Abstract
The selectivity and efficacy of protoporphyrinogen oxidase (PROTOX) inhibitor herbicides in cassava varieties depend on product formulation, dosage, and soil texture. The aim of this study was to assess the selectivity and efficacy of flumioxazin and sulfentrazone in the cassava variety ‘IPR B36’ and the clone ‘VN 117’. Two experiments were carried out: one in a clayey soil and one in a sandy soil. Both experiments were laid in a split-plot randomized block design with three replicates. The two cassava varieties were used as main plots, with subplots consisting in 10 treatments including, flumioxazin at 50, 75, 100, and 125 g ha-1; sulfentrazone at 250, 500, 750, and 1000 g ha-1; one weed-free control, and one unweeded control. Flumioxazin (≥75 g ha-1) and sulfentrazone (≥250 g ha-1) achieved mean weed control rates > 70 and 90% in both types of soil for up to 90 days after application. Flumioxazin exhibited fewer residual effects on the cassava varieties than sulfentrazone, particularly in clayey soil. Flumioxazin was selective to the different cassava varieties planted in both soil types, whereas sulfentrazone was more selective in clayey soil. PROTOX inhibitors were effective in controlling weed growth in cassava plots, and there were no varietal differences in herbicide selectivity; however, the use of sulfentrazone should be restricted to maximum spray rates of 250 g ha-1 in sandy soils.
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Claims 8
Claim · model-written summary
Flumioxazin achieved mean weed control above 70% for up to 90 days.
- Treatment
- Flumioxazin (≥75 g ha-1)e0
- Interactor
- weede0weed
- Outcome
- weed control ratese0
- Direction
- >e0
- Value
- > 70e0
Not reportedTaxonComparator
Verbatim
e0“Flumioxazin (≥75 g ha-1) and sulfentrazone (≥250 g ha-1) achieved mean weed control rates > 70 and 90% in both types of soil for up to 90 days after application”
t0“cassava varieties”
Claim · model-written summary
Sulfentrazone achieved mean weed control above 90% for up to 90 days.
- Treatment
- sulfentrazone (≥250 g ha-1)e0
- Interactor
- weede0weed
- Outcome
- weed control ratese0
- Direction
- >e0
- Value
- 90%e0
Not reportedTaxonComparator
Verbatim
e0“Flumioxazin (≥75 g ha-1) and sulfentrazone (≥250 g ha-1) achieved mean weed control rates > 70 and 90% in both types of soil for up to 90 days after application”
t0“cassava varieties”
Claim · model-written summary
Flumioxazin had fewer residual effects than sulfentrazone, especially in clayey soil.
- Taxon
- cassava
Manihot esculentae0 - Treatment
- Flumioxazine0
- Outcome
- residual effectse0
- Direction
- fewere0
- Comparator
- sulfentrazonee0
- Setting
- clayey soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flumioxazin exhibited fewer residual effects on the cassava varieties than sulfentrazone, particularly in clayey soil”
Claim · model-written summary
Flumioxazin was selective across varieties in both soils.
- Taxon
- cassavaManihot esculentae0
- Treatment
- Flumioxazine0
- Outcome
- selective to the different cassava varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flumioxazin was selective to the different cassava varieties planted in both soil types”
Claim · model-written summary
Sulfentrazone was more selective in clayey soil.
Not reportedTaxon
Verbatim
e0“sulfentrazone was more selective in clayey soil”
t0“cassava varieties”
Claim · model-written summary
PROTOX inhibitors controlled weed growth in cassava plots.
- Taxon
- cassavaManihot esculentae0
- Treatment
- PROTOX inhibitorse0
- Interactor
- weede0weed
- Outcome
- weed growthe0
- Direction
- controllinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PROTOX inhibitors were effective in controlling weed growth in cassava plots”
Claim · model-written summary
Herbicide selectivity did not differ among cassava varieties.
Not reportedTaxon
Verbatim
e0“there were no varietal differences in herbicide selectivity”
t0“cassava varieties”
Claim · model-written summary
Sulfentrazone should be limited to 250 g ha-1 in sandy soils.
Not reportedTaxon
Verbatim
e0“the use of sulfentrazone should be restricted to maximum spray rates of 250 g ha-1 in sandy soils”
t0“cassava varieties”
The same questions in other papers
sulfentrazone · weed · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- positive
flumioxazin · weed · Manihot esculenta (cassava)Results agree
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.