Abstract
Field studies were conducted to determine the sensitivity of conventional ‘Motte’ and ‘Pioneer 9831’ soybean to simulated glyphosate drift rates applied during vegetative and reproductive development and the effect of glyphosate on progeny. Glyphosate at 8, 84, and 420 g ae/ha was applied to soybean at the V3, V6, R2, and R5 growth stages. Glyphosate at 8 and 84 g/ha did not reduce soybean plant population, growth, or yield or cause deleterious effects on progeny, regardless of the growth stage at application. Soybean population, growth, and yield were reduced as much as 99 to 100% after application of 420 g/ha glyphosate at the V3 growth stage. Glyphosate at 420 g/ha applied at V6 was less detrimental to soybean compared with the V3 timing. Delaying the application of 420 g/ha glyphosate until R2 and R5 reduced soybean yields 22 to 49% and 43 to 44%, respectively. Soybean injury from 420 g/ha glyphosate was generally transient or less severe when applied at the V6 growth stage or later. However, 420 g/ha glyphosate at R5 (initial podfill) caused a 390 to 450 kg/ha yield reduction compared with the V6 application, which indicated greater soybean vulnerability to glyphosate drift during podfill than in the late-stage vegetative development. Although glyphosate at 420 g/ha was injurious to soybean, regardless of application timing, progeny was not affected.
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Claims 8
Claim · model-written summary
Glyphosate at 8 and 84 g/ha did not reduce soybean population, growth, yield, or progeny performance at any application stage.
- Taxon
- soybean
Glycine maxe0 - Treatment
- Glyphosate at 8 and 84 g/hae0
- Outcome
- soybean plant population, growth, or yield or cause deleterious effects on progenye0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate at 8 and 84 g/ha did not reduce soybean plant population, growth, or yield or cause deleterious effects on progeny, regardless of the growth stage at application.”
Claim · model-written summary
Glyphosate at 420 g/ha at V3 reduced soybean population, growth, and yield by as much as 99 to 100%.
- Taxon
- SoybeanGlycine maxe0
- Organ / stage
- V3 growth stagee0
- Treatment
- 420 g/ha glyphosatee0
- Outcome
- Soybean population, growth, and yielde0
- Direction
- reducede0
- Value
- 99 to 100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean population, growth, and yield were reduced as much as 99 to 100% after application of 420 g/ha glyphosate at the V3 growth stage.”
Claim · model-written summary
The V6 application of 420 g/ha glyphosate was less detrimental to soybean than V3 application.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Glyphosate at 420 g/ha applied at V6e0
- Outcome
- less detrimentale0
- Direction
- less detrimentale0
- Comparator
- V3 timinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glyphosate at 420 g/ha applied at V6 was less detrimental to soybean compared with the V3 timing.”
Claim · model-written summary
Applying 420 g/ha glyphosate at R2 reduced soybean yield 22 to 49%.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- R2e0
- Treatment
- 420 g/ha glyphosatee0
- Outcome
- soybean yieldse0
- Direction
- reducede0
- Value
- 22 to 49%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying the application of 420 g/ha glyphosate until R2 and R5 reduced soybean yields 22 to 49% and 43 to 44%, respectively.”
t0“Soybean”
Claim · model-written summary
Applying 420 g/ha glyphosate at R5 reduced soybean yield 43 to 44%.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- R5e0
- Treatment
- 420 g/ha glyphosatee0
- Outcome
- soybean yieldse0
- Direction
- reducede0
- Value
- 43 to 44%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Delaying the application of 420 g/ha glyphosate until R2 and R5 reduced soybean yields 22 to 49% and 43 to 44%, respectively.”
Claim · model-written summary
Soybean injury from 420 g/ha glyphosate was transient or less severe when applied at V6 or later.
- Taxon
- SoybeanGlycine maxe0
- Organ / stage
- V6 growth stage or latere0
- Treatment
- 420 g/ha glyphosatee0
- Outcome
- Soybean injurye0
- Direction
- less severee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean injury from 420 g/ha glyphosate was generally transient or less severe when applied at the V6 growth stage or later.”
Claim · model-written summary
At R5, 420 g/ha glyphosate caused a 390 to 450 kg/ha greater yield reduction than at V6.
- Taxon
- SoybeanGlycine maxt0
- Organ / stage
- initial podfille0
- Treatment
- 420 g/ha glyphosate at R5e0
- Outcome
- yield reductione0
- Direction
- reductione0
- Value
- 390 to 450 kg/hae0
- Comparator
- V6 applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“420 g/ha glyphosate at R5 (initial podfill) caused a 390 to 450 kg/ha yield reduction compared with the V6 application”
t0“Soybean”
Claim · model-written summary
Progeny was unaffected by 420 g/ha glyphosate despite soybean injury at all application timings.
- Taxon
- soybeanGlycine maxe0
- Treatment
- glyphosate at 420 g/hae0
- Outcome
- progenye0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Although glyphosate at 420 g/ha was injurious to soybean, regardless of application timing, progeny was not affected.”
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See all 11 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.