Journal
JOURNAL OF CLEANER PRODUCTION
Volume 83, Issue -, Pages 194-203Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2014.07.020
Keywords
Agriculture; Economic analysis; Grain production; Greenhouse gas emissions; Nitrous oxide; Streamline life cycle assessment
Categories
Funding
- Australian Government's Climate Change Research Program
- Grains Research and Development Corporation (GRDC)
- Department of Agriculture & Food Western Australia (DAFWA)
- University of Western Australia
- GRDC
- Australian Postgraduate Award
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Agriculture production contributes to global warming directly via the release of carbon dioxide (CO2), methane and nitrous oxide emissions, and indirectly through the consumption of inputs such as fertilizer, fuel and herbicides. We investigated if including a grain legume (Lupinus angustifolius) in a cropping rotation, and/or applying agricultural lime to increase the pH of an acidic soil, decreased greenhouse gas (GHG) emissions from wheat production in a semi-arid environment by conducting a streamlined life cycle assessment analysis that utilized in situ GHG emission measurements, rather than international default values. We also assessed the economic viability of each GHG mitigation strategy. Incorporating a grain legume in a two year cropping rotation decreased GHG emissions from wheat production by 56% on a per hectare basis, and 35% on a per tonne of wheat basis, primarily by lowering nitrogen fertilizer inputs. However, a large incentive ($93 per tonne of carbon dioxide equivalents reduced) was required for the inclusion of grain legumes to be financially attractive. Applying lime was profitable but increased GHG emissions by varying amounts depending upon whether the lime was assumed to dissolve over one, five or 10 years. We recommend further investigating the impact of liming on both CO2 and non-CO2 emissions to accurately account for its effect on GHG emissions from agricultural production. (C) 2014 Elsevier Ltd. All rights reserved.
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