Abstract
Effects of repeated late-fall applications of the isopropylamine salt of glyphosate at 1.7 kg ae/ha plus 0.5% (v/v) surfactant on adventitious root buds, thickened propagative roots (> 1.3 mm diam), and shoot density of Canada thistle were studied in continuous hard red spring wheat over a 4-yr period. Glyphosate suppressed Canada thistle shoot density more quickly and to a greater extent than thickened root fresh weight or root bud number. A single fall application of glyphosate drastically decreased Canada thistle shoot density for 1 yr after treatment. However, shoot density was the same as the untreated control by 2 yr after a single fall treatment. Two consecutive late-fall applications of glyphosate in 2 yr decreased Canada thistle shoot density 94% in the fall 1 yr after the last treatment. Glyphosate reduced Canada thistle thickened root fresh weight 70% in the first fall 1 yr after a single fall treatment. However, 2 yr after a single fall application of glyphosate, root fresh weight equalled the controls. Two consecutive fall applications of glyphosate reduced thickened root fresh weight 77% 1 yr after the second treatment.
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Claims 7
Claim · model-written summary
Glyphosate suppressed thistle shoot density faster and more than root weight or root buds.
- Taxon
- spring wheat
Triticum aestivumt0 - Treatment
- Glyphosatee0
- Interactor
- Canada thistle
Cirsium arvensee0weed - Outcome
- Canada thistle shoot densitye0
- Direction
- suppressede0
- Comparator
- thickened root fresh weight or root bud numbere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate suppressed Canada thistle shoot density more quickly and to a greater extent than thickened root fresh weight or root bud number.”
t0“Spring Wheat”
Claim · model-written summary
One fall application sharply decreased thistle shoot density for one year.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- single fall application of glyphosatee0
- Interactor
- Canada thistleCirsium arvensee0weed
- Outcome
- Canada thistle shoot densitye0
- Direction
- drastically decreasede0
- Qualifier
- 1 yr after treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A single fall application of glyphosate drastically decreased Canada thistle shoot density for 1 yr after treatment.”
t0“Spring Wheat”
Claim · model-written summary
Two years after one application thistle shoot density equaled untreated control.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- single fall treatmente0
- Outcome
- shoot densitye0
- Direction
- samee0
- Qualifier
- 2 yre0
- Comparator
- untreated controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“shoot density was the same as the untreated control by 2 yr after a single fall treatment.”
t0“Spring Wheat”
Claim · model-written summary
Two consecutive applications decreased thistle shoot density 94% one year later.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Two consecutive late-fall applications of glyphosate in 2 yre0
- Interactor
- Canada thistleCirsium arvensee0weed
- Outcome
- Canada thistle shoot densitye0
- Direction
- decreasede0
- Value
- 94%e0
- Qualifier
- 1 yr after the last treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two consecutive late-fall applications of glyphosate in 2 yr decreased Canada thistle shoot density 94% in the fall 1 yr after the last treatment.”
t0“Spring Wheat”
Claim · model-written summary
One application reduced thistle root fresh weight 70% one year later.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Glyphosatee0
- Interactor
- Canada thistleCirsium arvensee0weed
- Outcome
- Canada thistle thickened root fresh weighte0
- Direction
- reducede0
- Value
- 70%e0
- Qualifier
- 1 yr after a single fall treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate reduced Canada thistle thickened root fresh weight 70% in the first fall 1 yr after a single fall treatment.”
t0“Spring Wheat”
Claim · model-written summary
Two years after one application root fresh weight equaled controls.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- single fall application of glyphosatee0
- Outcome
- root fresh weighte0
- Direction
- equallede0
- Qualifier
- 2 yre0
- Comparator
- controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“2 yr after a single fall application of glyphosate, root fresh weight equalled the controls.”
t0“Spring Wheat”
Claim · model-written summary
Two applications reduced root fresh weight 77% one year later.
- Taxon
- spring wheatTriticum aestivumt0
- Treatment
- Two consecutive fall applications of glyphosatee0
- Outcome
- thickened root fresh weighte0
- Direction
- reducede0
- Value
- 77%e0
- Qualifier
- 1 yr after the second treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two consecutive fall applications of glyphosate reduced thickened root fresh weight 77% 1 yr after the second treatment.”
t0“Spring Wheat”
The same questions in other papers
glyphosate · growth · Triticum aestivum (wheat)Results differ
6 papers in the same direction as this paper · 19 in the opposite direction
- negative
- negative
- negative
22 papers more in this group
See all 26 papers →glyphosate · Cirsium arvense · Triticum aestivum (wheat)Positive and negative results
1 in the opposite direction
- negative
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.