Abstract
Studies to determine the suitability of paraquat (1,1′dimethyl‐4,4′‐bipyridinium ion) as a preharvest desiccant were conducted on rice ( Oryza sativa L.) cultivars ‘Brazos’ and ‘Labelle’. Under hot, clear weather conditions, paraquat rates of 0.14 kg/ha or above desiccated the leaves within 1 day. Under cool, cloudy conditions 2 to 3 days were required for desiccation. Paraquat applied to rice after the grains were fully developed at rates up to 0.56 kg/ha up to 10 days before harvest (DBH) did not reduce grain yields. Grain moisture, however, was reduced when a minimum of 0.14 kg/ha paraquat was applied at least 4 DBH. Percent whole kernels after milling was not lowered, or lowered only slightly, by application of up to 0.56 kg/ha paraquat up to 10 DBH. These results suggest that paraquat could be a valuable preharvest desiccant for rice if toxic residues are not found in the grain.
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Claims 6
Claim · model-written summary
Paraquat at 0.14 kg/ha or above dried rice leaves within one day under hot, clear weather.
- Taxon
- rice
Oryza sativat0 - Treatment
- paraquat rates of 0.14 kg/ha or abovee0
- Outcome
- desiccated the leavese0
- Direction
- desiccatede0
- Value
- within 1 daye0
- Setting
- hot, clear weather conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under hot, clear weather conditions, paraquat rates of 0.14 kg/ha or above desiccated the leaves within 1 day.”
t0“Rice”
Claim · model-written summary
Rice leaves required two to three days for desiccation under cool, cloudy conditions.
- Taxon
- riceOryza sativat0
- Outcome
- desiccatione0
- Value
- 2 to 3 dayse0
- Setting
- cool, cloudy conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under cool, cloudy conditions 2 to 3 days were required for desiccation.”
t0“Rice”
Claim · model-written summary
Paraquat up to 0.56 kg/ha applied up to ten days before harvest after full grain development did not reduce rice grain yield.
- Taxon
- riceOryza sativae0
- Treatment
- Paraquat applied to rice after the grains were fully developed at rates up to 0.56 kg/ha up to 10 days before harvest (DBH)e0
- Outcome
- grain yieldse0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Paraquat applied to rice after the grains were fully developed at rates up to 0.56 kg/ha up to 10 days before harvest (DBH) did not reduce grain yields.”
Claim · model-written summary
Paraquat at at least 0.14 kg/ha applied at least four days before harvest reduced rice grain moisture.
- Taxon
- riceOryza sativat0
- Treatment
- a minimum of 0.14 kg/ha paraquat was applied at least 4 DBHe0
- Outcome
- Grain moisturee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain moisture, however, was reduced when a minimum of 0.14 kg/ha paraquat was applied at least 4 DBH.”
t0“Rice”
Claim · model-written summary
Paraquat up to 0.56 kg/ha applied up to ten days before harvest did not lower, or only slightly lowered, whole kernel percentage after milling.
- Taxon
- riceOryza sativat0
- Treatment
- application of up to 0.56 kg/ha paraquat up to 10 DBHe0
- Outcome
- Percent whole kernels after millinge0
- Direction
- not lowered, or lowered only slightlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percent whole kernels after milling was not lowered, or lowered only slightly, by application of up to 0.56 kg/ha paraquat up to 10 DBH.”
t0“Rice”
Claim · model-written summary
The authors suggest paraquat could be a valuable preharvest rice desiccant if grain lacks toxic residues.
- Taxon
- riceOryza sativae0
- Outcome
- valuable preharvest desiccante0
- Qualifier
- if toxic residues are not found in the graine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These results suggest that paraquat could be a valuable preharvest desiccant for rice if toxic residues are not found in the grain.”
The same questions in other papers
paraquat · yield · Oryza sativa (rice)Results differ
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- positive
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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.