Abstract
Abstract From 2002 to date, a long-term field experiment has been conducted at Lake Carl Blackwell, Oklahoma, with different rates and times of nitrogen (N) fertilizer application to determine their effect on grain yield, protein and N uptake of winter wheat. Trend analysis for N rates (0, 50, 100, 150 and 200 kg N ha−1) and orthogonal contrasts for different application times (pre-plant, top-dressed in February and March) were performed. With increasing fertilizer N, wheat grain yield and protein content increased from 2110 kg ha−1 to 6783 kg ha−1 and from 8.96 to 17.19%, respectively. For grain yield, protein, and N use efficiency, split applications of N fertilizer were much more efficient than applying all N pre-plant. Large differences in grain yields were noted for different years at the same N rate (range exceeded 5.0 Mg ha−1) and that illustrated the need for making within-year-specific N rate recommendations. Keywords: nitrogennitrogen uptakeproteintime of applicationwinter wheat
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Claims 5
Claim · model-written summary
Increasing fertilizer N raised winter wheat grain yield from 2110 to 6783 kg/ha.
- Taxon
- winter wheat
Triticum aestivume1 - Treatment
- increasing fertilizer Ne2
- Outcome
- wheat grain yielde2
- Direction
- increasede2
- Value
- 2110 kg ha−1 to 6783 kg ha−1e2
- Setting
- Lake Carl Blackwell, Oklahomae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lake Carl Blackwell, Oklahoma”
e1“grain yield, protein and N uptake of winter wheat”
e2“With increasing fertilizer N, wheat grain yield and protein content increased from 2110 kg ha−1 to 6783 kg ha−1 and from 8.96 to 17.19%, respectively”
Claim · model-written summary
Increasing fertilizer N raised winter wheat protein content from 8.96% to 17.19%.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- increasing fertilizer Ne2
- Outcome
- protein contente2
- Direction
- increasede2
- Value
- 8.96 to 17.19%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lake Carl Blackwell, Oklahoma”
e1“grain yield, protein and N uptake of winter wheat”
e2“With increasing fertilizer N, wheat grain yield and protein content increased from 2110 kg ha−1 to 6783 kg ha−1 and from 8.96 to 17.19%, respectively”
Claim · model-written summary
Split N applications were more efficient than applying all N pre-plant for grain yield, protein and N use efficiency.
- Taxon
- winter wheatTriticum aestivume1
- Treatment
- split applications of N fertilizere3
- Outcome
- grain yield, protein, and N use efficiencye3
- Direction
- more efficiente3
- Comparator
- applying all N pre-plante3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“grain yield, protein and N uptake of winter wheat”
e3“For grain yield, protein, and N use efficiency, split applications of N fertilizer were much more efficient than applying all N pre-plant”
Claim · model-written summary
Grain yields at the same N rate differed among years by more than 5.0 Mg/ha.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- grain yieldse4
- Value
- 5.0 Mg ha−1e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“grain yield, protein and N uptake of winter wheat”
e4“Large differences in grain yields were noted for different years at the same N rate (range exceeded 5.0 Mg ha−1)”
Claim · model-written summary
The authors recommend within-year-specific N rate recommendations for winter wheat.
- Taxon
- winter wheatTriticum aestivume1
- Outcome
- within-year-specific N rate recommendationse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“grain yield, protein and N uptake of winter wheat”
e5“the need for making within-year-specific N rate recommendations”
The same questions in other papers
fertilization · quality: protein · Triticum aestivum (wheat)Positive and negative results
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- no effect
- positive
- positive
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See all 566 papers →fertilization · yield · Triticum aestivum (wheat)Positive and negative results
3,114 papers in the same direction as this paper · 284 in the opposite direction · 39 reporting no difference from an alternative
- negative
- positive
- positive
3,434 papers more in this group
See all 3,438 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.