Abstract
Field studies in conventional and vertical-tilled soybeans were conducted in 1992/93 and 1993/94 at four locations in Argentina to compare the efficacy of imazethapyr and haloxyfop for johnsongrass control. Control was evaluated by measuring frequency of johnsongrass-infested areas at the beginning of the 1992/93 and 1993/94 growing seasons. Relative johnsongrass leaf area and number of rhizome phytomers within infested areas also was evaluated. Herbicide application reduced frequency of infested areas in the 1992/93 growing season. Frequency of infested areas increased in check plots. No differences were found among herbicide treatments, suggesting that the effect of imazethapyr was as high as that observed for specific graminicides. Reduction in frequency of infested areas caused by herbicide treatments was accompanied to some extent by a decrease in intensity of infestation within infested patches assessed by measuring johnsongrass relative leaf area. Phytomer population levels, on the other hand, were reduced only after two consecutive years of herbicide application. No differences were found among herbicide treatments in terms of impact on both measures of weed abundance. Johnsongrass responded similarly to all treatments regardless of tillage system.
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Claims 7
Claim · model-written summary
Herbicide application reduced the frequency of johnsongrass-infested soybean areas in 1992/93.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Herbicide applicatione0
- Interactor
- johnsongrass
.jpg?width=60)
Sorghum halepensee2weede0 - Outcome
- frequency of infested arease0
- Direction
- reducede0
- Qualifier
- 1992/93 growing seasone0
- Setting
- Argentinae1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Herbicide application reduced frequency of infested areas in the 1992/93 growing season.”
e1“Argentina”
e2“johnsongrass-infested areas”
t0“Soybean (Glycine max)”
Claim · model-written summary
The frequency of johnsongrass-infested areas increased in check plots.
- Taxon
- SoybeanGlycine maxt0
- Interactor
- johnsongrassSorghum halepensee1weed
- Outcome
- Frequency of infested arease0
- Direction
- increasede0
- Comparator
- check plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Frequency of infested areas increased in check plots.”
e1“johnsongrass-infested areas”
t0“Soybean (Glycine max)”
Claim · model-written summary
The herbicide treatments did not differ in control efficacy.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- imazethapyre0
- Interactor
- johnsongrassSorghum halepensee1weed
- Outcome
- johnsongrass controle1
- Direction
- No differencese0
- Comparator
- specific graminicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences were found among herbicide treatments, suggesting that the effect of imazethapyr was as high as that observed for specific graminicides.”
e1“johnsongrass control”
t0“Soybean (Glycine max)”
Claim · model-written summary
Herbicide treatments decreased johnsongrass relative leaf area within infested patches to some extent.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- herbicide treatmentse0
- Interactor
- johnsongrassSorghum halepensee0weed
- Outcome
- johnsongrass relative leaf areae0
- Direction
- decreasee0
- Qualifier
- to some extente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction in frequency of infested areas caused by herbicide treatments was accompanied to some extent by a decrease in intensity of infestation within infested patches assessed by measuring johnsongrass relative leaf area.”
t0“Soybean (Glycine max)”
Claim · model-written summary
Johnsongrass phytomer population levels declined only after two consecutive years of herbicide use.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- two consecutive years of herbicide applicatione0
- Interactor
- johnsongrassSorghum halepensee1weed
- Outcome
- Phytomer population levelse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phytomer population levels, on the other hand, were reduced only after two consecutive years of herbicide application.”
e1“johnsongrass relative leaf area”
t0“Soybean (Glycine max)”
Claim · model-written summary
Herbicide treatments did not differ in their impact on the two measures of weed abundance.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- herbicide treatmentse0
- Interactor
- johnsongrassSorghum halepensee1weed
- Outcome
- both measures of weed abundancee0
- Direction
- No differencese0
- Comparator
- herbicide treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No differences were found among herbicide treatments in terms of impact on both measures of weed abundance.”
e1“johnsongrass relative leaf area”
t0“Soybean (Glycine max)”
Claim · model-written summary
Johnsongrass responded similarly to all treatments regardless of tillage system.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- all treatmentse0
- Interactor
- JohnsongrassSorghum halepensee0weed
- Outcome
- Johnsongrass responded similarlye0
- Direction
- similarlye0
- Comparator
- tillage systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Johnsongrass responded similarly to all treatments regardless of tillage system.”
t0“Soybean (Glycine max)”
The same questions in other papers
Imazethapyr · Sorghum halepense · Glycine max (soybean)Positive and negative results
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →herbicide · Sorghum halepense · Glycine max (soybean)Positive and negative results
8 papers in the same direction as this paper · 3 in the opposite direction
- negative
- positive
- negative
8 papers more in this group
See all 12 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.