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Decoupling crop production from water consumption at some irrigation schemes in southern Africa

Author

Listed:
  • Wellington, Michael
  • Kuhnert, Petra
  • Lawes, Roger
  • Renzullo, Luigi
  • Pittock, Jamie
  • Ramshaw, Peter
  • Moyo, Martin
  • Kimaro, Emmanuel
  • Tafula, Miguel
  • van Rooyen, Andre

Abstract

Improving crop productivity is crucial to food security and rural livelihoods in southern Africa. However, agricultural intensification at irrigation schemes may place greater demands on water resources, even where water use efficiency (WUE) is improved, due to the paradox of irrigation efficiency. We analysed trends in water use efficiency (WUE), Gross Primary Productivity (GPP), evapotranspiration (ET), evaporation (E), and transpiration (T) at six irrigation schemes which received technological and social interventions. GPP was decoupled from ET at some schemes. For example, at the Landela sub-block of the Silalatshani irrigation scheme in Zimbabwe, GPP and T increased at 4.8% and 4.6% per year, respectively. Conversely, E decreased at 13.5% per year, giving a 3.6% decrease in ET per year from 2013 to 2021. This suggests that crop production can be decoupled from water consumption at southern African irrigation schemes, meaning it is possible to produce more food with less water.

Suggested Citation

  • Wellington, Michael & Kuhnert, Petra & Lawes, Roger & Renzullo, Luigi & Pittock, Jamie & Ramshaw, Peter & Moyo, Martin & Kimaro, Emmanuel & Tafula, Miguel & van Rooyen, Andre, 2023. "Decoupling crop production from water consumption at some irrigation schemes in southern Africa," Agricultural Water Management, Elsevier, vol. 284(C).
    • Handle: RePEc:eee:agiwat:v:284:y:2023:i:c:s0378377423002238
    DOI: 10.1016/j.agwat.2023.108358
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    Cited by:

    1. Pittock, Jamie, 2024. "Sustainable intensification: Decoupling resource use from socio-economic benefits in southern Africa," 2023: Global Food Security in a Riskier World-Diversification for resilient food and nutrition systems, 4-5 September 2023 339628, Crawford Fund.
    2. Lankford, Bruce A., 2023. "Resolving the paradoxes of irrigation efficiency: Irrigated systems accounting analyses depletion-based water conservation for reallocation," Agricultural Water Management, Elsevier, vol. 287(C).

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