Abstract
Nutrient-poor soils coupled with micronutrient deficiency among many rural resource-poor communities remain a challenge in sub-Saharan Africa. Nutrient-poor soils can be managed through various soil amendment or fertilisation strategies. Micronutrients can be supplied through plants. The study was aimed at determining the symbiotic nitrogen fixation of cowpea as well as the contribution of inter-cropping under varying levels of nitrogen, phosphorus, and potassium (NPK) fertilisation. In addition, the amount of micronutrients supplied by cowpea and amaranth were determined. The experiment was laid out in a 2 × 4 factorial treatment structure in a completely randomised design, with inter-cropping (cowpea and amaranth) and fertiliser (control, 25%, 50%, and 100% of the recommended NPK levels) as treatment factors with four replications. Symbiotic N2 fixation of cowpea decreased from 341–448 kgN.ha−1 to 77–91 kgN.ha−1 for the first year and 557–227 kgN.ha−1 to 92−164 kgN.ha−1 for the second year with fertilisation. The iron and zinc nutritional yield increased (61–210 g.ha−1 for first year and 304–867 g.ha−1, for second year), proportional to fertiliser application to both crops. The research shows the benefits of leguminous crops in soil nutrient fertility and inorganic fertilisation with inter-cropping in managing micronutrient deficiency to meet the nutritional needs of rural communities.
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Claims 4
Claim · model-written summary
Fertilization lowered cowpea symbiotic nitrogen fixation in year one.
- Taxon
- cowpea
Vigna unguiculatae0 - Treatment
- fertilisatione0
- Outcome
- Symbiotic N2 fixatione0
- Direction
- decreasede0
- Value
- 77–91 kgN.ha−1e0
- Comparator
- 341–448 kgN.ha−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Symbiotic N2 fixation of cowpea decreased from 341–448 kgN.ha−1 to 77–91 kgN.ha−1 for the first year and 557–227 kgN.ha−1 to 92−164 kgN.ha−1 for the second year with fertilisation”
Claim · model-written summary
Fertilization lowered cowpea symbiotic nitrogen fixation in year two.
- Treatment
- fertilisatione0
- Direction
- decreaseinferrede0
- Value
- 92−164 kgN.ha−1e0
- Comparator
- 557–227 kgN.ha−1e0
Not reportedTaxonOutcome
Verbatim
e0“557–227 kgN.ha−1 to 92−164 kgN.ha−1 for the second year with fertilisation”
Claim · model-written summary
Iron nutritional yield rose in proportion to fertilizer application.
Verbatim
e0“The iron and zinc nutritional yield increased (61–210 g.ha−1 for first year and 304–867 g.ha−1, for second year), proportional to fertiliser application to both crops”
Claim · model-written summary
Zinc nutritional yield rose in proportion to fertilizer application.
Verbatim
e0“The iron and zinc nutritional yield increased (61–210 g.ha−1 for first year and 304–867 g.ha−1, for second year), proportional to fertiliser application to both crops”
The same questions in other papers
fertilization · symbiosis · Vigna unguiculata (cowpea)Positive and negative results
6 papers in the same direction as this paper · 44 in the opposite direction
- positive
- positive
- positive
47 papers more in this group
See all 51 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.