Abstract
Abstract Throughout the mid‐southern United States, indeterminate maturity group (MG) IV soybean ( Glycine max L. Merr.) have largely taken the place of determinate MG V and VI soybean in order maximize yield. However, this shift towards earlier maturity groups results in more green plant material at physiological maturity. Consequently, harvest aids are of interest to producers who seek to defoliate and desiccate soybean in a timely and uniform manner. Field experiments were conducted from 2019 to 2020 to evaluate the impact of harvest aid, application volume, and spray droplet volume mean diameter (VMD) on soybean harvest aid efficacy in Mississippi. Applications of paraquat, saflufenacil, and sodium chlorate were made when soybean averaged 65% brown pods, with application volumes of 5 and 20 gal. acre −1 , and VMDs of 200, 500, and 800 µm. Defoliation, desiccation, and green stems were evaluated at 3, 7, 10, and 14 days after treatment (DAT). Soybean grain yield was obtained at harvest and adjusted to 13% moisture. Harvest aid efficacy did not vary due to application volume. Spray droplet spectra with a VMD of 200 µm maximized both defoliation and desiccation efficacy. At 14 DAT, applications of paraquat and sodium chlorate resulted in 95% defoliation but were similar to saflufenacil at 89%. Applications of paraquat resulted in desiccation of 16 more percentage points than saflufenacil, and 8 more percentage points than sodium chlorate. These data indicate soybean harvest aid applications should contain paraquat. Although efficacy was maximized with spray droplet spectra with a VMD of 200 µm, the total variance in efficacy due to VMD of spray droplets was minimal.
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Claims 9
Claim · model-written summary
Harvest aid efficacy did not vary with application volume.
- Taxon
- soybean
Glycine maxt0 - Treatment
- application volumee0
- Outcome
- Harvest aid efficacye0
- Direction
- did not varye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvest aid efficacy did not vary due to application volume”
t0“soybean”
Claim · model-written summary
A 200 µm spray droplet VMD maximized defoliation and desiccation efficacy.
- Taxon
- soybeanGlycine maxt0
- Treatment
- VMD of 200 µme0
- Outcome
- defoliation and desiccation efficacye0
- Direction
- maximizede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Spray droplet spectra with a VMD of 200 µm maximized both defoliation and desiccation efficacy”
t0“soybean”
Claim · model-written summary
Paraquat produced 95% defoliation at 14 DAT.
- Taxon
- soybeanGlycine maxt0
- Treatment
- paraquate0
- Outcome
- defoliatione0
- Value
- 95%e0
- Qualifier
- At 14 DATe0
- Comparator
- saflufenacile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 DAT, applications of paraquat and sodium chlorate resulted in 95% defoliation but were similar to saflufenacil at 89%”
t0“soybean”
Claim · model-written summary
Sodium chlorate produced 95% defoliation at 14 DAT.
- Taxon
- soybeanGlycine maxt0
- Treatment
- sodium chloratee0
- Outcome
- defoliatione0
- Value
- 95%e0
- Qualifier
- At 14 DATe0
- Comparator
- saflufenacile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 DAT, applications of paraquat and sodium chlorate resulted in 95% defoliation but were similar to saflufenacil at 89%”
t0“soybean”
Claim · model-written summary
Saflufenacil produced 89% defoliation at 14 DAT.
- Taxon
- soybeanGlycine maxt0
- Treatment
- saflufenacile0
- Outcome
- defoliatione0
- Value
- 89%e0
- Qualifier
- At 14 DATe0
- Comparator
- paraquate0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 14 DAT, applications of paraquat and sodium chlorate resulted in 95% defoliation but were similar to saflufenacil at 89%”
t0“soybean”
Claim · model-written summary
Paraquat yielded 16 percentage points more desiccation than saflufenacil.
- Taxon
- soybeanGlycine maxt0
- Treatment
- paraquate0
- Outcome
- desiccatione0
- Direction
- moree0
- Value
- 16 more percentage pointse0
- Comparator
- saflufenacile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of paraquat resulted in desiccation of 16 more percentage points than saflufenacil”
t0“soybean”
Claim · model-written summary
Paraquat yielded 8 percentage points more desiccation than sodium chlorate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- paraquate0
- Outcome
- desiccatione0
- Direction
- moree0
- Value
- 8 more percentage pointse0
- Comparator
- sodium chloratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applications of paraquat resulted in desiccation of 16 more percentage points than saflufenacil, and 8 more percentage points than sodium chlorate”
t0“soybean”
Claim · model-written summary
The authors recommend paraquat in soybean harvest aid applications.
- Taxon
- soybeanGlycine maxe0
- Outcome
- harvest aid applications should contain paraquate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean harvest aid applications should contain paraquat”
Claim · model-written summary
Droplet VMD accounted for minimal variance in harvest aid efficacy.
- Taxon
- soybeanGlycine maxt0
- Treatment
- VMD of spray dropletse0
- Outcome
- total variance in efficacye0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the total variance in efficacy due to VMD of spray droplets was minimal”
t0“soybean”
The same questions in other papers
paraquat · pest · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
saflufenacil · pest · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- positive
- positive
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.