Abstract
Dry-seeded rice (Oryza sativa L.) is an emerging establishment system in irrigated areas in many Asian countries, including Sri Lanka. A field experiment was conducted in the major (Maha) 2011/12 and minor (Yala) 2012 seasons at the research farm of the Rice Research and Development Institute, Sri Lanka, to evaluate the efficacy of several herbicides in an irrigated dry-seeded rice system. Herbicide treatments included propanil, followed by MCPA (2-methyl-4-chlorophenoxyacetic acid), pendimethalin, oxadiazon plus propanil, oxyfluorfen, and pendimethalin, followed by fenoxaprop plus ethoxysulfuron, oxadiazon plus propanil, followed by fenoxaprop plus ethoxysulfuron, and oxyfluorfen followed by fenoxaprop plus ethoxysulfuron. The efficacy of herbicides varied across years. All herbicide-treated plots had lower weed density and weed biomass than the untreated plots. The results suggested that oxyfluorfen applied alone provided the poorest weed control. Generally, there was no effect of the additional spray of fenoxaprop plus ethoxysulfuron on weed biomass at 42 days after planting. However, grain yield was higher in the plots sprayed with the pre-emergence, followed by post-emergence herbicides, compared with the plots sprayed with only pre-emergence herbicide(s). The results suggest that different herbicide options are available in Sri Lanka to effectively control weeds in dry-seeded rice systems.
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Claims 6
Claim · model-written summary
All herbicide-treated plots had lower weed density and weed biomass than untreated plots in dry-seeded rice.
- Taxon
- Oryza sativa
Oryza sativae0 - Treatment
- herbicide-treated plotse1
- Interactor
- weede1weed
- Outcome
- weed density and weed biomasse1
- Direction
- lowere1
- Comparator
- untreated plotse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry-seeded rice (Oryza sativa L.) is an emerging establishment system in irrigated areas in many Asian countries, including Sri Lanka”
e1“All herbicide-treated plots had lower weed density and weed biomass than the untreated plots”
Claim · model-written summary
Oxyfluorfen applied alone gave the poorest weed control in dry-seeded rice.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- oxyfluorfen applied alonee2
- Outcome
- weed controle2
- Direction
- pooreste2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry-seeded rice (Oryza sativa L.) is an emerging establishment system in irrigated areas in many Asian countries, including Sri Lanka”
e2“The results suggested that oxyfluorfen applied alone provided the poorest weed control”
Claim · model-written summary
The additional spray of fenoxaprop plus ethoxysulfuron had no effect on weed biomass at 42 days after planting.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- additional spray of fenoxaprop plus ethoxysulfurone3
- Outcome
- weed biomasse3
- Direction
- no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry-seeded rice (Oryza sativa L.) is an emerging establishment system in irrigated areas in many Asian countries, including Sri Lanka”
e3“Generally, there was no effect of the additional spray of fenoxaprop plus ethoxysulfuron on weed biomass at 42 days after planting”
Claim · model-written summary
Grain yield was higher where pre-emergence herbicide was followed by post-emergence herbicide than with pre-emergence herbicide alone.
- Taxon
- Oryza sativaOryza sativae0
- Treatment
- pre-emergence, followed by post-emergence herbicidese4
- Outcome
- grain yielde4
- Direction
- highere4
- Comparator
- only pre-emergence herbicide(s)e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry-seeded rice (Oryza sativa L.) is an emerging establishment system in irrigated areas in many Asian countries, including Sri Lanka”
e4“grain yield was higher in the plots sprayed with the pre-emergence, followed by post-emergence herbicides, compared with the plots sprayed with only pre-emergence herbicide(s)”
Claim · model-written summary
The efficacy of herbicides in dry-seeded rice varied across years.
- Taxon
- Oryza sativaOryza sativae0
- Outcome
- efficacy of herbicidese5
- Qualifier
- varied across yearse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry-seeded rice (Oryza sativa L.) is an emerging establishment system in irrigated areas in many Asian countries, including Sri Lanka”
e5“The efficacy of herbicides varied across years”
Claim · model-written summary
Different herbicide options are available in Sri Lanka to effectively control weeds in dry-seeded rice.
Verbatim
e6“different herbicide options are available in Sri Lanka to effectively control weeds in dry-seeded rice systems”
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