Abstract
Abstract Field studies were conducted on organic soils in Belle Glade, FL, in 2016 to 2017 to evaluate sugarcane tolerance and fall panicum control with topramezone applied alone or in combination with triazine herbicides (atrazine, metribuzin, ametryn). Treatments included topramezone (25 and 50 g ai ha −1 ) applied alone or in combination with atrazine (2,240 g ai ha −1 ), metribuzin (2,240 g ai ha −1 ), and ametryn (440 g ha −1 ) on four plant cane varieties to evaluate tolerance, and on second ratoon fields to determine efficacy on fall panicum control. Topramezone applied alone had no effect on sugarcane chlorophyll fluorescence (i.e., the ratio of variable fluorescence to maximum fluorescence), total chlorophyll, and carotenoid 7 to 28 d after treatment (DAT), suggesting sugarcane tolerance. Significant reduction of these parameters occured 7 to 14 DAT when topramezone (50 g ai ha −1 ) was applied with ametryn or metribuzin; however, reductions were not detected thereafter, indicating recovery. Sugarcane yield was not affected by topramezone applied alone or in combination with the triazine herbicides. Topramezone (50 g ai ha −1 ) plus metribuzin resulted in acceptable control of fall panicum (84%) with limited to no regrowth of meristematic tissue at sugarcane canopy closure, equivalent to 56 to 70 DAT. These results indicate that when sequential applications of topramezone, applied alone or in combination with these triazine herbicides, are required for efficacious weed control, topramezone applications alone can be made after 7 d, whereas the combinations can be made after 14 or 21 d, depending on sugarcane sensitivity.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Topramezone applied alone had no effect on sugarcane chlorophyll fluorescence, total chlorophyll or carotenoid 7 to 28 days after treatment, suggesting tolerance.
- Taxon
- sugarcanee0
- Treatment
- Topramezone applied alonee0
- Outcome
- sugarcane chlorophyll fluorescence (i.e., the ratio of variable fluorescence to maximum fluorescence), total chlorophyll, and carotenoide0
- Direction
- no effecte0
- Qualifier
- 7 to 28 d after treatmente0
Not reportedComparator
Verbatim
e0“Topramezone applied alone had no effect on sugarcane chlorophyll fluorescence (i.e., the ratio of variable fluorescence to maximum fluorescence), total chlorophyll, and carotenoid 7 to 28 d after treatment (DAT)”
Claim · model-written summary
Topramezone at 50 g ai ha-1 applied with ametryn or metribuzin significantly reduced the chlorophyll fluorescence, total chlorophyll and carotenoid parameters 7 to 14 days after treatment.
- Taxon
- Sugarcanet0
- Treatment
- topramezone (50 g ai ha −1 ) was applied with ametryn or metribuzine0
- Outcome
- these parameterse0
- Direction
- reductione0
- Qualifier
- 7 to 14 DATe0
Not reportedComparator
Verbatim
t0“Sugarcane”
e0“Significant reduction of these parameters occured 7 to 14 DAT when topramezone (50 g ai ha −1 ) was applied with ametryn or metribuzin”
Claim · model-written summary
Reductions after topramezone combined with ametryn or metribuzin were not detected later, indicating recovery.
- Taxon
- Sugarcanet0
- Treatment
- topramezone (50 g ai ha −1 ) was applied with ametryn or metribuzine0
- Outcome
- reductions were not detected thereafter, indicating recoverye1
Not reportedComparatorDirection
Verbatim
t0“Sugarcane”
e0“when topramezone (50 g ai ha −1 ) was applied with ametryn or metribuzin”
e1“reductions were not detected thereafter, indicating recovery”
Claim · model-written summary
Sugarcane yield was not affected by topramezone applied alone or combined with triazine herbicides.
- Taxon
- Sugarcanee0
- Treatment
- topramezone applied alone or in combination with the triazine herbicidese0
- Outcome
- Sugarcane yielde0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“Sugarcane yield was not affected by topramezone applied alone or in combination with the triazine herbicides”
Claim · model-written summary
Topramezone at 50 g ai ha-1 plus metribuzin gave acceptable control of fall panicum (84%).
- Taxon
- fall panicum
Panicum dichotomiflorume0 - Treatment
- Topramezone (50 g ai ha −1 ) plus metribuzine0
- Interactor
- fall panicumPanicum dichotomiflorume0weed
- Outcome
- control of fall panicume0
- Direction
- acceptable controle0
- Value
- 84%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Topramezone (50 g ai ha −1 ) plus metribuzin resulted in acceptable control of fall panicum (84%) with limited to no regrowth of meristematic tissue at sugarcane canopy closure, equivalent to 56 to 70 DAT”
Claim · model-written summary
After topramezone (50 g ai ha-1) plus metribuzin, fall panicum showed limited to no regrowth of meristematic tissue at sugarcane canopy closure, 56 to 70 days after treatment.
- Taxon
- fall panicumPanicum dichotomiflorume0
- Treatment
- Topramezone (50 g ai ha −1 ) plus metribuzine0
- Interactor
- fall panicumPanicum dichotomiflorume0weed
- Outcome
- regrowth of meristematic tissuee0
- Direction
- limited to no regrowthe0
- Qualifier
- at sugarcane canopy closure, equivalent to 56 to 70 DATe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Topramezone (50 g ai ha −1 ) plus metribuzin resulted in acceptable control of fall panicum (84%) with limited to no regrowth of meristematic tissue at sugarcane canopy closure, equivalent to 56 to 70 DAT”
Claim · model-written summary
The authors conclude that sequential topramezone applications alone can be made after 7 days.
Verbatim
t0“Sugarcane”
e0“topramezone applications alone can be made after 7 d”
Claim · model-written summary
The authors conclude that sequential applications of topramezone combined with triazine herbicides can be made after 14 or 21 days, depending on sugarcane sensitivity.
Verbatim
t0“Sugarcane”
e0“the combinations can be made after 14 or 21 d, depending on sugarcane sensitivity”
The same questions in other papers
topramezone · yield · Saccharum officinarum (sugarcane)Positive and negative results
1 in the opposite direction
- positive
herbicide · yield · Saccharum officinarum (sugarcane)Results differ
13 papers in the same direction as this paper · 37 in the opposite direction
- positive
- positive
- positive
47 papers more in this group
See all 51 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.