Abstract
Corn ( Zea mays L.) production in the Southeast can be negatively impacted by erratic summer rainfall and drought-prone, coarse-textured soils, but irrigation combined with conservation tillage and cover crops may support greater plant densities arranged in different row configurations to improve yield. We examined five site-years of data across two soil types in Alabama to compare corn yields in a conservation system across three plant densities for single- and twin-row configurations in dryland and irrigated moisture regimes. Treatments were arranged with a split plot treatment restriction in a RCB design with three replications. Main plots were irrigation level (no irrigation and irrigation), and subplots were a factorial arrangement of three plant densities (5.9, 7.4, and 8.9 plants m −2 ) and row configurations (single and twin). A moisture environment (low and moderate) variable, defined by growing season rainfall, was used to average over site-years. In general, irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation. Benefits of increased rainfall and irrigation to reduce soil moisture stress across drought-prone soils were evident. Pooled results across all site-years indicated no yield response as plant density increased, but greater yields were observed with the greatest plant densities in the moderate-moisture environments. No advantage for twin-row corn production was observed across five site-years in Alabama, which indicates either row configuration can be successfully adopted.
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Claims 9
Claim · model-written summary
Irrigation in moderate moisture improved plant height relative to dryland low moisture.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- irrigation in the moderate-moisture environmente0
- Outcome
- plant heighte0
- Direction
- improvede0
- Comparator
- low-moisture environment with no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation.”
t0“Corn”
Claim · model-written summary
Irrigation in moderate moisture improved stover yield relative to dryland low moisture.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- irrigation in the moderate-moisture environmente0
- Outcome
- stover yielde0
- Direction
- improvede0
- Comparator
- low-moisture environment with no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation.”
t0“Corn”
Claim · model-written summary
Irrigation in moderate moisture improved corn yield relative to dryland low moisture.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- irrigation in the moderate-moisture environmente0
- Outcome
- corn yielde0
- Direction
- improvede0
- Comparator
- low-moisture environment with no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation.”
t0“Corn”
Claim · model-written summary
Irrigation in moderate moisture improved test weight relative to dryland low moisture.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- irrigation in the moderate-moisture environmente0
- Outcome
- test weighte0
- Direction
- improvede0
- Comparator
- low-moisture environment with no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation.”
t0“Corn”
Claim · model-written summary
Irrigation in moderate moisture decreased grain N concentration.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- irrigation in the moderate-moisture environmente0
- Outcome
- grain N concentratione0
- Direction
- decreasede0
- Comparator
- low-moisture environment with no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation.”
t0“Corn”
Claim · model-written summary
Irrigation in moderate moisture decreased aflatoxin levels.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- irrigation in the moderate-moisture environmente0
- Outcome
- aflatoxin levelse0
- Direction
- decreasede0
- Comparator
- low-moisture environment with no irrigatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation in the moderate-moisture environment improved each measured variable (plant height, stover yield, corn yield, and test weight) and decreased grain N concentration and aflatoxin levels compared to the low-moisture environment with no irrigation.”
t0“Corn”
Claim · model-written summary
Across all sites, increased density had no yield response.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- plant density increasede0
- Outcome
- yield responsee0
- Direction
- no yield responsee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pooled results across all site-years indicated no yield response as plant density increased, but greater yields were observed with the greatest plant densities in the moderate-moisture environments.”
t0“Corn”
Claim · model-written summary
The greatest plant densities gave greater yields in moderate-moisture environments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- greatest plant densitiese0
- Outcome
- yieldse0
- Direction
- greatere0
- Qualifier
- moderate-moisture environmentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pooled results across all site-years indicated no yield response as plant density increased, but greater yields were observed with the greatest plant densities in the moderate-moisture environments.”
t0“Corn”
Claim · model-written summary
Twin-row corn had no advantage across five Alabama site-years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- twin-rowe0
- Outcome
- corn productione0
- Direction
- No advantagee0
- Setting
- Alabamae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No advantage for twin-row corn production was observed across five site-years in Alabama”
t0“Corn”
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