Abstract
Efficient use of fertilizer inputs in corn production is a major concern with corn producers in keeping costs to a minimum. Selecting an efficient system to utilize nitrogen fertilizers would address application methods, formulation, tillage, climate, and cropping history. Another factor is the variation between genotypic response of corn hybrids to nitrogen. This study was designed to examine six hybrids at eight nitrogen treatments while previous studies have utilized two or three regimes. Three of the N treatments used in this experiment were split into a preplant treatment with 67 kg N ha('-1) of the total amount applied just prior to tasseling. Grain and stover yield and N content was examined to determine overall nitrogen use efficiency and uptake and utilization characteristics during the growing season. The overall efficiency of nitrogen use declined as nitrogen rates were increased in all hybrids, but two hybrids exhibited the inability to translate increased rates of applied nitrogen into increased grain yield. Differences in nitrogen uptake and utilization characteristics existing between corn hybrids may not be pronounced enough with existing genotypes to manage except in high nitrogen loss situations. A second study was conducted with twenty hybrids to attempt to evaluate their responsiveness to applied N and split applications of N. The hybrids used in general responded to increasing N rates at both locations. Split applications of N did not result in increased yields at either location. In summary, this work has shown that some differences do exist between commercial hybrids currently being grown as to their response to applied N.
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Claims 5
Claim · model-written summary
Nitrogen use efficiency declined as nitrogen rates rose across all corn hybrids.
- Taxon
- CORN
Zea mays subsp. mayst0 - Treatment
- nitrogen ratese0
- Outcome
- efficiency of nitrogen usee0
- Direction
- declinede0
- Qualifier
- all hybridse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The overall efficiency of nitrogen use declined as nitrogen rates were increased in all hybrids”
t0“CORN”
Claim · model-written summary
Two corn hybrids did not convert increased nitrogen application into increased grain yield.
- Taxon
- CORNZea mays subsp. mayst0
- Material
- two hybridse0
- Treatment
- increased rates of applied nitrogene0
- Outcome
- grain yielde0
- Direction
- inability to translatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“two hybrids exhibited the inability to translate increased rates of applied nitrogen into increased grain yield”
t0“CORN”
Claim · model-written summary
In the second study, hybrids generally responded to increasing nitrogen rates at both locations.
- Taxon
- CORNZea mays subsp. mayst0
- Treatment
- increasing N ratese0
- Outcome
- respondede0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The hybrids used in general responded to increasing N rates at both locations.”
t0“CORN”
Claim · model-written summary
Split nitrogen applications did not increase yields at either location.
- Taxon
- CORNZea mays subsp. mayst0
- Treatment
- Split applications of Ne0
- Outcome
- yieldse0
- Direction
- did not result in increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Split applications of N did not result in increased yields at either location.”
t0“CORN”
Claim · model-written summary
Commercial corn hybrids differed in their response to applied nitrogen.
- Taxon
- CORNZea mays subsp. mayst0
- Material
- commercial hybridse0
- Outcome
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some differences do exist between commercial hybrids currently being grown as to their response to applied N”
t0“CORN”
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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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.