Abstract
Rescue N applications to corn ( Zea mays L ) may be needed when wet conditions prevent N applications or when the loss of applied N is suspected due to wet conditions. Crop injury when N is broadcast applied may counteract the yield benefits of a rescue N application. The objective of this research was to determine the effect of corn height, N placement, and source on injury and yield response. Five site‐years of research evaluated the impact of broadcast and between‐row placement of NH 4 NO 3 (AN), urea–NH 4 NO 3 (UAN), urea, and urea plus N‐( n ‐butyl) thiophosphoric triamide (NBPT), a urease inhibitor, at 170 kg N ha −1 either preplant or when the corn was 30, 60, 90, or 120 cm tall. Visual injury for broadcast‐applied N sources was ranked urea = urea plus NBPT < AN ≤ UAN 7 d after treatment. Injury was dependent on plant height. Leaf injury resulted in reduced yield when UAN or AN was broadcast on corn that was 60, 90, or 120 cm tall. Broadcast urea or urea plus NBPT caused minimal crop injury and effectively supplied N to the corn crop. Application of NBPT‐treated urea increased yield 260 kg ha −1 averaged across timings when compared with urea alone. Application when corn was 30 cm tall produced the highest yields, but excellent yield response to rescue N was obtained at all application heights. The placement and source of N should be considered when rescue N applications are made to corn >30 cm tall.
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Claims 7
Claim · model-written summary
Broadcast nitrogen sources ranked for injury as urea = urea plus NBPT < AN ≤ UAN.
Not reportedTaxon
Verbatim
e0“Visual injury for broadcast‐applied N sources was ranked urea = urea plus NBPT < AN ≤ UAN 7 d after treatment.”
Claim · model-written summary
Leaf injury reduced yield when UAN or AN was broadcast on 60, 90 or 120 cm corn.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- UAN or ANe0
- Outcome
- yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf injury resulted in reduced yield when UAN or AN was broadcast on corn that was 60, 90, or 120 cm tall.”
Claim · model-written summary
Broadcast urea caused minimal crop injury and supplied nitrogen effectively.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Broadcast ureae0
- Outcome
- crop injurye0
- Direction
- minimale0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broadcast urea or urea plus NBPT caused minimal crop injury and effectively supplied N to the corn crop.”
Claim · model-written summary
NBPT-treated urea increased yield by 260 kg ha −1 relative to urea alone.
- Treatment
- NBPT‐treated ureae0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 260 kg ha −1e0
- Comparator
- urea alonee0
Not reportedTaxon
Verbatim
e0“Application of NBPT‐treated urea increased yield 260 kg ha −1 averaged across timings when compared with urea alone.”
Claim · model-written summary
Application at 30 cm corn height produced the highest yields.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Application when corn was 30 cm talle0
- Outcome
- yieldse0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application when corn was 30 cm tall produced the highest yields”
Claim · model-written summary
Rescue nitrogen produced excellent yield responses at all application heights.
Not reportedTaxonComparator
Verbatim
e0“excellent yield response to rescue N was obtained at all application heights.”
Claim · model-written summary
The authors recommend considering placement and source when applying rescue nitrogen to corn over 30 cm tall.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- placement and source of N should be considerede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The placement and source of N should be considered when rescue N applications are made to corn >30 cm tall.”
The same questions in other papers
Zea mays subsp. mays · yield · Zea mays (maize)Results differ
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- positive
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1 in the opposite direction
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- no effect
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- positive
nitrogen · yield · Zea mays (maize)Positive and negative results
1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative
- no effect
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See all 2,185 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.