Abstract
Abstract Residual profile NO 3 significantly affects crop N fertilizer requirements in semiarid regions, but little information is available on the influence of profile NO 3 on crop response to applied N in humid climates. Experiments were conducted on three well‐drained silt loam soils to investigate profile NO 3 accumulation and retention and to determine the effect of profile NO 3 ‐N on corn ( Zea mays L.) response to applied N under humid climatic conditions. In 1983, spring preplant N (0, 134, 268, or 402 kg N ha −1 ) was applied to corn at each location. Fall 1983 profile NO 3 ‐N to 90 or 120 cm was linearly related to 1983 N rate and ranged from 52 to 644 kg N ha −1 . Overwinter retention of fall profile NO 3 ‐N varied from 45 to 66% among locations in a year with above normal fall to spring precipitation. Original plots at all locations were split in 1984, and preplant N rates of 0, 78, 156 or 234 kg N ha −1 were superimposed on each 1983 N treatment. Corn yields in the absence of applied N and yield response to added N were significantly affected by spring profile NO 3 ‐N content. With no applied N, profile NO 3 ‐N to 90 cm accounted for 84% of the variation in yield at the most responsive site. Grain yields were maximized (8.5 to 9.5 Mg ha −1 ) in the absence of applied N where profile NO 3 ‐N to 90 cm was >150 kg N ha −1 . Similarly, yields were not increased by applied N where profile NO 3 ‐N exceeded 150 kg N ha −1 . These results indicate that profile NO 3 ‐N significantly affects corn response to applied N on some Wisconsin soils. Adjustment of N recommendations for profile NO 3 ‐N should allow more accurate prediction of corn N fertilizer requirements on these soils when substantial overwinter carryover of profile NO 3 ‐N occurs.
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Claims 7
Claim · model-written summary
Fall 1983 profile nitrate-N to 90 or 120 cm was linearly related to the 1983 N rate applied to corn and ranged from 52 to 644 kg N ha −1.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- 1983 N ratee0
- Outcome
- Fall 1983 profile NO 3 ‐Ne0
- Direction
- increaseinferrede0
- Value
- 52 to 644 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Fall 1983 profile NO 3 ‐N to 90 or 120 cm was linearly related to 1983 N rate and ranged from 52 to 644 kg N ha −1”
Claim · model-written summary
Overwinter retention of fall profile nitrate-N varied from 45 to 66% among locations in a year with above normal fall to spring precipitation.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Overwinter retention of fall profile NO 3 ‐Ne0
- Value
- 45 to 66%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Overwinter retention of fall profile NO 3 ‐N varied from 45 to 66% among locations”
Claim · model-written summary
Corn yields without applied N and the yield response to added N were significantly affected by spring profile nitrate-N content.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- spring profile NO 3 ‐N contente0
- Outcome
- Corn yields in the absence of applied N and yield response to added Ne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Corn yields in the absence of applied N and yield response to added N were significantly affected by spring profile NO 3 ‐N content”
Claim · model-written summary
With no applied N, profile nitrate-N to 90 cm accounted for 84% of the variation in corn yield at the most responsive site.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- profile NO 3 ‐N to 90 cme0
- Outcome
- variation in yielde0
- Value
- 84%e0
- Setting
- the most responsive sitee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“With no applied N, profile NO 3 ‐N to 90 cm accounted for 84% of the variation in yield at the most responsive site”
Claim · model-written summary
Corn grain yields were maximized at 8.5 to 9.5 Mg ha −1 without applied N where profile nitrate-N to 90 cm was above 150 kg N ha −1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- profile NO 3 ‐N to 90 cm was >150 kg N ha −1e0
- Outcome
- Grain yieldse0
- Direction
- maximizede0
- Value
- 8.5 to 9.5 Mg ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Grain yields were maximized (8.5 to 9.5 Mg ha −1 ) in the absence of applied N where profile NO 3 ‐N to 90 cm was >150 kg N ha −1”
Claim · model-written summary
Corn yields were not increased by applied N where profile nitrate-N exceeded 150 kg N ha −1.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- applied Ne0
- Outcome
- yieldse0
- Direction
- not increasede0
- Qualifier
- profile NO 3 ‐N exceeded 150 kg N ha −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“yields were not increased by applied N where profile NO 3 ‐N exceeded 150 kg N ha −1”
Claim · model-written summary
Adjusting N recommendations for profile nitrate-N should allow more accurate prediction of corn N fertilizer requirements on these soils.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- more accurate prediction of corn N fertilizer requirementse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Adjustment of N recommendations for profile NO 3 ‐N should allow more accurate prediction of corn N fertilizer requirements on these soils”
The same questions in other papers
nitrogen · yield · Zea mays (maize)Positive and negative results
278 papers in the same direction as this paper · 1,906 in the opposite direction
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