Abstract
Cassava is grown on the floodplains of the Solimões river and guarantees food security and income for farmers. However, negative interference of weeds can result in a significant yield loss in the crop. Therefore, the aim of this study was to evaluate the selectivity of herbicides and efficiency of chemical weed control in the cassava ‘Aipim-manteiga’ cultivar, in the floodplain of the Solimões river, in Iranduba, Amazonas. The experimental design was in randomized blocks with four replications. The herbicides evaluated were clomazone (1080 g ha-1), diuron (1750 and 2500 g ha-1) and oxadiazon (400 and 800 g ha-1), applied alone or with hoeing 90 days after planting (DAP). Two control treatments were included: weeding (hoeing) at 30, 60, 90 and 120 DAP and with no weed control. Clomazone caused mild toxicity in the plants, while with diuron and oxadiazon toxicity was moderate; all three were considered safe for the crop. The plant population of the crop was not affected by the herbicides. Clomazone afforded effective weed control up to 45 DAP only, and weeding was necessary at 90 DAP to eliminate negative interference by the weeds on crop yield. Diuron and oxadiazon were effective in controlling weeds throughout the crop cycle of the cassava. Weed interference during the crop life cicle reduced yield by 83.8%.
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Claims 10
Claim · model-written summary
Clomazone caused mild toxicity in cassava.
- Taxon
- cassava
Manihot esculentat0 - Treatment
- Clomazonee0
- Outcome
- toxicitye0
- Qualifier
- mild toxicitye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clomazone caused mild toxicity in the plants”
t0“cassava”
Claim · model-written summary
Diuron caused moderate toxicity in cassava.
- Taxon
- cassavaManihot esculentat0
- Treatment
- diurone0
- Outcome
- toxicitye0
- Qualifier
- moderatee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with diuron and oxadiazon toxicity was moderate”
t0“cassava”
Claim · model-written summary
Oxadiazon caused moderate toxicity in cassava.
- Taxon
- cassavaManihot esculentat0
- Treatment
- oxadiazone0
- Outcome
- toxicitye0
- Qualifier
- moderatee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with diuron and oxadiazon toxicity was moderate”
t0“cassava”
Claim · model-written summary
The three herbicides were considered safe for cassava.
- Taxon
- cassavaManihot esculentat0
- Outcome
- safe for the crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“all three were considered safe for the crop”
t0“cassava”
Claim · model-written summary
Herbicides did not affect cassava plant population.
- Taxon
- cassavaManihot esculentat0
- Treatment
- herbicidese0
- Outcome
- plant populatione0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The plant population of the crop was not affected by the herbicides”
t0“cassava”
Claim · model-written summary
Clomazone controlled weeds effectively only up to 45 days after planting.
- Taxon
- cassavaManihot esculentat0
- Treatment
- Clomazonee0
- Interactor
- weede0weed
- Outcome
- weed controle0
- Qualifier
- up to 45 DAP onlye0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Clomazone afforded effective weed control up to 45 DAP only”
t0“cassava”
Claim · model-written summary
Weeding at 90 days after planting was necessary to eliminate weed interference with yield.
- Taxon
- cassavaManihot esculentat0
- Interactor
- weedse0weed
- Outcome
- weeding was necessary at 90 DAPe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“weeding was necessary at 90 DAP to eliminate negative interference by the weeds on crop yield”
t0“cassava”
Claim · model-written summary
Diuron effectively controlled weeds throughout the cassava cycle.
- Taxon
- cassavaManihot esculentae0
- Treatment
- Diurone0
- Interactor
- weedse0weed
- Outcome
- controlling weedse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diuron and oxadiazon were effective in controlling weeds throughout the crop cycle of the cassava”
Claim · model-written summary
Oxadiazon effectively controlled weeds throughout the cassava cycle.
- Taxon
- cassavaManihot esculentae0
- Treatment
- oxadiazone0
- Interactor
- weedse0weed
- Outcome
- controlling weedse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diuron and oxadiazon were effective in controlling weeds throughout the crop cycle of the cassava”
Claim · model-written summary
Weed interference reduced cassava yield by 83.8%.
- Taxon
- cassavaManihot esculentat0
- Treatment
- Weed interferencee0
- Interactor
- Weede0weed
- Outcome
- yielde0
- Direction
- reducede0
- Value
- 83.8%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Weed interference during the crop life cicle reduced yield by 83.8%”
t0“cassava”
The same questions in other papers
clomazone · 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
diuron · weed · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- positive
herbicide · pest · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- negative
competition · yield · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- negative
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.