Abstract
The presence of weeds at the beginning of cultivation can negatively affect cassava productivity because of the slow initial development of the crop. To minimize weed interference, pre-emergence herbicides can be used, provided they are selective to crops. In this study, we evaluated the selectivity and efficacy of herbicides applied in pre-emergence of cassava crop in weed control. Two experiments were conducted in the field during the years 2017, 2018 and 2019. Each year, ten different herbicides were evaluated, along and untreated controls. In the 2017 efficacy experiment, the mixture of atrazine + s-metolachlor provided the highest rate of weed control at 42 days after application (DAA) (76%). The herbicides sulfentrazone, flumioxazin, clomazone, s-metolachlor and metribuzin caused the lowest poisonings in 2017, with rates below 20% in all evaluation periods. Diuron and metribuzin reduced cassava yield. In the second experiment, only the combinations of ametryn + clomazone and ametryn + flumioxazin maintained control levels greater than 85% in all evaluations. Cassava plants experienced less than 25% poisoning for all herbicides tested. However, the use of linuron and the application of paraquat alone did not result in yield reductions. Regarding the relative productivity of the roots, in 2017, only ametryn + clomazone did not result in reductions, while in 2018, the combination s-metolachlor + clomazone was the only one that did not reduce productivity. The results indicate selective and effective herbicides can help reduce production costs and increase yield in cassava crops.
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Claims 10
Claim · model-written summary
Atrazine plus s-metolachlor gave 76% weed control at 42 days in 2017.
- Taxon
- Cassava Crop
Manihot esculentat0 - Treatment
- atrazine + s-metolachlore0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Direction
- higheste0
- Value
- 76%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the mixture of atrazine + s-metolachlor provided the highest rate of weed control at 42 days after application (DAA) (76%)”
t0“Cassava Crop”
Claim · model-written summary
Sulfentrazone, flumioxazin, clomazone, s-metolachlor and metribuzin each caused below 20% cassava poisoning in 2017.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- sulfentrazone, flumioxazin, clomazone, s-metolachlor and metribuzine0
- Outcome
- poisoningse0
- Direction
- loweste0
- Value
- below 20%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The herbicides sulfentrazone, flumioxazin, clomazone, s-metolachlor and metribuzin caused the lowest poisonings in 2017, with rates below 20% in all evaluation periods”
t0“Cassava Crop”
Claim · model-written summary
Diuron and metribuzin reduced cassava yield.
- Taxon
- cassavaManihot esculentae0
- Treatment
- Diuron and metribuzine0
- Outcome
- cassava yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diuron and metribuzin reduced cassava yield”
Claim · model-written summary
Ametryn plus clomazone maintained weed control above 85% in all second-experiment evaluations.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- ametryn + clomazonee0
- Interactor
- weede1weed
- Outcome
- control levelse0
- Direction
- greater thane0
- Value
- 85%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the combinations of ametryn + clomazone and ametryn + flumioxazin maintained control levels greater than 85% in all evaluations”
t0“Cassava Crop”
e1“the mixture of atrazine + s-metolachlor provided the highest rate of weed control at 42 days after application (DAA) (76%)”
Claim · model-written summary
Ametryn plus flumioxazin maintained weed control above 85% in all second-experiment evaluations.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- ametryn + flumioxazine0
- Outcome
- control levelse0
- Direction
- greater thane0
- Value
- 85%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“only the combinations of ametryn + clomazone and ametryn + flumioxazin maintained control levels greater than 85% in all evaluations”
t0“Cassava Crop”
Claim · model-written summary
All herbicides tested caused less than 25% cassava poisoning in the second experiment.
- Taxon
- CassavaManihot esculentae0
- Treatment
- all herbicides testede0
- Outcome
- poisoninge0
- Direction
- less thane0
- Value
- 25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava plants experienced less than 25% poisoning for all herbicides tested”
Claim · model-written summary
Linuron did not reduce yield.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- linurone0
- Outcome
- yielde0
- Direction
- did not result in yield reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of linuron and the application of paraquat alone did not result in yield reductions”
t0“Cassava Crop”
Claim · model-written summary
Paraquat alone did not reduce yield.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- paraquat alonee0
- Outcome
- yielde0
- Direction
- did not result in yield reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of linuron and the application of paraquat alone did not result in yield reductions”
t0“Cassava Crop”
Claim · model-written summary
Ametryn plus clomazone alone did not reduce relative root productivity in 2017.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- ametryn + clomazonee0
- Outcome
- reductionse0
- Direction
- did not result in reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 2017, only ametryn + clomazone did not result in reductions”
t0“Cassava Crop”
Claim · model-written summary
S-metolachlor plus clomazone alone did not reduce root productivity in 2018.
- Taxon
- Cassava CropManihot esculentat0
- Treatment
- s-metolachlor + clomazonee0
- Outcome
- productivitye0
- Direction
- did not reducee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 2018, the combination s-metolachlor + clomazone was the only one that did not reduce productivity”
t0“Cassava Crop”
The same questions in other papers
atrazine · weed · Manihot esculenta (cassava)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
paraquat · yield · Manihot esculenta (cassava)Positive and negative results
3 in the opposite direction
- positive
- positive
- 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.