t0“corn”
Claim · model-written summary
At Dawson, I2 used 17% more water than I1 or I3.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- I2e0
- Outcome
- watere0
- Direction
- moree0
- Value
- 17%e0
- Comparator
- I1 or I3e0
- Setting
- Dawsone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Dawson, I2 applied 17% more water than either I1 or I3.”
t0“corn”
Claim · model-written summary
Across sites, I1 used 1.5 times as much water as I3.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across both sites, I1 and I2 applied 1.5 and 1.3 times more water than I3, respectively.”
t0“corn”
Claim · model-written summary
Across sites, I2 used 1.3 times as much water as I3.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- I2e0
- Outcome
- watere0
- Direction
- moree0
- Value
- 1.3 timese0
- Comparator
- I3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across both sites, I1 and I2 applied 1.5 and 1.3 times more water than I3, respectively.”
t0“corn”
Claim · model-written summary
The authors recommend scheduling S3DI irrigation at 80 to 100 cbar for corn water conservation without yield loss.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- irrigation events scheduled at 80 to 100 cbare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Therefore, irrigation events scheduled at 80 to 100 cbar can be a viable technique for irrigating corn using S3DI without yield reductions while promoting water conservation.”
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