How climate-smart is conservation agriculture (CA)? – its potential to deliver on adaptation, mitigation and productivity on smallholder farms in southern Africa

Thierfelder, C and Chivenge, P and Mupangwa, W and Rosenstock, T S and Lamanna, C and Eyre, J X (2017) How climate-smart is conservation agriculture (CA)? – its potential to deliver on adaptation, mitigation and productivity on smallholder farms in southern Africa. Food Security, 9 (3). pp. 537-560. ISSN 1876-4517

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Abstract

Climate resilient cropping systems are required to adapt to the increasing threats of climate change projected for Southern Africa and to better manage current climate variability. Conservation agriculture (CA) has been proposed among technologies that are climate-smart. For a cropping system to be labelled “climate-smart” it has to deliver three benefits: a) adapt to the effects of climate and be of increased resilience; b) mitigate climate effects by sequestering carbon (C) and reducing greenhouse gas emissions (GHG); and c) sustainably increase productivity and income. Research on smallholder farms from Southern Africa was analysed to assess if CA can deliver on the three principles of climate-smart agriculture. Results from Southern Africa showed that CA systems have a positive effect on adaptation and productivity, but its mitigation potential lags far behind expectations. CA systems maintain higher infiltration rates and conserve soil moisture, which helps to overcome seasonal dry-spells. Increased productivity and profitability were recorded although a lag period of 2–5 cropping seasons is common until yield benefits become significant. Immediate economic benefits such as reduced labour requirements in some systems will make CA more attractive in the short term to farmers who cannot afford to wait for several seasons until yield benefits accrue. The available data summarizing the effects of CA on soil organic C (SOC) and reductions in greenhouse gases, are often contradictory and depend a great deal on the agro-ecological environment and the available biomass for surface residue retention. There is an urgent need for more research to better quantify the mitigation effects, as the current data are scanty. Possible co-interventions such as improved intercropping/relay cropping systems, agroforestry and other tree-based systems may improve delivery of mitigation benefits and need further exploration.

Item Type: Article
Divisions: Research Program : East & Southern Africa
CRP: CGIAR Research Program on Water, Land and Ecosystems
Uncontrolled Keywords: No-tillage, Sustainable intensification, Resilience, Climate-smart agriculture, Climate variability, Smallholder farms, Southern Africa, Conservation agriculture, CA, CSA technologies, Maize, Climate mitigation, Climate adaptation, Agriculture Productivity
Subjects: Others > Climate Adaptation
Others > Climate Mitigation
Others > Climate Smart Agriculture (CSA)
Others > Maize
Others > Climate change
Others > African Agriculture
Others > Southern Africa
Depositing User: Mr Ramesh K
Date Deposited: 05 Jul 2017 05:32
Last Modified: 05 Sep 2017 05:11
URI: http://oar.icrisat.org/id/eprint/10078
Official URL: http://dx.doi.org/10.1007/s12571-017-0665-3
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: The authors acknowledge the logistical support of CIMMYT, ICRISAT, ICRAF and QUAAFI who have supported this study at various stages. Funding is gratefully acknowledged from the CGIAR Research Programs CCAFS and MAIZE. We thank the farmers, extension officers, field coordinators and researchers from the national programs of Malawi, Zambia, Mozambique and Zimbabwe. Special thanks go the Total LandCare for supporting CIMMYT’s research on CA systems inMalawi, Zambia and Mozambique for more than a decade.
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