Abstract
At least two weedings within the first 5 weeks after sowing are necessary to minimize yield reduction caused by weeds in cowpea [ Vigna unguiculata (L.) Walp.]. During a 3-yr study, a preemergence application of metolachlor [2-chloro- N -(2-ethyl-6-methylphenyl)- N -(2-methoxy-1-methylethyl)acetamide] at 2.0 to 3.0 kg/ha, DCPA (dimethyl tetrachloroterephthalate) at 10.0 kg/ha, or pendimethalin [ N -(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] at 2.0 or 2.5 kg/ha controlled most annual grasses effectively. Itchgrass ( Rottboellia exaltata L.) was controlled with pendimethalin at 2.5 kg/ha, but metolachlor had no effect on this weed. These herbicides caused no crop injury and cowpea grain yield was as good as in the handweeded and weed-free plots. Alachlor [2-chloro-2′, 6′-diethyl- N -(methoxymethyl) acetanilide] applied preemergence at 2.0 kg/ha was effective against annual weeds, but was phytotoxic to cowpea.
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Claims 10
Claim · model-written summary
At least two early weedings are needed to minimize weed-related yield loss.
- Taxon
- cowpea
Vigna unguiculatae0 - Interactor
- weedse0weed
- Outcome
- At least two weedings within the first 5 weeks after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At least two weedings within the first 5 weeks after sowing are necessary to minimize yield reduction caused by weeds in cowpea”
Claim · model-written summary
Metolachlor controlled most annual grasses effectively.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- metolachlore0
- Interactor
- annual grassese0weed
- Outcome
- annual grassese0
- Direction
- controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a preemergence application of metolachlor [2-chloro- N -(2-ethyl-6-methylphenyl)- N -(2-methoxy-1-methylethyl)acetamide] at 2.0 to 3.0 kg/ha, DCPA (dimethyl tetrachloroterephthalate) at 10.0 kg/ha, or pendimethalin [ N -(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] at 2.0 or 2.5 kg/ha controlled most annual grasses effectively”
t0“Cowpea”
Claim · model-written summary
DCPA controlled most annual grasses effectively.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- DCPAe0
- Interactor
- annual grassese0weed
- Outcome
- annual grassese0
- Direction
- controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DCPA (dimethyl tetrachloroterephthalate) at 10.0 kg/ha, or pendimethalin [ N -(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] at 2.0 or 2.5 kg/ha controlled most annual grasses effectively”
t0“Cowpea”
Claim · model-written summary
Pendimethalin controlled most annual grasses effectively.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- pendimethaline0
- Interactor
- annual grassese0weed
- Outcome
- annual grassese0
- Direction
- controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pendimethalin [ N -(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine] at 2.0 or 2.5 kg/ha controlled most annual grasses effectively”
t0“Cowpea”
Claim · model-written summary
Pendimethalin controlled itchgrass.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- pendimethalin at 2.5 kg/hae0
- Interactor
- Itchgrasse0weed
- Outcome
- Itchgrasse0
- Direction
- controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Itchgrass ( Rottboellia exaltata L.) was controlled with pendimethalin at 2.5 kg/ha”
t0“Cowpea”
Claim · model-written summary
Metolachlor had no effect on itchgrass.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- metolachlore0
- Outcome
- this weede0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“metolachlor had no effect on this weed”
t0“Cowpea”
Claim · model-written summary
The three herbicides caused no crop injury.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- no crop injurye0
- Direction
- no crop injurye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These herbicides caused no crop injury and cowpea grain yield was as good as in the handweeded and weed-free plots”
Claim · model-written summary
Cowpea grain yield with these herbicides matched handweeded and weed-free plots.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- cowpea grain yielde0
- Direction
- as good ase0
- Comparator
- handweeded and weed-free plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea grain yield was as good as in the handweeded and weed-free plots”
Claim · model-written summary
Alachlor controlled annual weeds.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- Alachlore0
- Interactor
- annual weedse0weed
- Outcome
- annual weedse0
- Direction
- effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alachlor [2-chloro-2′, 6′-diethyl- N -(methoxymethyl) acetanilide] applied preemergence at 2.0 kg/ha was effective against annual weeds”
t0“Cowpea”
Claim · model-written summary
Alachlor was phytotoxic to cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Alachlore1
- Outcome
- phytotoxice0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but was phytotoxic to cowpea”
e1“Alachlor [2-chloro-2′, 6′-diethyl- N -(methoxymethyl) acetanilide] applied preemergence at 2.0 kg/ha”
The same questions in other papers
metolachlor · weed · Vigna unguiculata (cowpea)Positive and negative results
3 in the opposite direction
- positive
- positive
- positive
alachlor · weed · Vigna unguiculata (cowpea)Results agree
1 paper in the same direction as this paper
- 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.