Abstract
Abstract Field trials were carried out over a three year period in an alfisol in a subhumid tropical environment to evaluate the effectiveness of hand-weeding frequencies and several herbicides for weed control in cassava (Manihot esculenta Crantz). Uncontrolled weed growth caused 40% reduction in root yield of short, profusely branching cassava cultivar while a 68% reduction in root yield was observed in separate studies involving a tall non-branching cultivar. Two or three properly timed hoe weedings gave crop yields that were as good as keeping the plots weed free throughout the growing season. Although pre-emergence application of fluometuron at 2.0 to 3.0 kg a.i./ha or diuron at 2.0 kg a.i./ha used singly gave good weed control and crop yield, the efficacy of these herbicides was greatly improved by tank mixing each of them with alachlor or metolachlor at 3.0 and 2.0 kg a.i./ha respectively. Excellent crop yield was also observed where atrazine and metolachlor was applied pre-emergence at 2.5 kg a.i....
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Claims 7
Claim · model-written summary
Uncontrolled weeds reduced root yield of a short branching cassava cultivar by 40%.
- Taxon
- cassava
Manihot esculentat0 - Material
- short, profusely branching cassava cultivare0
- Interactor
- weede0weed
- Outcome
- root yielde0
- Direction
- reductione0
- Value
- 40%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uncontrolled weed growth caused 40% reduction in root yield of short, profusely branching cassava cultivar”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Uncontrolled weeds reduced root yield of a tall nonbranching cultivar by 68%.
- Taxon
- cassavaManihot esculentat0
- Material
- tall non-branching cultivare0
- Outcome
- root yielde0
- Direction
- reductione0
- Value
- 68%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a 68% reduction in root yield was observed in separate studies involving a tall non-branching cultivar.”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Two or three timed hoe weedings produced yields comparable with weed-free plots.
- Taxon
- cassavaManihot esculentat0
- Treatment
- Two or three properly timed hoe weedingse0
- Outcome
- crop yieldse0
- Direction
- as good ase0
- Comparator
- keeping the plots weed free throughout the growing seasone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two or three properly timed hoe weedings gave crop yields that were as good as keeping the plots weed free throughout the growing season.”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Fluometuron alone gave good weed control and yield.
- Taxon
- cassavaManihot esculentat0
- Treatment
- fluometuron at 2.0 to 3.0 kg a.i./hae0
- Interactor
- weede0weed
- Outcome
- good weed control and crop yielde0
- Direction
- goode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pre-emergence application of fluometuron at 2.0 to 3.0 kg a.i./ha or diuron at 2.0 kg a.i./ha used singly gave good weed control and crop yield”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Diuron alone gave good weed control and yield.
- Taxon
- cassavaManihot esculentat0
- Treatment
- diuron at 2.0 kg a.i./hae0
- Interactor
- weede0weed
- Outcome
- good weed control and crop yielde0
- Direction
- goode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pre-emergence application of fluometuron at 2.0 to 3.0 kg a.i./ha or diuron at 2.0 kg a.i./ha used singly gave good weed control and crop yield”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Tank mixing herbicides improved weed control over single use.
- Taxon
- cassavaManihot esculentat0
- Treatment
- tank mixing each of them with alachlor or metolachlor at 3.0 and 2.0 kg a.i./ha respectivelye0
- Outcome
- efficacy of these herbicidese0
- Direction
- greatly improvede0
- Comparator
- these herbicidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the efficacy of these herbicides was greatly improved by tank mixing each of them with alachlor or metolachlor at 3.0 and 2.0 kg a.i./ha respectively.”
t0“cassava (Manihot esculenta Crantz)”
Claim · model-written summary
Pre-emergence atrazine and metolachlor produced excellent crop yield.
- Taxon
- cassavaManihot esculentat0
- Treatment
- atrazine and metolachlor was applied pre-emergence at 2.5 kg a.i.e0
- Outcome
- crop yielde0
- Direction
- Excellente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excellent crop yield was also observed where atrazine and metolachlor was applied pre-emergence at 2.5 kg a.i.”
t0“cassava (Manihot esculenta Crantz)”
The same questions in other papers
atrazine · yield · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- positive
diuron · weed · Manihot esculenta (cassava)Results agree
1 paper in the same direction as this paper
- positive
herbicide · yield · Manihot esculenta (cassava)Positive and negative results
18 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative
- negative
- positive
- positive
21 papers more in this group
See all 25 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.