Abstract
Phosphorus deficiency remains a key constraint to cowpea productivity in Kenya. Continuous cultivation of smallholder farms confounded with inadequate use of fertilizer and use of poor local cowpea (Vigna unguiculata) seed varieties, has led to decreased cowpea yields in western Kenya. Earlier studies have indicated that application of phosphorus fertilizer at recommended rates as well as growing of improved cowpea varieties may result to increased grain yield. Against this background, improved cowpea varieties were screened under different phosphorus (Triple Super Phosphate) fertilizer rates to investigate their response on grain yield production, at sites of differing soil fertility status (Bonjoge and Koibem) in western Kenya. Field experiments were conducted during the short rain (SR) seasons in 2019. The experiments were factorially arranged and laid out in a RCBD with three replications at both sites. P was applied at three levels of 0, 15, and 30 kg P/ha. Six cowpea varieties; one local check (Khaki) and five improved varieties (ICV1, 1CV12, CB46, IT92K-282-2 and IT83D-442) were tested. Grain yield data collected was subjected to analysis of variance using SAS statistical software, release 8.2. Least Significant Difference test separated means of parameters whenever significant difference was detected at ≥ 95% confidence level. Phosphorus application resulted to insignificant (p<0.05) increase in cowpea grain yield across varieties. Highest and least average yields were from variety CB 46 (325 kg/ha) and variety Khaki (216 kg/ha) and IT 90K-284-2 (216 kg/ha), respectively. At Bonjoge, cowpea grain yields varied from 206 to 434 kg/ha and were significantly (p<0.05) higher than the yields at Koibem which ranged from 127 to 342 kg/ha. The results of this study show that while cowpea productivity is influenced by soil fertility status, application of P was not essential for grain yield production. Interaction of fertilizer and varieties in Bonjoge resulted to a positive grain yield response, hence suitable site for cowpea.
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Claims 7
Claim · model-written summary
Phosphorus application produced an insignificant increase in cowpea grain yield across varieties.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- Phosphorus applicatione0
- Outcome
- cowpea grain yielde0
- Direction
- increasee0
- Qualifier
- across varietiese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Phosphorus application resulted to insignificant (p<0.05) increase in cowpea grain yield across varieties.”
Claim · model-written summary
CB 46 had the highest average grain yield, 325 kg/ha.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- CB 46e0
- Outcome
- Highest and least average yieldse0
- Direction
- Higheste0
- Value
- 325 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest and least average yields were from variety CB 46 (325 kg/ha) and variety Khaki (216 kg/ha) and IT 90K-284-2 (216 kg/ha), respectively.”
t0“Cowpea”
Claim · model-written summary
Khaki had one of the lowest average grain yields, 216 kg/ha.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- Khakie0
- Outcome
- average yieldse0
- Direction
- leaste0
- Value
- 216 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest and least average yields were from variety CB 46 (325 kg/ha) and variety Khaki (216 kg/ha) and IT 90K-284-2 (216 kg/ha), respectively.”
t0“Cowpea”
Claim · model-written summary
IT 90K-284-2 had one of the lowest average grain yields, 216 kg/ha.
- Taxon
- CowpeaVigna unguiculatat0
- Material
- IT 90K-284-2e0
- Outcome
- average yieldse0
- Direction
- leaste0
- Value
- 216 kg/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Highest and least average yields were from variety CB 46 (325 kg/ha) and variety Khaki (216 kg/ha) and IT 90K-284-2 (216 kg/ha), respectively.”
t0“Cowpea”
Claim · model-written summary
Cowpea grain yield at Bonjoge was 206 to 434 kg/ha, significantly higher than at Koibem.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- cowpea grain yieldse0
- Direction
- highere0
- Value
- 206 to 434 kg/hae0
- Qualifier
- 127 to 342 kg/hae0
- Comparator
- Koibeme0
- Setting
- Bonjogee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At Bonjoge, cowpea grain yields varied from 206 to 434 kg/ha and were significantly (p<0.05) higher than the yields at Koibem which ranged from 127 to 342 kg/ha.”
Claim · model-written summary
Fertilizer and variety interacted positively for grain yield at Bonjoge.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- fertilizere0
- Outcome
- grain yield responsee0
- Direction
- positivee0
- Setting
- Bonjogee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interaction of fertilizer and varieties in Bonjoge resulted to a positive grain yield response, hence suitable site for cowpea.”
Claim · model-written summary
The authors concluded P application was not essential for cowpea grain yield production.
- Taxon
- cowpeaVigna unguiculatat0
- Outcome
- application of P was not essential for grain yield production.e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of P was not essential for grain yield production.”
t0“cowpea”
The same questions in other papers
phosphorus · yield · Vigna unguiculata (cowpea)Results differ
106 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- negative
109 papers more in this group
See all 113 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.