Abstract
A 3-yr field study was conducted from 2005 to 2007 at Stoneville, MS, to determine efficacy of in-crop and autumn-applied glyphosate on purple nutsedge density and yield of no-till glyphosate-resistant (GR) corn and GR soybean. Separate experiments were conducted in GR corn and GR soybean in areas maintained under a no-tillage system after the autumn of 2004. Each experiment was conducted in a split-plot arrangement of treatments in a randomized complete-block design with and without autumn application of glyphosate at 1.68 kg ae/ha as main plots and in-crop herbicide application (glyphosate- and nonglyphosate-based programs) as subplots with three replications. In GR corn, glyphosate applied in the autumn reduced purple nutsedge density by 40 to 67% compared with no glyphosate during 3 yr. In GR corn, glyphosate applied in-crop reduced purple nutsedge shoot density by 48% in 2005, 92% in 2006, and 100% in 2007 compared with no herbicide. However, GR corn yields were unaffected by either in-crop or autumn-applied glyphosate. In GR soybean, glyphosate applied in the autumn reduced purple nutsedge shoot density by 64 to 83% compared with no glyphosate during 3 yr. Glyphosate applied in-crop in GR soybean reduced purple nutsedge density by 81% in 2005 and by 100% in 2006 and 2007 compared with no herbicide. GR soybean yields were similar in 2005, but yields were 34 and 18% higher in 2006 and 2007, respectively, with autumn-applied glyphosate compared with no glyphosate. GR soybean yields were higher with glyphosate applied in-crop compared with no herbicide in 2 of 3 yr. These results indicate that purple nutsedge density could be reduced with glyphosate applied in-crop in no-till GR corn and GR soybean. In addition, autumn-applied glyphosate was effective in reducing purple nutsedge populations following harvest of crops and could be an effective purple nutsedge management strategy regardless of GR trait.
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Claims 9
Claim · model-written summary
In corn, autumn-applied glyphosate reduced purple nutsedge density by 40 to 67% compared with no glyphosate over 3 years.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- glyphosate applied in the autumne1
- Interactor
- purple nutsedgee1weed
- Outcome
- purple nutsedge densitye1
- Direction
- reducede1
- Value
- 40 to 67%e1
- Comparator
- no glyphosatee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In GR corn, glyphosate applied in the autumn reduced purple nutsedge density by 40 to 67% compared with no glyphosate during 3 yr”
Claim · model-written summary
In corn, in-crop glyphosate reduced purple nutsedge shoot density by 48% in 2005, 92% in 2006 and 100% in 2007 compared with no herbicide.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- glyphosate applied in-crope2
- Interactor
- purple nutsedgee2weed
- Outcome
- purple nutsedge shoot densitye2
- Direction
- reducede2
- Value
- 48% in 2005, 92% in 2006, and 100% in 2007e2
- Comparator
- no herbicidee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“In GR corn, glyphosate applied in-crop reduced purple nutsedge shoot density by 48% in 2005, 92% in 2006, and 100% in 2007 compared with no herbicide”
Claim · model-written summary
In corn, in-crop or autumn-applied glyphosate did not affect yield.
- Taxon
- cornZea mays subsp. mayse3
- Treatment
- in-crop or autumn-applied glyphosatee3
- Outcome
- GR corn yieldse3
- Direction
- unaffectede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“However, GR corn yields were unaffected by either in-crop or autumn-applied glyphosate”
Claim · model-written summary
In soybean, autumn-applied glyphosate reduced purple nutsedge shoot density by 64 to 83% compared with no glyphosate over 3 years.
- Taxon
- soybean
Glycine maxe4 - Treatment
- glyphosate applied in the autumne4
- Interactor
- purple nutsedgee4weed
- Outcome
- purple nutsedge shoot densitye4
- Direction
- reducede4
- Value
- 64 to 83%e4
- Comparator
- no glyphosatee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“In GR soybean, glyphosate applied in the autumn reduced purple nutsedge shoot density by 64 to 83% compared with no glyphosate during 3 yr”
Claim · model-written summary
In soybean, in-crop glyphosate reduced purple nutsedge density by 81% in 2005 and by 100% in 2006 and 2007 compared with no herbicide.
- Taxon
- soybeanGlycine maxe5
- Treatment
- Glyphosate applied in-crope5
- Interactor
- purple nutsedgee5weed
- Outcome
- purple nutsedge densitye5
- Direction
- reducede5
- Value
- 81% in 2005 and by 100% in 2006 and 2007e5
- Comparator
- no herbicidee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Glyphosate applied in-crop in GR soybean reduced purple nutsedge density by 81% in 2005 and by 100% in 2006 and 2007 compared with no herbicide”
Claim · model-written summary
In soybean, autumn-applied glyphosate did not change yield in 2005.
- Taxon
- soybeanGlycine maxe6
- Treatment
- autumn-applied glyphosatee6
- Outcome
- GR soybean yieldse6
- Direction
- similare6
- Qualifier
- 2005e6
- Comparator
- no glyphosatee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“GR soybean yields were similar in 2005, but yields were 34 and 18% higher in 2006 and 2007, respectively, with autumn-applied glyphosate compared with no glyphosate”
Claim · model-written summary
In soybean, autumn-applied glyphosate increased yield by 34% in 2006 compared with no glyphosate.
- Taxon
- soybeanGlycine maxe6
- Treatment
- autumn-applied glyphosatee6
- Outcome
- GR soybean yieldse6
- Direction
- highere6
- Value
- 34e6
- Qualifier
- 2006e6
- Comparator
- no glyphosatee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“GR soybean yields were similar in 2005, but yields were 34 and 18% higher in 2006 and 2007, respectively, with autumn-applied glyphosate compared with no glyphosate”
Claim · model-written summary
In soybean, autumn-applied glyphosate increased yield by 18% in 2007 compared with no glyphosate.
- Taxon
- soybeanGlycine maxe6
- Treatment
- autumn-applied glyphosatee6
- Outcome
- GR soybean yieldse6
- Direction
- highere6
- Value
- 18%e6
- Qualifier
- 2007, respectivelye6
- Comparator
- no glyphosatee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“GR soybean yields were similar in 2005, but yields were 34 and 18% higher in 2006 and 2007, respectively, with autumn-applied glyphosate compared with no glyphosate”
Claim · model-written summary
In soybean, in-crop glyphosate increased yield compared with no herbicide in 2 of 3 years.
- Taxon
- soybeanGlycine maxe7
- Treatment
- glyphosate applied in-crope7
- Outcome
- GR soybean yieldse7
- Direction
- highere7
- Qualifier
- in 2 of 3 yre7
- Comparator
- no herbicidee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“GR soybean yields were higher with glyphosate applied in-crop compared with no herbicide in 2 of 3 yr”
The same questions in other papers
glyphosate · yield · Zea mays (maize)Results differ
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54 papers in the same direction as this paper · 57 in the opposite direction · 11 reporting no difference from an alternative
- positive
- no effect
- negative
119 papers more in this group
See all 123 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.