Kiwia, A and Kimani, D and Rebbie, H and Jama, B and Sileshi, G W (2022) Variability in soybean yields, nutrient use efficiency, and profitability with application of phosphorus fertilizer and inoculants on smallholder farms in sub-Saharan Africa. Experimental Agriculture (TSI), 58. pp. 1-13. ISSN 0014-4797
![[img]](http://oar.icrisat.org/style/images/fileicons/application_pdf.png) |
PDF
- Published Version
Available under License ["licenses_description_cc_attribution" not defined]. Download (854kB) |
Abstract
Although soybean is emerging as an important commercial crop in sub-Saharan Africa (SSA), its productivity on smallholder farms is very low. Soybean requires application of phosphorus (P) fertilizer and inoculation with the right rhizobium strains to achieve optimum biological nitrogen fixation and higher yields. However, subsistence farmers in SSA rarely invest in P fertilizers and inoculants due to lack of knowledge of their use and benefits. Most of the early reports on soybean in SSA have been based on work on research stations; hence, information is lacking on the profitability of fertilizer and inoculant use on smallholder farms in SSA. The main hypothesis of the present study was that the combined application of P and inoculants significantly reduces yield risks and increases P use efficiency and profitability compared with P fertilizer alone under smallholder farm conditions. We analyzed a data set of over 2,800 observations from on-farm demonstrations across Ghana, Kenya, Malawi, Rwanda, Tanzania, Uganda, and Zambia. Soybean yields, the partial factor productivity of P (PFPP), agronomic efficiency of P (AEP), and the value cost ratio (VCR) were significantly improved by the combined application of P fertilizer with inoculants than with P fertilizer alone. Combining P and inoculants increased yields over P alone by 17.3% in Kenya, 21.4% in Zambia, 25.7% in Ghana, 56.4% in Tanzania, and 57.1% in Malawi. However, soil organic matter was an important determinant of yield response and P use efficiency. The VCR increased linearly with increasing AEP in P + inoculant (R2 = 0.829) and less so with P fertilizer alone (R2 = 0.672). Net present values were positive in all countries, indicating that investments in P fertilizer and inoculants will generate profits over time. In order to increase uptake of fertilizers and inoculants among subsistence farmers and make soybean production more profitable, appropriate policies and market incentives need to be created.
| Item Type: | Article |
|---|---|
| Divisions: | Research Program : East & Southern Africa |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | Agronomic efficiency, Diversification, Profitability |
| Subjects: | Others > Fertilizer Applications Others > Sub-Saharan Africa |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 04 Apr 2024 11:01 |
| Last Modified: | 04 Apr 2024 11:01 |
| URI: | http://oar.icrisat.org/id/eprint/12615 |
| Official URL: | https://www.cambridge.org/core/journals/experiment... |
| Projects: | UNSPECIFIED |
| Funders: | Bill & Melinda Gates Foundation |
| Acknowledgement: | We are grateful to the Bill and Melinda Gates Foundation for the funding to AGRA. We also thank grantees and partners in the recipient countries that implemented the projects reported in this paper. Specifically, we would like to thank the Savanna Agricultural Research Institute in Ghana, Kenyatta University in Kenya, Kenya Agricultural and Livestock Research Organization, Rural Outreach Program in Kenya, Clinton Development Initiative in Malawi and Rwanda, the Ministry of Agriculture, Food Security and Cooperatives in Tanzania, National Agricultural Research Organisation in Uganda, Millennium Promise in Uganda, Millennium Villages Africa 2000 Network in Uganda, and the Zambia Agriculture Research Institute. |
| Links: |
Actions (login required)
 |
View Item |
Altmetric
Altmetric