Abstract
Experiments were conducted at two locations in Texas during 2000 and 2001 to compare barnyardgrass, broadleaf signalgrass, and red rice control; rice tolerance; and grain yield after single and sequential applications of imazethapyr in imidazolinone-tolerant rice. Red rice and barnyardgrass control on a clay soil at Beaumont was at least 94% with imazethapyr at 70, 90, and 100 g ai/ha applied preplant incorporated (PPI) or preemergence (PRE) followed by (fb) at least 40 g/ha of imazethapyr applied early postemergence (EPOST). Broadleaf signalgrass control on a very fine sandy loam soil at Eagle Lake was at least 86% when imazethapyr was applied PPI or PRE fb EPOST applications of imazethapyr. Sequential postemergence applications at Beaumont resulted in at least 95% red rice and barnyardgrass control when 40 g/ha applied late postemergence followed any EPOST application. Sequential postemergence applications at Eagle Lake controlled broadleaf signalgrass 98% during both years. Imazethapyr applied postemergence injured rice 0 to 34% up to 12 d after treatment. Rice yield reductions were correlated to weed control and most likely were not associated with early-season rice injury.Nomenclature: Imazethapyr; imidazolinone; barnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCG; broadleaf signalgrass, Brachiaria platyphylla (Griseb.) Nash # BRAPP; red rice, Oryza sativa L. # ORYSA; rice, Oryza sativa L. # ORYSA.Additional index words: CLEARFIELD* rice, Newpath.Abbreviations: EPOST, early postemergence; fb, followed by; LPOST, late postemergence; PD, panicle differentiation; PPI, preplant incorporated; PRE, preemergence.
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Claims 9
Claim · model-written summary
PPI or PRE imazethapyr followed by EPOST controlled red rice at least 94% on clay soil.
- Taxon
- rice
Oryza sativat0 - Treatment
- imazethapyr at 70, 90, and 100 g ai/ha applied preplant incorporated (PPI) or preemergence (PRE) followed by (fb) at least 40 g/ha of imazethapyr applied early postemergence (EPOST)e0
- Interactor
- Red ricee0weed
- Outcome
- Red ricee0
- Value
- 94%e0
- Setting
- Beaumonte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red rice and barnyardgrass control on a clay soil at Beaumont was at least 94% with imazethapyr at 70, 90, and 100 g ai/ha applied preplant incorporated (PPI) or preemergence (PRE) followed by (fb) at least 40 g/ha of imazethapyr applied early postemergence (EPOST)”
t0“Rice (Oryza sativa)”
Claim · model-written summary
The same sequence controlled barnyardgrass at least 94% at Beaumont.
- Taxon
- riceOryza sativat0
- Treatment
- imazethapyr at 70, 90, and 100 g ai/ha applied preplant incorporated (PPI) or preemergence (PRE) followed by (fb) at least 40 g/ha of imazethapyr applied early postemergence (EPOST)e0
- Interactor
- barnyardgrass
Echinochloa crus-gallie0weed - Outcome
- barnyardgrass controle0
- Value
- 94%e0
- Setting
- Beaumonte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Red rice and barnyardgrass control on a clay soil at Beaumont was at least 94% with imazethapyr at 70, 90, and 100 g ai/ha applied preplant incorporated (PPI) or preemergence (PRE) followed by (fb) at least 40 g/ha of imazethapyr applied early postemergence (EPOST)”
t0“Rice (Oryza sativa)”
Claim · model-written summary
PPI or PRE followed by EPOST imazethapyr controlled broadleaf signalgrass at least 86% at Eagle Lake.
- Taxon
- riceOryza sativat0
- Treatment
- imazethapyr was applied PPI or PRE fb EPOST applications of imazethapyre0
- Interactor
- Broadleaf signalgrass
Urochloa platyphyllae0weed - Outcome
- Broadleaf signalgrass controle0
- Value
- 86%e0
- Setting
- Eagle Lakee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broadleaf signalgrass control on a very fine sandy loam soil at Eagle Lake was at least 86% when imazethapyr was applied PPI or PRE fb EPOST applications of imazethapyr”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Sequential postemergence imazethapyr controlled red rice at least 95% at Beaumont.
- Taxon
- riceOryza sativat0
- Treatment
- 40 g/ha applied late postemergence followed any EPOST applicatione0
- Interactor
- red ricee0weed
- Outcome
- red ricee0
- Value
- 95%e0
- Setting
- Beaumonte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sequential postemergence applications at Beaumont resulted in at least 95% red rice and barnyardgrass control when 40 g/ha applied late postemergence followed any EPOST application”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Sequential postemergence imazethapyr controlled barnyardgrass at least 95% at Beaumont.
- Taxon
- riceOryza sativat0
- Treatment
- 40 g/ha applied late postemergence followed any EPOST applicatione0
- Interactor
- barnyardgrassEchinochloa crus-gallie0weed
- Outcome
- barnyardgrass controle0
- Value
- 95%e0
- Setting
- Beaumonte0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sequential postemergence applications at Beaumont resulted in at least 95% red rice and barnyardgrass control when 40 g/ha applied late postemergence followed any EPOST application”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Sequential postemergence applications controlled broadleaf signalgrass 98% at Eagle Lake.
- Taxon
- riceOryza sativat0
- Treatment
- Sequential postemergence applicationse0
- Interactor
- broadleaf signalgrassUrochloa platyphyllae0weed
- Outcome
- broadleaf signalgrasse0
- Direction
- controllede0
- Value
- 98%e0
- Setting
- Eagle Lakee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sequential postemergence applications at Eagle Lake controlled broadleaf signalgrass 98% during both years”
t0“Rice (Oryza sativa)”
Claim · model-written summary
Postemergence imazethapyr injured rice by 0 to 34% within 12 days.
- Taxon
- riceOryza sativae0
- Treatment
- Imazethapyr applied postemergencee0
- Outcome
- injured ricee0
- Direction
- injurede0
- Value
- 0 to 34%e0
- Qualifier
- up to 12 d after treatmente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Imazethapyr applied postemergence injured rice 0 to 34% up to 12 d after treatment”
Claim · model-written summary
Rice yield reductions correlated with weed control.
- Taxon
- RiceOryza sativae0
- Interactor
- weede0weed
- Outcome
- Rice yield reductionse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rice yield reductions were correlated to weed control”
Claim · model-written summary
The authors considered early-season injury unlikely to explain rice yield reductions.
- Taxon
- riceOryza sativat0
- Outcome
- rice injurye0
- Qualifier
- most likely were not associated with early-season rice injurye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most likely were not associated with early-season rice injury”
t0“Rice (Oryza sativa)”
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