Abstract
Field studies were conducted to examine both density and duration of glyphosate-resistant (GR) horseweed interference in cotton. Two studies, one examining the effect of horseweed density and a second the duration of horseweed interference, were conducted on a site with a natural population of horseweed that were treated with glyphosate at 0.84 kg ae ha −1 prior to planting and at the 2nd and 4th cotton node growth stages. GR horseweed density effect on cotton height, maturity, and lint yield was determined at horseweed densities of 0, 5, 10, 15, 20, and 25 plants m −2 . Duration of horseweed interference was evaluated when 20 horseweed m −2 were allowed to interfere with cotton from emergence to 2nd node, 6th node, 10th node, 12th node, and 1st bloom stage of cotton. The maximum cotton lint yield loss (46%) occurred when horseweed was allowed to compete with cotton from emergence to maturity at the two highest densities (20 and 25 horseweed m −2 ). When the data were fit to the Cousens model the estimated a (maximum yield loss) and i (yield loss per unit density as density approaches zero) were 53 ± 7.3 and 2.8 ± 0.6 SE, respectively. In both years of the study, horseweed interference from emergence to the 2nd cotton node did not reduce cotton lint yields. In 2006, cotton lint yield loss was 28% compared to 39% in 2005 when horseweed interfered with cotton from emergence until the 6th cotton node. Cotton lint yield loss was 37 and 44% when horseweed competed to the 8th cotton node in 2005 and 2006, respectively. Maximum horseweed seed production was 134,000 to 148,000 seeds m −2 .
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Claims 9
Claim · model-written summary
Horseweed interference through maturity at the two highest densities caused a maximum 46% cotton lint yield loss.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- horseweed was allowed to compete with cotton from emergence to maturitye0
- Interactor
- horseweed
Erigeron canadensise0weed - Outcome
- cotton lint yield losse0
- Direction
- losse0
- Value
- 46%e0
- Qualifier
- 20 and 25 horseweed m −2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum cotton lint yield loss (46%) occurred when horseweed was allowed to compete with cotton from emergence to maturity at the two highest densities (20 and 25 horseweed m −2 ).”
Claim · model-written summary
The Cousens model estimated maximum cotton yield loss at 53 ± 7.3 SE.
- Taxon
- CottonGossypium hirsutumt0
- Interactor
- HorseweedErigeron canadensist0weed
- Outcome
- maximum yield losse0
- Value
- 53 ± 7.3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the data were fit to the Cousens model the estimated a (maximum yield loss) and i (yield loss per unit density as density approaches zero) were 53 ± 7.3 and 2.8 ± 0.6 SE, respectively.”
t0“Horseweed (Conyza canadensis) Growth, Seed Production, and Interference in Cotton”
Claim · model-written summary
The Cousens model estimated cotton yield loss per unit horseweed density near zero density at 2.8 ± 0.6 SE.
- Taxon
- CottonGossypium hirsutumt0
- Interactor
- HorseweedErigeron canadensist0weed
- Outcome
- yield loss per unit density as density approaches zeroe0
- Value
- 2.8 ± 0.6 SEe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When the data were fit to the Cousens model the estimated a (maximum yield loss) and i (yield loss per unit density as density approaches zero) were 53 ± 7.3 and 2.8 ± 0.6 SE, respectively.”
t0“Horseweed (Conyza canadensis) Growth, Seed Production, and Interference in Cotton”
Claim · model-written summary
Horseweed interference from emergence to the second cotton node did not reduce cotton lint yield in either year.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- horseweed interference from emergence to the 2nd cotton nodee0
- Interactor
- horseweedErigeron canadensise0weed
- Outcome
- cotton lint yieldse0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both years of the study, horseweed interference from emergence to the 2nd cotton node did not reduce cotton lint yields.”
Claim · model-written summary
Cotton lint yield loss from horseweed interference to the sixth cotton node was 28% in 2006.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- horseweed interfered with cotton from emergence until the 6th cotton nodee0
- Interactor
- horseweedErigeron canadensise0weed
- Outcome
- cotton lint yield losse0
- Direction
- losse0
- Value
- 28%e0
- Setting
- 2006e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2006, cotton lint yield loss was 28% compared to 39% in 2005 when horseweed interfered with cotton from emergence until the 6th cotton node.”
Claim · model-written summary
Cotton lint yield loss from horseweed interference to the sixth cotton node was 39% in 2005.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- horseweed interfered with cotton from emergence until the 6th cotton nodee0
- Interactor
- horseweedErigeron canadensise0weed
- Outcome
- cotton lint yield losse0
- Direction
- losse0
- Value
- 39%e0
- Setting
- 2005e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2006, cotton lint yield loss was 28% compared to 39% in 2005 when horseweed interfered with cotton from emergence until the 6th cotton node.”
Claim · model-written summary
Cotton lint yield loss with horseweed competition to the eighth node was 37% in 2005.
- Taxon
- CottonGossypium hirsutume0
- Treatment
- horseweed competed to the 8th cotton nodee0
- Interactor
- horseweedErigeron canadensise0weed
- Outcome
- Cotton lint yield losse0
- Direction
- losse0
- Value
- 37e0
- Setting
- 2005e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton lint yield loss was 37 and 44% when horseweed competed to the 8th cotton node in 2005 and 2006, respectively.”
Claim · model-written summary
Cotton lint yield loss with horseweed competition to the eighth node was 44% in 2006.
- Taxon
- CottonGossypium hirsutume0
- Treatment
- horseweed competed to the 8th cotton nodee0
- Interactor
- horseweedErigeron canadensise0weed
- Outcome
- Cotton lint yield losse0
- Direction
- losse0
- Value
- 44%e0
- Setting
- 2006e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cotton lint yield loss was 37 and 44% when horseweed competed to the 8th cotton node in 2005 and 2006, respectively.”
Claim · model-written summary
Maximum horseweed seed production reached 134,000 to 148,000 seeds per square meter in the cotton study.
- Taxon
- CottonGossypium hirsutumt0
- Interactor
- horseweedErigeron canadensise0weed
- Outcome
- horseweed seed productione0
- Direction
- Maximume0
- Value
- 134,000 to 148,000 seeds m −2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maximum horseweed seed production was 134,000 to 148,000 seeds m −2 .”
t0“Horseweed (Conyza canadensis) Growth, Seed Production, and Interference in Cotton”
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