Abstract
The development of glyphosate-resistant canola has provided improved weed-management options for growers, but crop tolerance to glyphosate may be inadequate at later growth stages. In this study, glyphosate-resistant canola 45H28 (RR) was used to determine the effects of glyphosate application timing on yield and yield components at several sites in western Canada. Canola received a single glyphosate applications at the two-leaf, six-leaf, bolting, and early bloom stages and sequential applications at the two-leaf + six-leaf, two-leaf + bolting, and two-leaf + early bloom stages. Contrasts were made between early vs. late, single vs. sequential, and on-label (two to six-leaf stage) vs. off-label (above six-leaf stage). In general, differences between application timings were observed for yield and yield components in 3 of 8 site-yr. Off-label applications of glyphosate (later than six-leaf) significantly decreased yield, seeds per pod, and increased thousand-seed weight and aborted pods in canola at the Lethbridge and St. Albert locations. Increased glyphosate translocation because of adequate, but not excessive, moisture to new growth may have suppressed new seed formation and encouraged pod abortion at the time of application in the 2010 and 2011 seasons. Results from this experiment demonstrate the importance of proper application timing of glyphosate on canola and can help better predict the effects of late applications.
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Claims 5
Claim · model-written summary
Application timings differed in yield and components at 3 of 8 site-years.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse0 - Outcome
- yield and yield componentse1
- Value
- 3 of 8 site-yre1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“glyphosate-resistant canola 45H28 (RR)”
e1“differences between application timings were observed for yield and yield components in 3 of 8 site-yr”
Claim · model-written summary
Off-label glyphosate decreased canola yield.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Off-label applications of glyphosate (later than six-leaf)e0
- Outcome
- yielde0
- Direction
- decreasede0
- Setting
- Lethbridge and St. Alberte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Off-label applications of glyphosate (later than six-leaf) significantly decreased yield, seeds per pod, and increased thousand-seed weight and aborted pods in canola at the Lethbridge and St. Albert locations”
Claim · model-written summary
Off-label glyphosate decreased seeds per pod.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Off-label applications of glyphosate (later than six-leaf)e0
- Outcome
- seeds per pode0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Off-label applications of glyphosate (later than six-leaf) significantly decreased yield, seeds per pod, and increased thousand-seed weight and aborted pods in canola at the Lethbridge and St. Albert locations”
Claim · model-written summary
Off-label glyphosate increased thousand-seed weight.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Off-label applications of glyphosate (later than six-leaf)e0
- Outcome
- thousand-seed weighte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Off-label applications of glyphosate (later than six-leaf) significantly decreased yield, seeds per pod, and increased thousand-seed weight and aborted pods in canola at the Lethbridge and St. Albert locations”
Claim · model-written summary
Off-label glyphosate increased aborted pods.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- Off-label applications of glyphosate (later than six-leaf)e0
- Outcome
- aborted podse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Off-label applications of glyphosate (later than six-leaf) significantly decreased yield, seeds per pod, and increased thousand-seed weight and aborted pods in canola at the Lethbridge and St. Albert locations”
The same questions in other papers
glyphosate · yield · Brassica napus (oilseed rape)Results differ
2 papers in the same direction as this paper · 6 in the opposite direction
- positive
- negative
- positive
5 papers more in this group
See all 9 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.