Abstract
There is limited information on the effect of weed size at the time of application on glyphosate efficacy in Ontario. Eleven field trials were conducted over a 3 yr period (2010–2012) in Ontario to determine the biologically effective dose of glyphosate applied postemergence (POST) in corn at doses of 112.5–1350 g acid equivalent (a.e.) ha −1 for the control of various grass and broadleaved weed species when the weeds were 10, 20 or 30 cm in height. The GR90 for redroot pigweed, common ragweed, common lamb’s-quarters, barnyardgrass, and green foxtail were 353, 630, 621, 763, and <112.5 g a.e. ha −1 when applied at 10 cm weed height, 235, 201, 906, 868, and 296 g a.e. ha −1 when applied at 20 cm weed height, and 792, >1350, >1350, 912, and 675 g a.e. ha −1 when applied at 30 cm weed height, respectively. Corn yields were maximized when glyphosate was applied to weeds that were up to 10 cm in height, but was reduced with later glyphosate application timings. The results of this study reinforce the importance of early POST weed control in corn.
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Claims 4
Claim · model-written summary
Glyphosate doses for 90% weed control varied with weed height and species.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- 10 cm weed heighte0
- Outcome
- GR90e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“weed size in corn”
e0“The GR90 for redroot pigweed, common ragweed, common lamb’s-quarters, barnyardgrass, and green foxtail were 353, 630, 621, 763, and <112.5 g a.e. ha −1 when applied at 10 cm weed height, 235, 201, 906, 868, and 296 g a.e. ha −1 when applied at 20 cm weed height, and 792, >1350, >1350, 912, and 675 g a.e. ha −1 when applied at 30 cm weed height, respectively.”
Claim · model-written summary
Corn yield was greatest with glyphosate applied when weeds were at most 10 cm.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- glyphosatee0
- Outcome
- Corn yieldse0
- Direction
- maximizede0
- Qualifier
- up to 10 cm in heighte0
- Comparator
- later glyphosate application timingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“weed size in corn”
e0“Corn yields were maximized when glyphosate was applied to weeds that were up to 10 cm in height, but was reduced with later glyphosate application timings.”
Claim · model-written summary
Later glyphosate applications reduced corn yield.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- later glyphosate application timingse0
- Outcome
- Corn yieldse0
- Direction
- reducede0
- Comparator
- up to 10 cm in heighte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“weed size in corn”
e0“Corn yields were maximized when glyphosate was applied to weeds that were up to 10 cm in height, but was reduced with later glyphosate application timings.”
Claim · model-written summary
Authors recommend early postemergence weed control in corn.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- early POST weed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results of this study reinforce the importance of early POST weed control in corn.”
The same questions in other papers
glyphosate · yield · Zea mays (maize)Results differ
41 papers in the same direction as this paper · 29 in the opposite direction · 6 reporting no difference from an alternative
- positive
- negative
- negative
73 papers more in this group
See all 77 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.