Abstract
Studies were conducted at three locations in North Carolina in 2004 to evaluate density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield. GR corn was taller than GR cotton as early as 25 d after planting, depending on location. A GR corn density of 5.25 plant/m of crop row reduced late season cotton height by 49, 24, and 28% at Clayton, Lewiston–Woodville, and Rocky Mount, respectively, compared to weed-free cotton height. At Clayton, GR corn dry biomass per m crop row and GR corn seed biomass per m of crop row decreased linearly with increasing corn density. The relationship between GR corn and GR cotton yield loss was described by the rectangular hyperbola model with the asymptote (a) constrained to 100% maximum yield loss. The estimated coefficient i (yield loss per unit density as density approaches zero) was 9, 5, and 5 at Clayton, Lewiston–Woodville, and Rocky Mount, respectively. The examined GR corn densities had a significant effect on cotton yield, but not as significant as many other problematic grass and broadleaf weeds.Nomenclature: Glyphosate; corn, Zea mays L., ZEAMX, ‘DKC 69-71RR’; cotton, Gossypium hirsutum L. ‘FM 989RR’, ‘ST 4892RR’.
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Claims 10
Claim · model-written summary
GR corn was taller than GR cotton as early as 25 days after planting.
Verbatim
e0“GR corn was taller than GR cotton as early as 25 d after planting, depending on location”
Claim · model-written summary
GR corn density of 5.25 plant/m reduced late season cotton height by 49% at Clayton compared with weed-free cotton.
- Taxon
- cotton
Gossypium hirsutume1 - Treatment
- GR corn density of 5.25 plant/m of crop rowe1
- Interactor
- GR corne1weed
- Outcome
- late season cotton heighte1
- Direction
- reducede1
- Value
- 49e1
- Comparator
- weed-free cotton heighte1
- Setting
- Claytone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“A GR corn density of 5.25 plant/m of crop row reduced late season cotton height by 49, 24, and 28% at Clayton, Lewiston–Woodville, and Rocky Mount, respectively, compared to weed-free cotton height”
Claim · model-written summary
GR corn density of 5.25 plant/m reduced late season cotton height by 24% at Lewiston-Woodville compared with weed-free cotton.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- GR corn density of 5.25 plant/m of crop rowe1
- Interactor
- GR corne1weed
- Outcome
- late season cotton heighte1
- Direction
- reducede1
- Value
- 24e1
- Comparator
- weed-free cotton heighte1
- Setting
- Lewiston–Woodvillee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“A GR corn density of 5.25 plant/m of crop row reduced late season cotton height by 49, 24, and 28% at Clayton, Lewiston–Woodville, and Rocky Mount, respectively, compared to weed-free cotton height”
Claim · model-written summary
GR corn density of 5.25 plant/m reduced late season cotton height by 28% at Rocky Mount compared with weed-free cotton.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- GR corn density of 5.25 plant/m of crop rowe1
- Interactor
- GR corne1weed
- Outcome
- late season cotton heighte1
- Direction
- reducede1
- Value
- 28e1
- Comparator
- weed-free cotton heighte1
- Setting
- Rocky Mounte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“A GR corn density of 5.25 plant/m of crop row reduced late season cotton height by 49, 24, and 28% at Clayton, Lewiston–Woodville, and Rocky Mount, respectively, compared to weed-free cotton height”
Claim · model-written summary
GR corn dry biomass and seed biomass per metre of row decreased linearly with increasing corn density at Clayton.
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“At Clayton, GR corn dry biomass per m crop row and GR corn seed biomass per m of crop row decreased linearly with increasing corn density”
Claim · model-written summary
The yield-loss coefficient i for GR corn on GR cotton is 9 at Clayton.
- Taxon
- GR cottone0
- Outcome
- estimated coefficient i (yield loss per unit density as density approaches zero)e1
- Value
- 9e1
- Setting
- Claytone1
Not reportedDirection
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“The estimated coefficient i (yield loss per unit density as density approaches zero) was 9, 5, and 5 at Clayton, Lewiston–Woodville, and Rocky Mount, respectively”
Claim · model-written summary
The yield-loss coefficient i for GR corn on GR cotton is 5 at Lewiston-Woodville.
- Taxon
- GR cottone0
- Outcome
- estimated coefficient i (yield loss per unit density as density approaches zero)e1
- Value
- 5e1
- Setting
- Lewiston–Woodvillee1
Not reportedDirection
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“The estimated coefficient i (yield loss per unit density as density approaches zero) was 9, 5, and 5 at Clayton, Lewiston–Woodville, and Rocky Mount, respectively”
Claim · model-written summary
The yield-loss coefficient i for GR corn on GR cotton is 5 at Rocky Mount.
- Taxon
- GR cottone0
- Outcome
- estimated coefficient i (yield loss per unit density as density approaches zero)e1
- Value
- 5e1
- Setting
- Rocky Mounte1
Not reportedDirection
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“The estimated coefficient i (yield loss per unit density as density approaches zero) was 9, 5, and 5 at Clayton, Lewiston–Woodville, and Rocky Mount, respectively”
Claim · model-written summary
GR corn densities had a significant effect on cotton yield.
Not reportedComparatorDirection
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“The examined GR corn densities had a significant effect on cotton yield, but not as significant as many other problematic grass and broadleaf weeds”
Claim · model-written summary
The effect of GR corn densities on cotton yield is not as significant as that of many other grass and broadleaf weeds.
Verbatim
e0“density-dependent effects of glyphosate-resistant (GR) corn on GR cotton growth and lint yield”
e1“The examined GR corn densities had a significant effect on cotton yield, but not as significant as many other problematic grass and broadleaf weeds”
The same questions in other papers
Zea mays subsp. mays · growth · Gossypium hirsutum (cotton)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.