Abstract
Early canopy closure and manipulation of crop row spacing or density can reduce the amount and frequency of herbicide use in corn. Field studies were conducted at Woodstock, ON from 1996 to 1999 to evaluate the effect of corn row spacing, plant density, and frequency of glufosinate application on weed biomass and corn yield in glufosinate-resistant corn. Treatments included row width, corn density, and herbicide. The effect of row width and corn density on weed biomass was variable among years. In a wet year (1996), narrow (38 cm) rows provided greater weed suppression than wide (76 cm) rows regardless of crop density. In a dry year (1998), narrow-row high-density (100,000 plants/ha) corn had the lowest weed biomass. In other years, either narrow row or high density was equally successful in suppressing weeds. Effectiveness of herbicides in reducing weed biomass was not influenced by row width or corn density. Corn yield was influenced by row width or corn density. Although weed biomass was lowered by two applications of glufosinate in comparison with a single application, corn grain yields were similar between the two treatments. Planting corn at higher densities may help in reducing early-season weed competition, whereas narrow rows may help in controlling later-emerging species.Nomenclature: Glufosinate; glyphosate; metolachlor; dicamba; corn, Zea mays L. Pride X2650LL.Additional index words: Corn row spacing, corn density.Abbreviations: EPOST, early postemergence; IWM, integrated weed management; LPOST, late postemergence; POST, postemergence.
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Claims 10
Claim · model-written summary
Row width and density effects on weed biomass varied across years.
- Taxon
- corn
Zea mays subsp. mayse0 - Interactor
- weede0weed
- Outcome
- weed biomasse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect of row width and corn density on weed biomass was variable among years”
Claim · model-written summary
In wet 1996, narrow rows suppressed weeds more than wide rows across crop densities.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- narrow (38 cm) rowse0
- Interactor
- weede0weed
- Outcome
- weed suppressione0
- Direction
- greatere0
- Qualifier
- In a wet year (1996)e0
- Comparator
- wide (76 cm) rowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a wet year (1996), narrow (38 cm) rows provided greater weed suppression than wide (76 cm) rows regardless of crop density”
t0“Corn”
Claim · model-written summary
In dry 1998, narrow rows at high density had the lowest weed biomass.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- narrow-row high-density (100,000 plants/ha)e0
- Interactor
- weede0weed
- Outcome
- weed biomasse0
- Direction
- loweste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a dry year (1998), narrow-row high-density (100,000 plants/ha) corn had the lowest weed biomass”
Claim · model-written summary
In other years narrow rows or high density each suppressed weeds.
- Taxon
- cornZea mays subsp. mayst0
- Interactor
- weedse0weed
- Outcome
- suppressing weedse0
- Direction
- equally successfule0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In other years, either narrow row or high density was equally successful in suppressing weeds”
t0“Corn”
Claim · model-written summary
Row width and density did not change herbicide effectiveness against weed biomass.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- herbicidese0
- Interactor
- weede0weed
- Outcome
- Effectiveness of herbicides in reducing weed biomasse0
- Direction
- not influencede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Effectiveness of herbicides in reducing weed biomass was not influenced by row width or corn density”
t0“Corn”
Claim · model-written summary
Row width or corn density influenced corn yield.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- row width or corn densitye0
- Outcome
- Corn yielde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yield was influenced by row width or corn density”
Claim · model-written summary
Two glufosinate applications lowered weed biomass compared with one application.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- two applications of glufosinatee0
- Interactor
- weede0weed
- Outcome
- weed biomasse0
- Direction
- lowerede0
- Comparator
- a single applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weed biomass was lowered by two applications of glufosinate in comparison with a single application”
t0“Corn”
Claim · model-written summary
Corn grain yield was similar under two versus one glufosinate application.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- two applications of glufosinatee1
- Outcome
- corn grain yieldse0
- Direction
- similare0
- Comparator
- a single applicatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn grain yields were similar between the two treatments”
e1“two applications of glufosinate in comparison with a single application”
Claim · model-written summary
The authors suggest higher corn density to reduce early weed competition.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Planting corn at higher densitiese0
- Interactor
- weede0weed
- Outcome
- reducing early-season weed competitione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Planting corn at higher densities may help in reducing early-season weed competition”
Claim · model-written summary
The authors suggest narrow rows to control later emerging weeds.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- narrow rowse0
- Interactor
- weedse1weed
- Outcome
- controlling later-emerging speciese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“narrow rows may help in controlling later-emerging species”
e1“suppressing weeds”
t0“Corn”
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3 papers in the same direction as this paper · 1 in the opposite direction
- positive
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See all 5 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.