Abstract
The increased productivity or yield advantage provided by intercropping is attributed to a better use of resources by crops grown in mixtures, as compared to the same species grown in sole stands. In an intercropping system with upland rice and cowpea, the intra and inter-competition was quantified, as affected by plant population density and rate of nitrogen. Reductions in number of panicles per rice plant and number of grains per panicle were obtained with high density in both sole and mixture rice populations. Increasing nitrogen rate did not affect yield and yield components in both populations, but number and weight of pods per plant of cowpea in sole stands increased. Land equivalent ratios exceeding unity were obtained, indicating an improved resource use by the crop mixture. Relative crowding coefficient and aggressivity indices showed cowpea to be the dominant crop, with rice being dominated. Nitrogen utilization efficiency was high with intercrops, but was generally poor in stands of high population density.
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Claims 7
Claim · model-written summary
High plant density reduced the number of panicles per rice plant and the number of grains per panicle in both sole and mixed rice populations.
- Taxon
- rice
Oryza sativae0 - Treatment
- high densitye0
- Outcome
- number of panicles per rice plant and number of grains per paniclee0
- Direction
- Reductionse0
- Setting
- sole and mixture rice populationse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reductions in number of panicles per rice plant and number of grains per panicle were obtained with high density in both sole and mixture rice populations”
Claim · model-written summary
Increasing the nitrogen rate did not affect yield and yield components of rice and cowpea in either population.
- Taxon
- rice - cowpeat0
- Treatment
- Increasing nitrogen ratee0
- Outcome
- yield and yield componentse0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
t0“rice - cowpea intercrop”
e0“Increasing nitrogen rate did not affect yield and yield components in both populations”
Claim · model-written summary
Increasing the nitrogen rate increased the number and weight of pods per plant of cowpea in sole stands.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- Increasing nitrogen ratee0
- Outcome
- number and weight of pods per plante0
- Direction
- increasede0
- Setting
- sole standse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing nitrogen rate did not affect yield and yield components in both populations, but number and weight of pods per plant of cowpea in sole stands increased”
Claim · model-written summary
Land equivalent ratios above unity were obtained, indicating improved resource use by the rice-cowpea mixture.
Verbatim
t0“rice - cowpea intercrop”
e0“Land equivalent ratios exceeding unity were obtained, indicating an improved resource use by the crop mixture”
Claim · model-written summary
Relative crowding coefficient and aggressivity indices showed cowpea to be the dominant crop and rice to be dominated.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- Relative crowding coefficient and aggressivity indicese0
- Qualifier
- rice being dominatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“rice - cowpea intercrop”
e0“Relative crowding coefficient and aggressivity indices showed cowpea to be the dominant crop, with rice being dominated”
Claim · model-written summary
Nitrogen utilization efficiency was high in the intercrops.
Verbatim
t0“rice - cowpea intercrop”
e0“Nitrogen utilization efficiency was high with intercrops”
Claim · model-written summary
Nitrogen utilization efficiency was generally poor in stands of high population density.
Verbatim
t0“rice - cowpea intercrop”
e0“Nitrogen utilization efficiency was high with intercrops, but was generally poor in stands of high population density”
The same questions in other papers
nitrogen · yield · Vigna unguiculata (cowpea)Results differ
61 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- negative
- no effect
64 papers more in this group
See all 68 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.