Abstract
. At 50% flowering, changes in selected rhizosphere soil properties (pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity), nodule count, phytochemicals (phenols, flavonoids, alkaloids, tannins, saponins) and antioxidant property of cowpea roots and leaves were determined by standard laboratory procedures. Differences between means of the measured parameters were established using ANOVA, and relationships among the parameters were explored using Pearson correlation (p < 0.05). Addition of biochar solely or in combination with TSP significantly (p < 0.05) increased soil pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity and root nodule count. Flavonoids, phenols, alkaloids, saponin, tannin contents and antioxidant activity in the roots and leaves were significantly (p < 0.05) higher in the amended soils compared with the unamended soil. Similarly, soil flavonoids, phenols, alkaloids and antioxidant activity were significantly higher in amended soils compared with control. Significant, positive inter and intra correlation with varying strength was found between soil properties, nodule number and phytoconstituents. This is an indication that biochar can be co-applied with triple superphosphate to sustain soil fertility, improve nodulation and enhance concentrations of phytoconstituents in soil, cowpea roots and leaves.
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Claims 9
Claim · model-written summary
Biochar alone or with TSP significantly increased rhizosphere soil pH, nitrogen, and available phosphorus.
- Taxon
- cowpea
Vigna unguiculatae1 - Treatment
- biochar solely or in combination with TSPe0
- Outcome
- soil pH, total nitrogen, available phosphoruse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of biochar solely or in combination with TSP significantly (p < 0.05) increased soil pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity and root nodule count.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Biochar alone or with TSP significantly increased soil organic carbon and cation exchange capacity.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- biochar solely or in combination with TSPe0
- Outcome
- soil organic carbon, cation exchange capacitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of biochar solely or in combination with TSP significantly (p < 0.05) increased soil pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity and root nodule count.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Biochar alone or with TSP significantly increased cowpea root nodule count.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- biochar solely or in combination with TSPe0
- Outcome
- root nodule counte0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of biochar solely or in combination with TSP significantly (p < 0.05) increased soil pH, total nitrogen, available phosphorus, soil organic carbon, cation exchange capacity and root nodule count.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Amended soils significantly raised flavonoid, phenol, and alkaloid contents in cowpea roots and leaves relative to unamended soil.
- Taxon
- cowpeaVigna unguiculatae1
- Organ / stage
- roots and leavese0
- Treatment
- amended soilse0
- Outcome
- Flavonoids, phenols, alkaloidse0
- Direction
- highere0
- Comparator
- unamended soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flavonoids, phenols, alkaloids, saponin, tannin contents and antioxidant activity in the roots and leaves were significantly (p < 0.05) higher in the amended soils compared with the unamended soil.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Amended soils significantly raised saponin and tannin contents in cowpea roots and leaves relative to unamended soil.
- Taxon
- cowpeaVigna unguiculatae1
- Organ / stage
- roots and leavese0
- Treatment
- amended soilse0
- Outcome
- saponin, tannin contentse0
- Direction
- highere0
- Comparator
- unamended soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flavonoids, phenols, alkaloids, saponin, tannin contents and antioxidant activity in the roots and leaves were significantly (p < 0.05) higher in the amended soils compared with the unamended soil.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Amended soils significantly raised antioxidant activity in cowpea roots and leaves relative to unamended soil.
- Taxon
- cowpeaVigna unguiculatae1
- Organ / stage
- roots and leavese0
- Treatment
- amended soilse0
- Outcome
- antioxidant activitye0
- Direction
- highere0
- Comparator
- unamended soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Flavonoids, phenols, alkaloids, saponin, tannin contents and antioxidant activity in the roots and leaves were significantly (p < 0.05) higher in the amended soils compared with the unamended soil.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Soil flavonoids, phenols, alkaloids, and antioxidant activity were significantly higher in amended soils than control soil.
- Taxon
- cowpeaVigna unguiculatae1
- Treatment
- amended soilse0
- Outcome
- soil flavonoids, phenols, alkaloids and antioxidant activitye0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil flavonoids, phenols, alkaloids and antioxidant activity were significantly higher in amended soils compared with control.”
e1“of cowpea roots and leaves”
Claim · model-written summary
Soil properties, nodule number, and phytoconstituents had significant positive correlations of varying strength.
- Taxon
- cowpeaVigna unguiculatae1
- Outcome
- nodule number and phytoconstituentse0
- Direction
- positivee0
- Setting
- soil propertiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant, positive inter and intra correlation with varying strength was found between soil properties, nodule number and phytoconstituents.”
e1“of cowpea roots and leaves”
Claim · model-written summary
The authors suggest co-applying biochar and triple superphosphate to sustain fertility, improve nodulation, and raise cowpea phytoconstituents.
- Taxon
- cowpeaVigna unguiculatae0
- Treatment
- biochare0
- Outcome
- co-applied with triple superphosphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“biochar can be co-applied with triple superphosphate to sustain soil fertility, improve nodulation and enhance concentrations of phytoconstituents in soil, cowpea roots and leaves.”
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See all 9 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.