Abstract
The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined. Seed yield, averaged over all cultivars in the early wet season planting, was 47% less than the 1962 kg ha-1 in the late wet season planting. In the latter experiment, where 18 cultivars were evaluated, the cultivar x density interaction was highly significant (P < 0.01) and eight cultivars had an apparently linear seed yield response to density between 40 000 and 250 000 plants ha-1. Four cultivars showed no significant response to density; the others had maximum seed yield at a planting density of 160 000 plants ha-1. Cultivar differences in seed size and earliness to maturity were noted and the significance of these traits in relation to acceptability and late wet/dry season cowpea production in Trinidad is discussed.
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Claims 6
Claim · model-written summary
Seed yield averaged over all cultivars was 47% lower in the early wet season planting than the 1962 kg ha-1 of the late wet season planting, in Trinidad in 1982.
- Taxon
- cowpea
Vigna unguiculatae2 - Treatment
- early wet season plantinge1
- Outcome
- Seed yielde1
- Direction
- lesse1
- Value
- 47%e1
- Qualifier
- 1962 kg ha-1e1
- Comparator
- late wet season plantinge1
- Setting
- Trinidade2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Seed yield, averaged over all cultivars in the early wet season planting, was 47% less than the 1962 kg ha-1 in the late wet season planting”
e2“The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined”
Claim · model-written summary
The cultivar x density interaction for seed yield was highly significant (P < 0.01) among 18 cultivars in the latter experiment.
- Taxon
- cowpeaVigna unguiculatae2
- Material
- 18 cultivarse3
- Outcome
- cultivar x density interactione3
- Value
- P < 0.01e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined”
e3“In the latter experiment, where 18 cultivars were evaluated, the cultivar x density interaction was highly significant (P < 0.01)”
Claim · model-written summary
Eight cultivars had an apparently linear seed yield response to planting density between 40 000 and 250 000 plants per ha.
- Taxon
- cowpeaVigna unguiculatae2
- Material
- eight cultivarse4
- Treatment
- density between 40 000 and 250 000 plants ha-1e4
- Outcome
- seed yield response to densitye4
- Qualifier
- apparently lineare4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined”
e4“eight cultivars had an apparently linear seed yield response to density between 40 000 and 250 000 plants ha-1”
Claim · model-written summary
Four cultivars showed no significant response of seed yield to planting density.
- Taxon
- cowpeaVigna unguiculatae2
- Material
- Four cultivarse5
- Outcome
- response to densitye5
- Direction
- no significant responsee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined”
e5“Four cultivars showed no significant response to density”
Claim · model-written summary
The other cultivars had maximum seed yield at a planting density of 160 000 plants per ha.
- Taxon
- cowpeaVigna unguiculatae2
- Treatment
- planting density of 160 000 plants ha-1e6
- Outcome
- seed yielde6
- Direction
- maximume6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined”
e6“the others had maximum seed yield at a planting density of 160 000 plants ha-1”
Claim · model-written summary
Cultivars differed in seed size and earliness to maturity.
- Taxon
- cowpeaVigna unguiculatae2
- Outcome
- seed size and earliness to maturitye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The effect of planting density on the seed yield of a number of cowpea cultivars planted in the early and late wet season of 1982 in Trinidad was examined”
e7“Cultivar differences in seed size and earliness to maturity were noted”
The same questions in other papers
climate site · yield · Vigna unguiculata (cowpea)Positive and negative results
3 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
7 papers more in this group
See all 11 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.