 Challenges and opportunities for enhancing food security and greenhouse gas mitigation in smallholder farming in sub-Saharan Africa. A reviewDong-Gill Kim (),
Elisa Grieco,
Antonio Bombelli,
Jonathan E. Hickman and
Alberto Sanz-Cobena
Food Security: The Science, Sociology and Economics of Food Production and Access to Food, 2021, vol. 13, issue 2, No 14, 457-476 Abstract: Abstract Smallholder farmers struggle to achieve food security in many countries of sub-Saharan Africa (SSA). It is urgently required to find appropriate practices for enhancing crop production while avoiding large increases in greenhouse gas (GHG) emissions in SSA. This review aims to identify common smallholder farming practices for enhancing crop production, to assess how these affect GHG emissions and to identify strategies that not only enhance crop production but also mitigate GHG emissions in SSA. To increase crop production and ensure food security, smallholder farmers usually expand agricultural land, develop water harvesting and irrigation techniques and increase cropping intensity and fertilizer use. These practices may result in changing carbon stocks and GHG emissions, potentially creating trade-offs between food security and GHG mitigation. Agricultural land expansion at the expense of forests is the most dominant source of GHG emissions in SSA. While water harvesting and irrigation can increase soil organic carbon, they can trigger GHG emissions. Increasing cropping intensity can enhance the decomposition of soil organic matter, thus releasing carbon dioxide. Increasing nitrogen fertilizer use can enhance soil organic carbon, but also leads to increasing nitrous oxide emissions. An integrated land, water and nutrient management strategy is necessary to enhance crop production and mitigate GHG emissions. Among the most relevant strategies found, agroforesty practices in degraded and marginal lands could replace expanding agricultural croplands. In addition, water management, via adequate rainwater harvesting and irrigation techniques, together with appropriate nutrient management should be considered. Therefore, a land-water-nutrient nexus (LWNN) approach will enable an integrated and sustainable solution to increasing crop production and mitigating GHG emissions. Various technical, economic and policy barriers hinder implementing the LWNN approach on the ground, but these may be overcome through developing appropriate technologies, disseminating them through farmer to farmer approaches and developing specific policies to address smallholder land tenure issues and motivate long-term investment. Keywords: Sub-Saharan Africa; Smallholder farming systems; Crop production; Greenhouse gas emission; Agricultural land; water harvesting; irrigation; cropping intensity; fertilizer (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:spr:ssefpa:v:13:y:2021:i:2:d:10.1007_s12571-021-01149-9 Ordering information: This journal article can be ordered from DOI: 10.1007/s12571-021-01149-9 Access Statistics for this article Food Security: The Science, Sociology and Economics of Food Production and Access to Food is currently edited by R.N. Strange More articles in Food Security: The Science, Sociology and Economics of Food Production and Access to Food from Springer, The International Society for Plant Pathology |
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