Abstract
Abstract Water table control for both drainage and subirrigation holds potential benefit to crop production on many soils with imperfect drainage. Losses of soil NO ‐ 3 ‐N may occur through denitrification under partial anaerobic conditions such as would be encountered near a water table. In this 3‐year field study, four N rates were superimposed over three water table depths to test the effect of water table depth on corn ( Zea mays L.) response to N in a Chewacla silt loam (fine‐loamy, mixed, thermic Fluvaquentic Dystrochrepts). Water table depths were 0.35,0.70, and 1.00 m and N rates were 0,112,224, and 336 kg ha −1 . The effects of N fertilization depended on the water table depth. For the 3‐year means, quadratic regressions described the relationship between N rate and ear yield or leaf N for each water table depth except 1.00 m ear yield for which no response to N fertilizer was obtained. The N rate required for maximum ear yield or leaf N increased with decreasing water table depth. There were positive linear regressions of stover yields and soil NO ‐ 3 ‐N on N rate for each water table depth. With the 1.00 m water table, the N response slope was less for stover yield and greater for soil NO ‐ 3 ‐N than over the shallower water table depths. The lowest ear and stover yields were associated with deficient leaf N concentrations (< 27.5 g kg −1 ) where no N was added over the 0.35 and 0.70 m water table depths. The results suggest that soils with water tables within 0.70 m depth require more N fertilization to reach maximum corn yields than soils with deeper water tables.
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Claims 12
Claim · model-written summary
Nitrogen fertilization effects depended on water table depth.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- water table depthe0
- Outcome
- effects of N fertilizatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The effects of N fertilization depended on the water table depth.”
Claim · model-written summary
Ear yield responded quadratically to nitrogen at depths other than 1.00 m.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- ear yielde0
- Qualifier
- quadratic regressionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“quadratic regressions described the relationship between N rate and ear yield or leaf N for each water table depth except 1.00 m ear yield for which no response to N fertilizer was obtained.”
Claim · model-written summary
Leaf nitrogen responded quadratically to nitrogen rate at each water table depth.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- leaf Ne0
- Qualifier
- quadratic regressionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“quadratic regressions described the relationship between N rate and ear yield or leaf N for each water table depth except 1.00 m ear yield for which no response to N fertilizer was obtained.”
Claim · model-written summary
Ear yield did not respond to nitrogen fertilizer at 1.00 m water table depth.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- N fertilizere0
- Outcome
- ear yielde0
- Direction
- no responsee0
- Setting
- 1.00 me0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“except 1.00 m ear yield for which no response to N fertilizer was obtained.”
Claim · model-written summary
The nitrogen rate needed for maximum ear yield increased as water tables became shallower.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- N rate required for maximum ear yielde0
- Direction
- increasede0
- Comparator
- water table depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The N rate required for maximum ear yield or leaf N increased with decreasing water table depth.”
Claim · model-written summary
The nitrogen rate needed for maximum leaf nitrogen increased as water tables became shallower.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- N rate required for maximum ear yield or leaf Ne0
- Direction
- increasede0
- Comparator
- water table depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The N rate required for maximum ear yield or leaf N increased with decreasing water table depth.”
Claim · model-written summary
Stover yield increased linearly with nitrogen rate at each depth.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- stover yieldse0
- Direction
- positive lineare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“There were positive linear regressions of stover yields and soil NO ‐ 3 ‐N on N rate for each water table depth.”
Claim · model-written summary
Soil nitrate increased linearly with nitrogen rate at each depth.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- soil NO ‐ 3 ‐Ne0
- Direction
- positive lineare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“There were positive linear regressions of stover yields and soil NO ‐ 3 ‐N on N rate for each water table depth.”
Claim · model-written summary
At 1.00 m, the nitrogen response slope was lower for stover yield than at shallower depths.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- N response slope was less for stover yielde0
- Direction
- lesse0
- Comparator
- shallower water table depthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“With the 1.00 m water table, the N response slope was less for stover yield and greater for soil NO ‐ 3 ‐N than over the shallower water table depths.”
Claim · model-written summary
At 1.00 m, the nitrogen response slope was greater for soil nitrate than at shallower depths.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- soil NO ‐ 3 ‐Ne0
- Direction
- greatere0
- Comparator
- shallower water table depthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“With the 1.00 m water table, the N response slope was less for stover yield and greater for soil NO ‐ 3 ‐N than over the shallower water table depths.”
Claim · model-written summary
Lowest ear and stover yields occurred with deficient leaf nitrogen and no added nitrogen at shallow depths.
- Taxon
- CornZea mays subsp. mayst0
- Compound
- leaf Ne0
- Outcome
- ear and stover yieldse0
- Direction
- loweste0
- Value
- 27.5 g kg −1e0
- Qualifier
- where no N was added over the 0.35 and 0.70 m water table depthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The lowest ear and stover yields were associated with deficient leaf N concentrations (< 27.5 g kg −1 ) where no N was added over the 0.35 and 0.70 m water table depths.”
Claim · model-written summary
The authors recommend more nitrogen fertilization to maximize yields where water tables are within 0.70 m.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- more N fertilization to reach maximum corn yieldse0
- Comparator
- soils with deeper water tablese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“soils with water tables within 0.70 m depth require more N fertilization to reach maximum corn yields than soils with deeper water tables.”
The same questions in other papers
fertilization · yield · Zea mays (maize)Positive and negative results
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