Abstract
This study has aimed to diagnose and compare the predominant weed species in cowpea crop in the Amazon region and to evaluate the effectiveness of herbicides applied in pre-emergence. The weed sampling was obtained before planting, the cowpea cultivar was BRS Arac, by collecting all the plants present within a 0.25 m hollow frame, randomly thrown 40 times in experimental area to calculate the phytosociological indices. The herbicide efficiency experiment was conducted in a randomized block design with four replications, in time subdivided plot model. Treatments were applied one day after crop planting, their doses (g/ha ai) were: metribuzin (360), sulfentrazone (600), S-metolachlor (1200), pendimethalin (750), oxadiazon (1000), alachlor (2400), metribuzin + pendimethalin (360 + 750), metribuzin + alachlor (360 + 2400), manual weeding and weedy check. The evaluations of weed control were done at 21, 28 and 35 DAP. The most important weed in phytosociology was Tridax procumbens. Cultivation of the crop with weeds caused a reduction of more than 66% in crop productivity. The application of the metribuzin herbicide prevented the emergence of all cowpea seedlings while oxadiazon satisfactorily controlled the weeds without affecting the crop yield.
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Claims 5
Claim · model-written summary
Tridax procumbens was the most important weed in the cowpea survey.
- Taxon
- cowpea
Vigna unguiculatae1 - Interactor
- Tridax procumbens
Tridax procumbense0weed - Outcome
- most important weed in phytosociologye0
- Setting
- Amazon regione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The most important weed in phytosociology was Tridax procumbens”
e1“cowpea crop in the Amazon region”
Claim · model-written summary
Growing cowpea with weeds reduced productivity by over 66%.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- with weedse0
- Interactor
- weedse0weed
- Outcome
- crop productivitye0
- Direction
- reductione0
- Value
- more than 66%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cultivation of the crop with weeds caused a reduction of more than 66% in crop productivity”
e1“cowpea crop in the Amazon region”
Claim · model-written summary
Metribuzin prevented all cowpea seedlings from emerging.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- metribuzin herbicidee0
- Outcome
- emergence of all cowpea seedlingse0
- Direction
- preventede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of the metribuzin herbicide prevented the emergence of all cowpea seedlings”
Claim · model-written summary
Oxadiazon satisfactorily controlled weeds.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- oxadiazone0
- Interactor
- weedse0weed
- Outcome
- the weedse0
- Direction
- controllede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oxadiazon satisfactorily controlled the weeds without affecting the crop yield”
e1“cowpea crop in the Amazon region”
Claim · model-written summary
Oxadiazon did not affect cowpea yield.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- oxadiazone0
- Outcome
- crop yielde0
- Direction
- without affectinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“oxadiazon satisfactorily controlled the weeds without affecting the crop yield”
e1“cowpea crop in the Amazon region”
The same questions in other papers
herbicide · growth · Vigna unguiculata (cowpea)Positive and negative results
4 papers in the same direction as this paper · 8 in the opposite direction
- positive
- positive
- positive
9 papers more in this group
See all 13 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.