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

Thierfelder, Christian, Chivenge, Pauline, Mupangwa, Walter, Rosenstock, Todd S., Lamanna, Christine and Eyre, Joseph 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: 537-560. doi:10.1007/s12571-017-0665-3


Author Thierfelder, Christian
Chivenge, Pauline
Mupangwa, Walter
Rosenstock, Todd S.
Lamanna, Christine
Eyre, Joseph X.
Title How climate-smart is conservation agriculture (CA)? – its potential to deliver on adaptation, mitigation and productivity on smallholder farms in southern Africa
Journal name Food Security   Check publisher's open access policy
ISSN 1876-4525
1876-4517
Publication date 2017-04-07
Sub-type Article (original research)
DOI 10.1007/s12571-017-0665-3
Open Access Status Not yet assessed
Volume 9
Issue 3
Start page 537
End page 560
Total pages 24
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Language eng
Subject 1106 Food Science
3303 Development
1102 Agronomy and Crop Science
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.
Keyword Climate variability
Climate-smart agriculture
No-tillage
Resilience
Sustainable intensification
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Queensland Alliance for Agriculture and Food Innovation
 
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