Abstract
Abstract No‐tillage corn ( Zea mays L.) production following winter wheat ( Triticum aestivum L.) is increasing in the central Great Plains. Timely weed control is essential to reduce weed seed production and loss of soil water. This research dealt with the effects of applying herbicides to wheat grown on a fine‐silty, mixed, mesic Typic Argiustolls soil, in North Platte, NE, and herbicide applications 5,20, 35, 50, and 260 days after wheat harvest. Applying metribuzin [4‐amino‐6‐(1,1)‐dimethylethyl)‐3‐(methylthio)‐1,2,4‐triazin‐5(4 H )‐one] to wheat reduced post‐harvest weed biomass 24 to 81%. When herbicide application was delayed until 50 days after wheat harvest, as compared to 5,20, or 35 days, barnyardgrass [ Echinochloa crus‐galli (L.) Beauv.] populations before and after corn planting were the highest. The addition of glyphosate [ N ‐(phosphonomethyl)glycine], paraquat (1,1'‐dimethyl‐4,4'‐bipyridinium ion), or terbutryn [ N ‐(1,ldimethylethyl)‐ N' ‐6‐(methylthio)‐1,3,5‐triazine‐2,4‐diamine] + 2,4‐D [(2,4‐dichlorophenoxy)acetic acid] to atrazine [6‐chloro‐ N' ‐ethyl‐ N' ‐(l‐methylethyl)‐1,3,5‐triazine‐2,4‐diamine] sometimes improved corn yields, when applied after wheat harvest, compared with plots treated with atrazine alone. Optimum corn grain yields were obtained when plots treated with atrazine + paraquat at 5, 20, and 35 days after wheat harvest were sprayed with cyanazine {2‐[[4‐chloro‐6‐ (ethylamino)‐1,3,5‐triazin‐2‐yl]amino]‐2‐methylpropanenitrile} preemergence or handweeded once after the corn was planted. Delaying post‐wheat harvest herbicide application for 260 days reduced corn yields 20%.
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Claims 7
Claim · model-written summary
Applying metribuzin to wheat reduced post-harvest weed biomass by 24 to 81%.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- Applying metribuzine2
- Interactor
- weede1weed
- Outcome
- weed biomasse1
- Direction
- reducede1
- Value
- 24 to 81%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“to wheat reduced post‐harvest weed biomass 24 to 81%”
e2“Applying metribuzin”
Claim · model-written summary
Delaying herbicide application until 50 days after wheat harvest, compared with 5, 20 or 35 days, gave the highest barnyardgrass populations before and after corn planting.
- Taxon
- corn
Zea mays subsp. mayse4 - Treatment
- herbicide application was delayed until 50 days after wheat harveste5
- Interactor
- barnyardgrass
Echinochloa crus-gallie3weed - Outcome
- populations before and after corn plantinge4
- Direction
- higheste4
- Comparator
- 5,20, or 35 dayse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“barnyardgrass”
e4“populations before and after corn planting were the highest”
e5“When herbicide application was delayed until 50 days after wheat harvest, as compared to 5,20, or 35 days”
Claim · model-written summary
Optimum corn grain yields were obtained with atrazine + paraquat applied at 5, 20 and 35 days after wheat harvest, followed by cyanazine or handweeding.
- Taxon
- cornZea mays subsp. mayse6
- Treatment
- atrazine + paraquat at 5, 20, and 35 days after wheat harveste6
- Outcome
- corn grain yieldse6
- Direction
- higherinferrede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Optimum corn grain yields were obtained when plots treated with atrazine + paraquat at 5, 20, and 35 days after wheat harvest”
Claim · model-written summary
Adding glyphosate to atrazine sometimes improved corn yields when applied after wheat harvest, compared with atrazine alone.
- Taxon
- cornZea mays subsp. mayse6
- Treatment
- The addition of glyphosatee7
- Outcome
- corn yieldse6
- Direction
- improvede6
- Qualifier
- sometimese6
- Comparator
- atrazine alonee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“The addition of glyphosate”
e6“sometimes improved corn yields, when applied after wheat harvest, compared with plots treated with atrazine alone”
Claim · model-written summary
Adding paraquat to atrazine sometimes improved corn yields when applied after wheat harvest, compared with atrazine alone.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- paraquate0
- Outcome
- corn yieldse1
- Direction
- improvede1
- Qualifier
- sometimese1
- Comparator
- atrazine alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“paraquat (1,1'”
e1“sometimes improved corn yields, when applied after wheat harvest, compared with plots treated with atrazine alone”
Claim · model-written summary
Adding terbutryn with 2,4-D to atrazine sometimes improved corn yields when applied after wheat harvest, compared with atrazine alone.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- terbutryne0
- Outcome
- corn yieldse1
- Direction
- improvede1
- Qualifier
- sometimese1
- Comparator
- atrazine alonee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“terbutryn”
e1“sometimes improved corn yields, when applied after wheat harvest, compared with plots treated with atrazine alone”
Claim · model-written summary
Delaying post-wheat harvest herbicide application for 260 days reduced corn yields by 20%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- herbicide application for 260 dayse1
- Outcome
- corn yieldse0
- Direction
- reducede0
- Value
- 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced corn yields 20%”
e1“herbicide application for 260 days”
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