Abstract
Experiments were conducted to determine the influence of nitrogen (N) fertility and winter wheat cultivars on weed infestations in a winter wheat-ecofallow sorghum-fallow rotation near North Platte, NE. Centurk 78 and Lancota winter wheat suppressed density and growth of barnyardgrass and green foxtail significantly more than Eagle winter wheat before and after wheat harvest. Increasing N rates applied to winter wheat decreased annual grass weed population and weed yields. However, 67 and 101 kg N ha −1 reduced winter wheat grain yields compared to 34 kg N ha −1 . Plots treated at 2.8 plus 0.3 kg ai ha −1 of atrazine plus paraquat 31 d after wheat harvest had more barnyardgrass before grain sorghum planting in 1983 than plots treated 17 d after wheat harvest but the reverse was true for green foxtail after grain sorghum emergence in 1984. Increasing N rates from 34 kg ha −1 to 67 and 101 kg ha −1 in the previous wheat crop decreased weed density before and after grain sorghum planting. There was no advantage in weed control in the grain sorghum from applying N to winter wheat in the fall vs. spring.
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Claims 12
Claim · model-written summary
Centurk 78 suppressed barnyardgrass density and growth more than Eagle wheat.
- Taxon
- winter wheat
Triticum aestivume0 - Material
- Centurk 78e0
- Treatment
- Centurk 78e0
- Interactor
- barnyardgrass
Echinochloa crus-gallie0weed - Outcome
- density and growth of barnyardgrasse0
- Direction
- moree0
- Comparator
- Eagle winter wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Centurk 78 and Lancota winter wheat suppressed density and growth of barnyardgrass and green foxtail significantly more than Eagle winter wheat before and after wheat harvest”
Claim · model-written summary
Centurk 78 suppressed green foxtail density and growth more than Eagle wheat.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Centurk 78e0
- Treatment
- Centurk 78e0
- Interactor
- green foxtaile0weed
- Outcome
- growth of barnyardgrass and green foxtaile0
- Direction
- moree0
- Comparator
- Eagle winter wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Centurk 78 and Lancota winter wheat suppressed density and growth of barnyardgrass and green foxtail significantly more than Eagle winter wheat before and after wheat harvest”
Claim · model-written summary
Lancota suppressed barnyardgrass density and growth more than Eagle wheat.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Lancotae0
- Treatment
- Lancotae0
- Interactor
- barnyardgrassEchinochloa crus-gallie0weed
- Outcome
- density and growth of barnyardgrasse0
- Direction
- moree0
- Comparator
- Eagle winter wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Centurk 78 and Lancota winter wheat suppressed density and growth of barnyardgrass and green foxtail significantly more than Eagle winter wheat before and after wheat harvest”
Claim · model-written summary
Lancota suppressed green foxtail density and growth more than Eagle wheat.
- Taxon
- winter wheatTriticum aestivume0
- Material
- Lancotae0
- Treatment
- Lancotae0
- Interactor
- green foxtaile0weed
- Outcome
- growth of barnyardgrass and green foxtaile0
- Direction
- moree0
- Comparator
- Eagle winter wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Centurk 78 and Lancota winter wheat suppressed density and growth of barnyardgrass and green foxtail significantly more than Eagle winter wheat before and after wheat harvest”
Claim · model-written summary
Higher nitrogen rates decreased annual grass weed populations.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- Increasing N ratese0
- Interactor
- annual grass weede0weed
- Outcome
- annual grass weed populatione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rates applied to winter wheat decreased annual grass weed population and weed yields”
Claim · model-written summary
Higher nitrogen rates decreased weed yields.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- Increasing N ratese0
- Interactor
- weede0weed
- Outcome
- weed yieldse0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rates applied to winter wheat decreased annual grass weed population and weed yields”
Claim · model-written summary
67 kg N ha −1 reduced wheat grain yield versus 34 kg N ha −1.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- 67e0
- Outcome
- winter wheat grain yieldse0
- Direction
- reducede0
- Comparator
- 34 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“67 and 101 kg N ha −1 reduced winter wheat grain yields compared to 34 kg N ha −1”
Claim · model-written summary
101 kg N ha −1 reduced wheat grain yield versus 34 kg N ha −1.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- 101 kg N ha −1e0
- Outcome
- winter wheat grain yieldse0
- Direction
- reducede0
- Comparator
- 34 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“67 and 101 kg N ha −1 reduced winter wheat grain yields compared to 34 kg N ha −1”
Claim · model-written summary
Later atrazine plus paraquat treatment increased barnyardgrass before sorghum planting in 1983.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 2.8 plus 0.3 kg ai ha −1 of atrazine plus paraquat 31 d after wheat harveste0
- Interactor
- barnyardgrassEchinochloa crus-gallie0weed
- Outcome
- barnyardgrasse0
- Direction
- moree0
- Comparator
- 17 d after wheat harveste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plots treated at 2.8 plus 0.3 kg ai ha −1 of atrazine plus paraquat 31 d after wheat harvest had more barnyardgrass before grain sorghum planting in 1983 than plots treated 17 d after wheat harvest”
Claim · model-written summary
The timing comparison reversed for green foxtail after sorghum emergence in 1984.
- Taxon
- grain sorghum
Sorghum bicolore0 - Treatment
- 31 d after wheat harveste1
- Interactor
- green foxtaile0weed
- Outcome
- green foxtaile0
- Comparator
- 17 d after wheat harveste1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the reverse was true for green foxtail after grain sorghum emergence in 1984”
e1“Plots treated at 2.8 plus 0.3 kg ai ha −1 of atrazine plus paraquat 31 d after wheat harvest had more barnyardgrass before grain sorghum planting in 1983 than plots treated 17 d after wheat harvest”
Claim · model-written summary
Increasing prior-wheat nitrogen from 34 to 67 and 101 kg ha −1 reduced weed density near sorghum planting.
- Taxon
- wheatTriticum aestivume0
- Treatment
- 67 and 101 kg ha −1e0
- Interactor
- weede0weed
- Outcome
- weed densitye0
- Direction
- decreasede0
- Comparator
- 34 kg ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rates from 34 kg ha −1 to 67 and 101 kg ha −1 in the previous wheat crop decreased weed density before and after grain sorghum planting”
Claim · model-written summary
Fall rather than spring nitrogen application to wheat had no weed-control advantage in sorghum.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- applying N to winter wheat in the falle0
- Interactor
- weede0weed
- Outcome
- weed control in the grain sorghume0
- Direction
- no advantagee0
- Comparator
- springe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no advantage in weed control in the grain sorghum from applying N to winter wheat in the fall vs. spring”
The same questions in other papers
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nitrogen · weed · Triticum aestivum (wheat)Positive and negative results
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323 papers in the same direction as this paper · 1,737 in the opposite direction
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See all 2,061 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.