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Conservation agriculture and smallholder farming in Africa : the heretics ’ view
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Conservation agriculture is claimed to be a panacea for the problems of poor agricultural productivity and soil degradation in sub-Saharan Africa (SSA). It is actively promoted by international research and development organisations, with such strong advocacy that critical debate is stifled. Claims for the potential of CA in Africa are based on widespread adoption in the Americas, where the effects of tillage were replaced by heavy dependence on herbicides and fertilizers. CA is said to increase yields, to reduce labour requirements, improve soil fertility and reduce erosion. Yet empirical evidence is not clear and consistent on many of these points nor is it always clear which of the principles of CA contribute to the desired effects. Although cases can be found where such claims are supported there are equally convincing scientific reports that contradict these claims. Concerns include decreased yields often observed with CA, increased labour requirements when herbicides are not used, an important gender shift of the labour burden to women and a lack of mulch due to poor productivity and due to the priority given to feeding of livestock with crop residues. Despite the publicity claiming widespread adoption of CA, the available evidence suggests virtually no uptake of CA in most SSA countries, with only small groups of adopters in South Africa, Ghana and Zambia. We conclude that there is an urgent need for critical assessment under which ecological and socio-economic conditions CA is best suited for smallholder farming in SSA. Critical constraints to adoption appear to be competing uses for crop residues, increased labour demand for weeding, and lack of access to, and use of external inputs.
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Metadata
- Authors
- Giller, K. E., Witter, E., Corbeels, M., & Tittonell, P.
- Affiliations
- International Center for Tropical Agriculture (KE)
- Swedish University of Agricultural Sciences (SE)
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (FR)
- Corresponding author
- Giller, Ken E.
- Venue
- Field Crops Research
- Publisher
- Elsevier BV
- Published
- 2009-10
- Volume
- 114
- Issue
- 1
- Pages
- 23-34
- ISSN
- 0378-4290 (ISSN-L)
- OpenAlex
- W2095693034
- Cited by
- 1,499
- References
- 118
- Citations by year
- 2026: 73 · 2025: 75 · 2024: 61 · 2023: 79 · 2022: 82 · 2021: 117 · 2020: 112 · 2019: 109 · 2018: 100 · 2017: 110 · 2016: 103 · 2015: 97 · 2014: 113 · 2013: 83 · 2012: 79
- FWCI
- 102.32
- Type
- journal article
- Language
- en
- Open access
- green
- research.wur.nl
- Locations
- Field Crops Research (publishedVersion)
- Socio-Environmental Systems Modeling (acceptedVersion)
- Agritrop (Cirad) (submittedVersion)
- VTechWorks (Virginia Tech) (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Management and Crop Yield
- Life Sciences › Agricultural and Biological Sciences › General Agricultural and Biological Sciences › Agricultural Innovations and Practices
- Social Sciences › Development › Agriculture, Land Use, Rural Development
- Keywords
- conservation agriculture, smallholder farming, sub-Saharan Africa, technology adoption, crop residues, gender division of labor, soil fertility, soil erosion, herbicides, external inputs, agricultural productivity
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