Abstract
In western Canada, more money is spent on wild oat herbicides than on any other weed species, and wild oat resistance to herbicides is the most widespread resistance issue. A direct-seeded field experiment was conducted from 2010 to 2014 at eight Canadian sites to determine crop life cycle, crop species, crop seeding rate, crop usage, and herbicide rate combination effects on wild oat management and canola yield. Combining 2× seeding rates of early-cut barley silage with 2× seeding rates of winter cereals and excluding wild oat herbicides for 3 of 5 yr (2011 to 2013) often led to similar wild oat density, aboveground wild oat biomass, wild oat seed density in the soil, and canola yield as a repeated canola–wheat rotation under a full wild oat herbicide rate regime. Wild oat was similarly well managed after 3 yr of perennial alfalfa without wild oat herbicides. Forgoing wild oat herbicides in only 2 of 5 yr from exclusively summer annual crop rotations resulted in higher wild oat density, biomass, and seed banks. Management systems that effectively combine diverse and optimal cultural practices against weeds, and limit herbicide use, reduce selection pressure for weed resistance to herbicides and prolong the utility of threatened herbicide tools.
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Claims 5
Claim · model-written summary
Combining doubled seeding rates of early-cut barley silage and winter cereals with omitting wild oat herbicides for 3 of 5 years often gave similar wild oat density, biomass and soil seed density as a repeated canola-wheat rotation with full herbicide rates.
- Taxon
- wild oate0
- Treatment
- Combining 2× seeding rates of early-cut barley silage with 2× seeding rates of winter cereals and excluding wild oat herbicides for 3 of 5 yr (2011 to 2013)e0
- Interactor
- wild oate0weed
- Outcome
- wild oat density, aboveground wild oat biomass, wild oat seed density in the soile0
- Direction
- similare0
- Comparator
- a repeated canola–wheat rotation under a full wild oat herbicide rate regimee0
Verbatim
e0“Combining 2× seeding rates of early-cut barley silage with 2× seeding rates of winter cereals and excluding wild oat herbicides for 3 of 5 yr (2011 to 2013) often led to similar wild oat density, aboveground wild oat biomass, wild oat seed density in the soil, and canola yield as a repeated canola–wheat rotation under a full wild oat herbicide rate regime”
Claim · model-written summary
The same diverse rotation without wild oat herbicides for 3 of 5 years often gave canola yield similar to a repeated canola-wheat rotation with full herbicide rates.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- Combining 2× seeding rates of early-cut barley silage with 2× seeding rates of winter cereals and excluding wild oat herbicides for 3 of 5 yr (2011 to 2013)e0
- Interactor
- wild oate0weed
- Outcome
- canola yielde0
- Direction
- similare0
- Comparator
- a repeated canola–wheat rotation under a full wild oat herbicide rate regimee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Combining 2× seeding rates of early-cut barley silage with 2× seeding rates of winter cereals and excluding wild oat herbicides for 3 of 5 yr (2011 to 2013) often led to similar wild oat density, aboveground wild oat biomass, wild oat seed density in the soil, and canola yield as a repeated canola–wheat rotation under a full wild oat herbicide rate regime”
Claim · model-written summary
Wild oat was similarly well managed after 3 years of perennial alfalfa without wild oat herbicides.
- Taxon
- Wild oate0
- Treatment
- 3 yr of perennial alfalfa without wild oat herbicidese0
- Outcome
- well managede0
- Direction
- similarlye0
Not reportedComparator
Verbatim
e0“Wild oat was similarly well managed after 3 yr of perennial alfalfa without wild oat herbicides”
Claim · model-written summary
Forgoing wild oat herbicides in only 2 of 5 years in exclusively summer annual crop rotations resulted in higher wild oat density, biomass and seed banks.
Verbatim
e0“Forgoing wild oat herbicides in only 2 of 5 yr from exclusively summer annual crop rotations resulted in higher wild oat density, biomass, and seed banks”
Claim · model-written summary
Management systems combining diverse and optimal cultural practices against weeds while limiting herbicide use reduce selection pressure for herbicide resistance.
Verbatim
e0“Management systems that effectively combine diverse and optimal cultural practices against weeds, and limit herbicide use, reduce selection pressure for weed resistance to herbicides”
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