Abstract
The competitive ability (defined as root yield in mixture/root yield in monoculture) of Cassava ( Manihot esculenta Crantz) genotypes in monoculture, mixed populations and in multiple cropping systems was studied in the field. Strong competitors produced more roots and stems in genotypic mixtures than in monoculture and did so at the expense of weak competitors. Competitive ability was positively correlated with spacing response and stem and leaf‐weight at harvest, but negatively correlated with harvest index (proportion of root weight to total plant weight) and root yield in monoculture. Because of the negative correlation of competitive ability with root yield in monoculture, improvement in the productivity of cassava cultivars will likely occur through improvements in plant efficiency and at the expense of competitive ability. It is therefore recommended that in selecting high yielding genotypes potentially adapted to productive environments, strong competitors should be eliminated from segregating populations. Modest yield reductions (9 to 13%) occured when cassava was planted in association with beans ( Phaseolus vulgaris L.) or soybeans [ Glycine max (L.) Merrill]. Beans, planted in association with cassava, had non‐significant reductions in yields whereas yields of soybeans were severely reduced. Yields of beans and soybeans were negatively correlated with vegetative vigor of the associated cassava genotype, but were not correlated with yield or intergenotypic competitive ability of the cassava genotype. Cassava can be planted in association with short‐duration crops without sacrificing much in the yields of either crop. High‐yielding cassava genotypes with low vegetative vigor would bring about high combined yields of cassava and the associated crop.
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Claims 12
Claim · model-written summary
Strong cassava competitors produced more roots and stems in genotype mixtures than monoculture, at the expense of weak competitors.
- Taxon
- Cassava
Manihot esculentat0 - Material
- Strong competitorse0
- Outcome
- more roots and stemse0
- Direction
- moree0
- Comparator
- monoculturee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Strong competitors produced more roots and stems in genotypic mixtures than in monoculture and did so at the expense of weak competitors.”
t0“Cassava”
Claim · model-written summary
Competitive ability correlated positively with spacing response and stem and leaf weight at harvest.
- Taxon
- CassavaManihot esculentat0
- Outcome
- Competitive abilitye0
- Direction
- positively correlatede0
- Comparator
- spacing response and stem and leaf‐weight at harveste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Competitive ability was positively correlated with spacing response and stem and leaf‐weight at harvest”
t0“Cassava”
Claim · model-written summary
Competitive ability correlated negatively with harvest index and monoculture root yield.
- Taxon
- CassavaManihot esculentat0
- Outcome
- harvest index (proportion of root weight to total plant weight) and root yield in monoculturee0
- Direction
- negatively correlatede0
- Comparator
- harvest indexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“negatively correlated with harvest index (proportion of root weight to total plant weight) and root yield in monoculture”
t0“Cassava”
Claim · model-written summary
Cassava yield declined modestly by 9 to 13% with bean association.
- Taxon
- CassavaManihot esculentat0
- Treatment
- planted in association with beanse0
- Interactor
- beanse0weed
- Outcome
- yield reductionse0
- Direction
- reductionse0
- Value
- 9 to 13%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Modest yield reductions (9 to 13%) occured when cassava was planted in association with beans ( Phaseolus vulgaris L.)”
t0“Cassava”
Claim · model-written summary
Cassava yield declined modestly by 9 to 13% with soybean association.
- Taxon
- CassavaManihot esculentat0
- Treatment
- soybeanse0
- Interactor
- soybeans
Glycine maxe0weed - Outcome
- yield reductionse0
- Direction
- reductionse0
- Value
- 9 to 13%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Modest yield reductions (9 to 13%) occured when cassava was planted in association with beans ( Phaseolus vulgaris L.) or soybeans [ Glycine max (L.) Merrill]”
t0“Cassava”
Claim · model-written summary
Bean yield reductions with cassava were nonsignificant.
- Taxon
- Beanse0
- Treatment
- planted in association with cassavae0
- Interactor
- cassavaManihot esculentae0weed
- Outcome
- yieldse0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Beans, planted in association with cassava, had non‐significant reductions in yields”
Claim · model-written summary
Soybean yields were severely reduced with cassava.
- Taxon
- soybeansGlycine maxe0
- Treatment
- association with cassavae0
- Interactor
- cassavaManihot esculentae0weed
- Outcome
- yields of soybeanse0
- Direction
- severely reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Beans, planted in association with cassava, had non‐significant reductions in yields whereas yields of soybeans were severely reduced.”
Claim · model-written summary
Bean and soybean yields correlated negatively with vegetative vigor of associated cassava.
- Taxon
- beans and soybeanse0
- Interactor
- cassavaManihot esculentae0weed
- Outcome
- Yields of beans and soybeanse0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields of beans and soybeans were negatively correlated with vegetative vigor of the associated cassava genotype”
Claim · model-written summary
Bean and soybean yields did not correlate with cassava yield or intergenotypic competitive ability.
- Taxon
- beans and soybeanse1
- Interactor
- cassavaManihot esculentae0weed
- Outcome
- Yields of beans and soybeanse1
- Direction
- not correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were not correlated with yield or intergenotypic competitive ability of the cassava genotype”
e1“Yields of beans and soybeans were negatively correlated with vegetative vigor of the associated cassava genotype”
Claim · model-written summary
Authors recommend eliminating strong competitors when selecting high yielding genotypes.
- Taxon
- CassavaManihot esculentat0
- Outcome
- strong competitors should be eliminated from segregating populationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in selecting high yielding genotypes potentially adapted to productive environments, strong competitors should be eliminated from segregating populations”
t0“Cassava”
Claim · model-written summary
Authors conclude cassava can be associated with short duration crops with little yield sacrifice.
- Taxon
- CassavaManihot esculentae0
- Outcome
- planted in association with short‐duration crops without sacrificing much in the yields of either crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cassava can be planted in association with short‐duration crops without sacrificing much in the yields of either crop.”
Claim · model-written summary
High yielding cassava genotypes with low vegetative vigor are proposed to raise combined yields.
- Taxon
- cassavaManihot esculentae0
- Outcome
- high combined yields of cassava and the associated crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High‐yielding cassava genotypes with low vegetative vigor would bring about high combined yields of cassava and the associated crop.”
The same questions in other papers
Manihot esculenta · yield · Phaseolus vulgaris (common bean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
Manihot esculenta · yield · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
Glycine max · yield · Manihot esculenta (cassava)Positive and negative results
4 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
6 papers more in this group
See all 10 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.