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The Environmental Mitigation Potential of Photovoltaic-Powered Irrigation in the Production of South African Maize

Author

Listed:
  • Sarah Wettstein

    (Institute of Natural Resource Sciences, Zurich University of Applied Sciences, 8820 Wädenswil, Switzerland)

  • Karen Muir

    (Institute of Natural Resource Sciences, Zurich University of Applied Sciences, 8820 Wädenswil, Switzerland)

  • Deborah Scharfy

    (Institute of Natural Resource Sciences, Zurich University of Applied Sciences, 8820 Wädenswil, Switzerland)

  • Matthias Stucki

    (Institute of Natural Resource Sciences, Zurich University of Applied Sciences, 8820 Wädenswil, Switzerland)

Abstract

Agriculture is under pressure to reduce its environmental impact. The use of renewable energy sources has potential to decrease these impacts. Maize is one of the most significant crops in South Africa and approximately 241,000 hectares are irrigated. This irrigation is most commonly powered by grid electricity generated using coal. However, South Africa has high solar irradiation, which could be used to generate photovoltaic electricity. The aim of this study was to determine the environmental mitigation potential of replacing grid-powered irrigation in South African maize production with photovoltaic irrigation systems using Life Cycle Assessment. The study included the value chain of maize production from cultivation to storage. Replacing grid electricity with photovoltaic-generated electricity leads to a 34% reduction in the global warming potential of maize produced under irrigation, and—applied at a national level—could potentially reduce South Africa’s greenhouse gas emissions by 536,000 t CO 2 -eq. per year. Non-renewable energy demand, freshwater eutrophication, acidification, and particulate matter emissions are also significantly lowered. Replacing grid electricity with renewable energy in irrigation has been shown to be an effective means of reducing the environmental impacts associated with South African maize production.

Suggested Citation

  • Sarah Wettstein & Karen Muir & Deborah Scharfy & Matthias Stucki, 2017. "The Environmental Mitigation Potential of Photovoltaic-Powered Irrigation in the Production of South African Maize," Sustainability, MDPI, vol. 9(10), pages 1-20, September.
    • Handle: RePEc:gam:jsusta:v:9:y:2017:i:10:p:1772-:d:113827
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    References listed on IDEAS

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    6. Miguel Ángel Pardo Picazo & Juan Manzano Juárez & Diego García-Márquez, 2018. "Energy Consumption Optimization in Irrigation Networks Supplied by a Standalone Direct Pumping Photovoltaic System," Sustainability, MDPI, vol. 10(11), pages 1-17, November.
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