Abstract
Abstract Field experiments were conducted for 2 yr (2014 and 2015) in Fashola, southwestern Nigeria, a low‐phosphorus (P) environment (approx. 1 mg kg − 1 ), to determine the effect of P application on nutrient uptake, growth parameters, and yield in four cowpea [ Vigna unguiculata (L.) Walp.] genotypes (two low‐P tolerant and two low‐P sensitive). Applications were 0 and 30 kg P ha −1 using single super phosphate broadcast on the soil surface just before planting. Phosphorus is very important for leaf and stem development in cowpea at the vegetative stage (i.e., 5 or 6 wk after seeding). This effect appeared more strongly on the genotype with a high amount of biomass (‘Iron bean’) than on genotypes with low biomass (‘IT97K‐499‐38’, ‘Sanzi’, and ‘TVu 7778’). However, in all tested genotypes, P application resulted in taller plants, more leaf area, and heavier shoot dry weight. Uptake of P was increased at flowering stage and at the beginning of pod formation, suggesting that P is necessary for pod formation. As proof, the seed weight per pod in both years (with the exception of ‘Iron bean’ in 2015) was significantly higher under P application. An adequate amount of P uptake can lead to high‐quality seeds.
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Claims 4
Claim · model-written summary
Phosphorus promoted leaf and stem development, most strongly in Iron bean.
- Taxon
- cowpea
Vigna unguiculatae0 - Material
- ‘Iron bean’e0
- Treatment
- Phosphoruse0
- Outcome
- leaf and stem developmente0
- Direction
- more stronglye0
- Comparator
- genotypes with low biomasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus is very important for leaf and stem development in cowpea at the vegetative stage (i.e., 5 or 6 wk after seeding). This effect appeared more strongly on the genotype with a high amount of biomass (‘Iron bean’) than on genotypes with low biomass (‘IT97K‐499‐38’, ‘Sanzi’, and ‘TVu 7778’).”
Claim · model-written summary
Phosphorus application increased plant height, leaf area and shoot dry weight in all genotypes.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- P applicatione0
- Outcome
- taller plants, more leaf area, and heavier shoot dry weighte0
- Direction
- tallere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in all tested genotypes, P application resulted in taller plants, more leaf area, and heavier shoot dry weight”
t0“cowpea”
Claim · model-written summary
Phosphorus uptake increased at flowering and early pod formation.
- Taxon
- cowpeaVigna unguiculatat0
- Organ / stage
- flowering stage and at the beginning of pod formatione0
- Treatment
- Pe0
- Outcome
- Uptake of Pe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Uptake of P was increased at flowering stage and at the beginning of pod formation”
t0“cowpea”
Claim · model-written summary
Phosphorus application significantly increased seed weight per pod in both years except Iron bean in 2015.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- P applicatione0
- Outcome
- seed weight per pode0
- Direction
- highere0
- Qualifier
- with the exception of ‘Iron bean’ in 2015e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the seed weight per pod in both years (with the exception of ‘Iron bean’ in 2015) was significantly higher under P application”
t0“cowpea”
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