Abstract
High protein content in cowpea (Vigna unguiculata (L.) Walp.) is considered as major advantage for its use in nutritional components. In this way, an experiment was conducted to investigate the effect of cropping system, site, and nitrogen fertilization on cowpea crude protein. The study comprised of three cropping systems (Maize-cowpea rotation, monocropping cowpea and intercropped cowpea), three sites (Potchefstroom, Taung, and Rustenburg, South Africa) and two rates of nitrogen fertilizers applied in kg ha-1 at each site (0 and 20 at Potchefstroom, 0 and 17 at Rustenburg, 0 and 23 at Taung). Moreover, a factorial experiment randomized in complete block design with three replications was conducted during 2011/12 and 2012/13 planting seasons. The protein content was determined from green leaves harvested before flowering, immature green pods and seeds during reproductive stage and maturity. Results showed that cropping system had significant effect on cowpea leaf protein content (P < 0.05). Intercropped cowpea significantly gave higher leaf protein (26.7% more) content than rotational cowpea. Cowpea planted at Taung had significantly higher leaf protein (30.1% more) content as compared to cowpea planted at other sites. Application of nitrogen fertilizer contributed to higher protein content of immature pods. Moreover, cowpea protein content differs among the different locations due to different soil types and climatic conditions.
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Claims 5
Claim · model-written summary
Cropping system significantly affected cowpea leaf protein content.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- cropping systeme0
- Outcome
- leaf protein contente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cropping system had significant effect on cowpea leaf protein content (P < 0.05).”
Claim · model-written summary
Intercropped cowpea had 26.7% more leaf protein than rotational cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Intercropped cowpeae0
- Outcome
- leaf proteine0
- Direction
- highere0
- Value
- 26.7% moree0
- Comparator
- rotational cowpeae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Intercropped cowpea significantly gave higher leaf protein (26.7% more) content than rotational cowpea.”
Claim · model-written summary
Cowpea at Taung had 30.1% more leaf protein than at other sites.
- Taxon
- CowpeaVigna unguiculatae0
- Outcome
- leaf proteine0
- Direction
- highere0
- Value
- 30.1% moree0
- Comparator
- other sitese0
- Setting
- Taunge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cowpea planted at Taung had significantly higher leaf protein (30.1% more) content as compared to cowpea planted at other sites.”
Claim · model-written summary
Nitrogen fertilizer application contributed to higher immature pod protein content.
- Taxon
- CowpeaVigna unguiculatat0
- Treatment
- nitrogen fertilizere0
- Outcome
- protein content of immature podse0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of nitrogen fertilizer contributed to higher protein content of immature pods.”
t0“Cowpea”
Claim · model-written summary
Cowpea protein content differed among locations due to soil and climate differences.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- protein contente0
- Qualifier
- different soil types and climatic conditionse0
- Setting
- different locationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cowpea protein content differs among the different locations due to different soil types and climatic conditions.”
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See all 35 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.