Abstract
Core Ideas Indigenous RP has possibility as an alternative P source of mineral P fertilizer. Seven cowpea genotypes were identified as good responders to RP application. Application amount at 57 mg P kg −1 as RP was optimum amount for cowpea. Micro‐dosing technic was appropriate for applying powdery RP in the fields. Cowpea [ Vigna unguiculata (L.) Walp.] plays an important role in the livelihoods of the people of sub‐Saharan Africa, but phosphorus (P) deficiency in soils is a serious problem that contributes to low productivity. This study was conducted to verify the efficiency of indigenous rock phosphate (RP) as a P source to promote this affordable method of soil management to farmers. Pot experiments were conducted to identify good responder genotypes to RP application and its effect in cowpea cultivation using low‐P soil from Fashola village in southwestern Nigeria and Togolese RP (34% P 2 O 5 ). Shoot dry weight (SDW) at 8 wk after seeding (WAS) was significantly correlated with P uptake ( r = 0.817; P < 0.01) and was therefore used as an indicator to select good responder genotypes. Sixteen of the 28 tested genotypes showed a low rate of decrease of SDW at 8 WAS under Togolese RP applications of 171 mg P kg −1 compared with 30 mg P kg −1 (as KH 2 PO 4 ). Seven of these genotypes (Iron bean, IT87D‐941–1, IT97K‐499–38, DanIla, IT95K‐1543, IT97K‐556–4, and IT90K‐284–2) showed a significantly higher SDW at 8 WAS compared with IT97K‐499–35. In four of the seven good responders, the SDWs at 8 WAS were significantly higher and grain yield tended to be higher with ≥57 mg P kg −1 compared with zero application. Under field conditions, the micro‐dosing technic is recommended for applying RP to avoid loss and to enhance the availability of P for cowpea cultivation.
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Claims 7
Claim · model-written summary
Shoot dry weight at 8 weeks after seeding was significantly correlated with P uptake in cowpea.
- Taxon
- Vigna unguiculata
Vigna unguiculatae1 - Organ / stage
- Shoote2
- Outcome
- P uptakee2
- Value
- r = 0.817; P < 0.01e2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cowpea [ Vigna unguiculata (L.) Walp.]”
e2“Shoot dry weight (SDW) at 8 wk after seeding (WAS) was significantly correlated with P uptake ( r = 0.817; P < 0.01 )”
Claim · model-written summary
Sixteen of 28 cowpea genotypes showed a low rate of decrease of shoot dry weight under Togolese RP at 171 mg P per kg compared with 30 mg P per kg.
- Taxon
- Vigna unguiculataVigna unguiculatae1
- Material
- tested genotypese3
- Treatment
- Togolese RP applications of 171 mg P kg −1e3
- Outcome
- SDWe3
- Direction
- low rate of decreasee3
- Comparator
- 30 mg P kg −1e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cowpea [ Vigna unguiculata (L.) Walp.]”
e3“Sixteen of the 28 tested genotypes showed a low rate of decrease of SDW at 8 WAS under Togolese RP applications of 171 mg P kg −1 compared with 30 mg P kg −1 (as KH 2 PO 4 )”
Claim · model-written summary
Seven cowpea genotypes had significantly higher shoot dry weight at 8 weeks after seeding than genotype IT97K-499-35.
- Taxon
- Vigna unguiculataVigna unguiculatae1
- Outcome
- SDWe4
- Direction
- significantly highere4
- Comparator
- IT97K‐499–35e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cowpea [ Vigna unguiculata (L.) Walp.]”
e4“showed a significantly higher SDW at 8 WAS compared with IT97K‐499–35”
Claim · model-written summary
In four of the seven good responders, shoot dry weight at 8 weeks after seeding was significantly higher with 57 mg P per kg or more of RP than with zero application.
- Taxon
- Vigna unguiculataVigna unguiculatae1
- Material
- good responderse5
- Treatment
- ≥57 mg P kg −1e6
- Outcome
- SDWe5
- Direction
- significantly highere5
- Comparator
- zero applicatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cowpea [ Vigna unguiculata (L.) Walp.]”
e5“In four of the seven good responders, the SDWs at 8 WAS were significantly higher”
e6“grain yield tended to be higher with ≥57 mg P kg −1 compared with zero application”
Claim · model-written summary
Grain yield tended to be higher in cowpea with 57 mg P per kg or more of RP than with zero application.
- Taxon
- Vigna unguiculataVigna unguiculatae1
- Treatment
- ≥57 mg P kg −1e6
- Outcome
- grain yielde6
- Direction
- tended to be highere6
- Comparator
- zero applicatione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cowpea [ Vigna unguiculata (L.) Walp.]”
e6“grain yield tended to be higher with ≥57 mg P kg −1 compared with zero application”
Claim · model-written summary
The authors recommend the micro-dosing technique for applying rock phosphate in cowpea fields.
- Taxon
- cowpeaVigna unguiculatae7
- Treatment
- micro‐dosing technice7
- Outcome
- applying RPe7
- Setting
- field conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Cowpea [ Vigna unguiculata (L.) Walp.]”
e7“Under field conditions, the micro‐dosing technic is recommended for applying RP to avoid loss and to enhance the availability of P for cowpea cultivation”
Claim · model-written summary
A rock phosphate application of 57 mg P per kg was the optimum amount for cowpea.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- Application amount at 57 mg P kg −1 as RPe0
- Outcome
- optimum amounte0
- Value
- 57 mg P kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application amount at 57 mg P kg −1 as RP was optimum amount for cowpea”
The same questions in other papers
phosphorus · growth · Vigna unguiculata (cowpea)Results differ
51 papers in the same direction as this paper · 4 in the opposite direction
- positive
- negative
- negative
52 papers more in this group
See all 56 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.