Abstract
Glyphosate-resistant canola was seeded at Vegreville, Alberta, in 1997 and 1999 and barley in rotation with the canola in 1998 at three seeding rates. The effects, at each crop seeding rate, of variable glyphosate (canola) and tralkoxydim plus bromoxynil plus MCPA (barley) rates on crop yield, net economic return and seed production by wild oat, wild mustard, and wild buckwheat, and the amount of weed seed in the soil seed bank was determined. Crop seeding rate influenced the response of canola and barley yield and weed seed production to herbicide rate. At the lowest crop seeding rates, yield responses tended to be parabolic with yields increasing up to one-half and three-quarters of the recommended herbicide rates and trends toward reduced yields at the full rates. This response was not evident at the higher crop seeding rates, where, in most cases the yield reached a maximum between one-half and the full recommended rate. The effects of the herbicides on weed seed production, especially at the lowest rate, were often superior at the higher crop seeding rates. The results indicate that seeding canola and barley at relatively high rates may reduce risk associated with lower crop yields and increased weed seed production at lower than recommended herbicide rates. However, the current cost of herbicide-resistant canola seed may preclude the adoption of this integrated weed management practice by growers.
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Claims 5
Claim · model-written summary
At the lowest crop seeding rates, canola and barley yields increased up to one-half and three-quarters of the recommended herbicide rates.
- Taxon
- canola and barley
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Hordeum vulgare.jpg?width=60)
Brassica napus var. napuse0 - Treatment
- herbicide ratese1
- Outcome
- yieldse1
- Direction
- increasinge1
- Qualifier
- the lowest crop seeding ratese1
- Setting
- Vegreville, Albertae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
.jpg?width=500)
Verbatim
e0“Crop seeding rate influenced the response of canola and barley yield and weed seed production to herbicide rate”
e1“At the lowest crop seeding rates, yield responses tended to be parabolic with yields increasing up to one-half and three-quarters of the recommended herbicide rates and trends toward reduced yields at the full rates”
e2“Glyphosate-resistant canola was seeded at Vegreville, Alberta, in 1997 and 1999”
Claim · model-written summary
At the lowest crop seeding rates, canola and barley yields tended to decrease at the full herbicide rates.
- Taxon
- canola and barleyHordeum vulgareBrassica napus var. napuse0
- Treatment
- full ratese1
- Outcome
- yieldse1
- Direction
- reducede1
- Qualifier
- the lowest crop seeding ratese1
- Setting
- Vegreville, Albertae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop seeding rate influenced the response of canola and barley yield and weed seed production to herbicide rate”
e1“At the lowest crop seeding rates, yield responses tended to be parabolic with yields increasing up to one-half and three-quarters of the recommended herbicide rates and trends toward reduced yields at the full rates”
e2“Glyphosate-resistant canola was seeded at Vegreville, Alberta, in 1997 and 1999”
Claim · model-written summary
At higher crop seeding rates, in most cases yield reached a maximum between one-half and the full recommended herbicide rate.
- Taxon
- canola and barleyHordeum vulgareBrassica napus var. napuse0
- Treatment
- between one-half and the full recommended ratee3
- Outcome
- yielde3
- Direction
- maximume3
- Qualifier
- in most casese3
- Setting
- Vegreville, Albertae2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop seeding rate influenced the response of canola and barley yield and weed seed production to herbicide rate”
e2“Glyphosate-resistant canola was seeded at Vegreville, Alberta, in 1997 and 1999”
e3“This response was not evident at the higher crop seeding rates, where, in most cases the yield reached a maximum between one-half and the full recommended rate”
Claim · model-written summary
Herbicide effects on weed seed production were often superior at the higher crop seeding rates, especially at the lowest herbicide rate.
- Taxon
- canola and barleyHordeum vulgareBrassica napus var. napuse0
- Treatment
- herbicidese4
- Interactor
- wild oate5weed
- Second interactor
- wild mustarde5weed
- Outcome
- weed seed productione4
- Direction
- superiore4
- Qualifier
- especially at the lowest ratee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crop seeding rate influenced the response of canola and barley yield and weed seed production to herbicide rate”
e4“The effects of the herbicides on weed seed production, especially at the lowest rate, were often superior at the higher crop seeding rates”
e5“seed production by wild oat, wild mustard, and wild buckwheat”
Claim · model-written summary
Seeding canola and barley at relatively high rates may reduce the risk of lower crop yields and increased weed seed production at lower than recommended herbicide rates.
- Taxon
- canola and barleyHordeum vulgareBrassica napus var. napuse6
- Outcome
- lower crop yields and increased weed seed productione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The results indicate that seeding canola and barley at relatively high rates may reduce risk associated with lower crop yields and increased weed seed production at lower than recommended herbicide rates”
The same questions in other papers
herbicide · yield · Brassica napus (oilseed rape)Results differ
31 papers in the same direction as this paper · 15 in the opposite direction · 4 reporting no difference from an alternative
- no effect
- negative
- negative
47 papers more in this group
See all 51 papers →herbicide · yield · Hordeum vulgare (barley)Results differ
41 papers in the same direction as this paper · 19 in the opposite direction
- positive
- positive
- no effect
57 papers more in this group
See all 61 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.