Abstract
Weed control efficacy with contact herbicides can depend on weed height at application. Four field experiments were conducted at sites with multiple weed species at different heights to determine the effect of weed height, glufosinate rate, and the addition of ammonium sulfate (AMS) on annual broadleaf weed control in soybean in southwestern Ontario, Canada, during 2021 and 2022. Glufosinate was applied at 300 or 500 g ai ha-1 without or with 6.50 L ha-1 of AMS to 5, 10, and 15 cm tall common lambsquarters (Chenopodium album L.), common ragweed (Ambrosia artemisiifolia L.), velvetleaf (Abutilon theophrasti Medik.), and redroot pigweed (Amaranthus retroflexus L.). Glufosinate provided excellent common ragweed control (> 98%) at both rates, without and with AMS, and at all three heights 4 weeks application (WAA). In contrast, glufosinate efficacy declined when applied to common lambsquarters, velvetleaf, and redroot pigweed > 5 cm in height. The addition of AMS to glufosinate improved common lambsquarters control. Increasing the rate of glufosinate to 500 g ai ha-1 and the addition of AMS improved control of velvetleaf and redroot pigweed. The results of this study demonstrate that the effect of glufosinate rate, AMS addition, and weed height at application timing is weed species-specific. In general, glufosinate (300 g ai ha-1) controlled common annual broadleaf weeds if weeds were < 5 cm in height; otherwise, glufosinate needed to be applied at 500 g ai ha-1 with AMS for control of annual broadleaf weeds, especially common lambsquarters, velvetleaf and redroot pigweed.
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Claims 9
Claim · model-written summary
Glufosinate controlled common ragweed by more than 98% across rates, AMS conditions and heights.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Glufosinatee0
- Interactor
- common ragweed
Ambrosia artemisiifoliae0weed - Outcome
- common ragweed controle0
- Direction
- excellente0
- Value
- > 98%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glufosinate provided excellent common ragweed control (> 98%) at both rates, without and with AMS, and at all three heights 4 weeks application (WAA)”
t0“soybean in southwestern Ontario”
Claim · model-written summary
Glufosinate efficacy declined against common lambsquarters above 5 cm.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinatee0
- Interactor
- common lambsquarters
Chenopodium albume0weed - Outcome
- common lambsquarterse0
- Direction
- declinede0
- Qualifier
- > 5 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glufosinate efficacy declined when applied to common lambsquarters, velvetleaf, and redroot pigweed > 5 cm in height”
t0“soybean in southwestern Ontario”
Claim · model-written summary
Glufosinate efficacy declined against velvetleaf above 5 cm.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinatee0
- Interactor
- velvetleaf
Abutilon theophrastie0weed - Outcome
- velvetleafe0
- Direction
- declinede0
- Qualifier
- > 5 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glufosinate efficacy declined when applied to common lambsquarters, velvetleaf, and redroot pigweed > 5 cm in height”
t0“soybean in southwestern Ontario”
Claim · model-written summary
Glufosinate efficacy declined against redroot pigweed above 5 cm.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinatee0
- Interactor
- redroot pigweede0weed
- Outcome
- redroot pigweede0
- Direction
- declinede0
- Qualifier
- > 5 cme0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glufosinate efficacy declined when applied to common lambsquarters, velvetleaf, and redroot pigweed > 5 cm in height”
t0“soybean in southwestern Ontario”
Claim · model-written summary
AMS added to glufosinate improved common lambsquarters control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- The addition of AMS to glufosinatee0
- Interactor
- common lambsquartersChenopodium albume0weed
- Outcome
- common lambsquarters controle0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The addition of AMS to glufosinate improved common lambsquarters control”
t0“soybean in southwestern Ontario”
Claim · model-written summary
Higher glufosinate rate and AMS improved velvetleaf control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinate to 500 g ai ha-1 and the addition of AMSe0
- Interactor
- velvetleafAbutilon theophrastie0weed
- Outcome
- velvetleafe0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the rate of glufosinate to 500 g ai ha-1 and the addition of AMS improved control of velvetleaf and redroot pigweed”
t0“soybean in southwestern Ontario”
Claim · model-written summary
Higher glufosinate rate and AMS improved redroot pigweed control.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinate to 500 g ai ha-1 and the addition of AMSe0
- Interactor
- redroot pigweede0weed
- Outcome
- redroot pigweede0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing the rate of glufosinate to 500 g ai ha-1 and the addition of AMS improved control of velvetleaf and redroot pigweed”
t0“soybean in southwestern Ontario”
Claim · model-written summary
The authors conclude 300 g ai ha-1 glufosinate controls annual broadleaf weeds below 5 cm.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinate (300 g ai ha-1)e0
- Interactor
- common annual broadleaf weedse0weed
- Outcome
- controlled common annual broadleaf weedse0
- Qualifier
- < 5 cme0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glufosinate (300 g ai ha-1) controlled common annual broadleaf weeds if weeds were < 5 cm in height”
t0“soybean in southwestern Ontario”
Claim · model-written summary
The authors recommend 500 g ai ha-1 glufosinate with AMS for larger annual broadleaf weeds.
- Taxon
- soybeanGlycine maxt0
- Treatment
- glufosinate needed to be applied at 500 g ai ha-1 with AMSe0
- Interactor
- annual broadleaf weedse0weed
- Outcome
- control of annual broadleaf weedse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“glufosinate needed to be applied at 500 g ai ha-1 with AMS for control of annual broadleaf weeds, especially common lambsquarters, velvetleaf and redroot pigweed”
t0“soybean in southwestern Ontario”
The same questions in other papers
ammonium sulfate · Abutilon theophrasti · Glycine max (soybean)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
1 paper more in this group
See all 5 papers →glufosinate · Abutilon theophrasti · Glycine max (soybean)Results agree
1 paper in the same direction as this paper
- positive
glufosinate · Chenopodium album · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- positive
- positive
glufosinate · Ambrosia artemisiifolia · Glycine max (soybean)Results agree
2 papers in the same direction as this paper
- positive
- positive
ammonium sulfate · Chenopodium album · 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.