Abstract
SUMMARY Data from 94 experiments on sorghum/pigeonpea intercropping were examined for evidence that the stability of yield is greater with intercropping than sole cropping. Stability of the major component (sorghum) was examined by calculating the distribution of yields; stability of the overall intercropping system was examined by calculating coefficients of variation, by computing regressions of yield against an environmental index, and by estimating the probability of monetary returns falling below given ‘disaster’ levels. All these approaches have some merit; taking the last as an example, it was found that for a particular ‘disaster’ level quoted, sole pigeonpea would fail one year in five, sole sorghum one year in eight, but intercropping only one year in thirty-six. Intercropping gave yield advantages under a wide range of environmental conditions and there was no significant evidence that advantages were greater under stress. This is discussed in relation to possible mechanisms contributing to greater yield stability.
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Claims 5
Claim · model-written summary
At one disaster threshold, sole pigeonpea failed one year in five.
- Taxon
- pigeonpea
Cajanus cajane0 - Outcome
- faile0
- Value
- one year in fivee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sole pigeonpea would fail one year in five”
Claim · model-written summary
At the same threshold, sole sorghum failed one year in eight.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sole sorghum one year in eight”
e1“sole pigeonpea would fail one year in five”
Claim · model-written summary
At the same threshold, intercropping failed one year in thirty-six.
- Taxon
- sorghum/pigeonpeaCajanus cajan
Sorghume1 - Treatment
- intercroppinge0
- Outcome
- one year in thirty-sixe0
- Direction
- onlye0
- Value
- one year in thirty-sixe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but intercropping only one year in thirty-six”
e1“sorghum/pigeonpea intercropping”
Claim · model-written summary
Intercropping gave yield advantages across a wide range of environmental conditions.
- Taxon
- sorghum/pigeonpeaCajanus cajanSorghume1
- Treatment
- Intercroppinge0
- Outcome
- yield advantagese0
- Direction
- advantagese0
- Qualifier
- under a wide range of environmental conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercropping gave yield advantages under a wide range of environmental conditions”
e1“sorghum/pigeonpea intercropping”
Claim · model-written summary
The yield advantage of intercropping was not significantly greater under stress.
- Taxon
- sorghum/pigeonpeaCajanus cajanSorghume1
- Outcome
- advantagese0
- Direction
- greatere0
- Setting
- under stresse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no significant evidence that advantages were greater under stress”
e1“sorghum/pigeonpea intercropping”
The same questions in other papers
intercropping · yield · Cajanus cajan (pigeon pea)Results differ
93 papers in the same direction as this paper · 22 in the opposite direction · 1 reporting no difference from an alternative
- negative
- positive
- negative
113 papers more in this group
See all 117 papers →intercropping · yield · SorghumResults differ
117 papers in the same direction as this paper · 42 in the opposite direction · 5 reporting no difference from an alternative
- negative
- negative
- no effect
161 papers more in this group
See all 165 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.