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Climate change mitigation for Australian wheat production.

Aaron T Simmons1, Annette L Cowie2, Philippa M Brock3

  • 1New South Wales Department of Primary Industries, 98 Victoria St, Taree, NSW 2430, Australia.

The Science of the Total Environment
|April 17, 2020
PubMed
Summary

Implementing three key changes to Australian wheat production systems can significantly reduce greenhouse gas (GHG) emissions. This intensification strategy boosts crop yields and mitigates climate change impacts by reducing the need for global land conversion.

Keywords:
Burden shiftingIndirect land use changeIntensification

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Climate Science

Background:

  • Climate change poses a significant threat to humanity.
  • Food production, particularly wheat, is a major contributor to greenhouse gas (GHG) emissions.
  • Strategies to reduce GHG emissions from key global commodities are crucial for climate change mitigation.

Purpose of the Study:

  • To estimate the potential for reducing GHG emissions from Australian wheat production through changes in farming systems.
  • To assess the impact of specific production system modifications on net GHG emissions.
  • To evaluate the national-scale implications of agricultural intensification for climate change mitigation.

Main Methods:

  • Assessed the impact of increasing fertilizer N rates to meet water-limited yield potential.
  • Evaluated the effect of increased lime application frequency on acidic soils.
  • Analyzed the consequences of shifting from a wheat-wheat to a legume-wheat rotation over two years.
  • Modeled changes in net GHG emissions across Australian wheat-growing regions.

Main Results:

  • Predicted a 17.8 Mt increase in wheat and 5.3 Mt increase in legume production over two years.
  • Estimated an 18.4 Mt CO2-e reduction in GHGs from Australian wheat production.
  • Highlighted that intensifying Australian production reduces global pressure to convert forest and grassland to cropland.
  • Demonstrated that agricultural intensification can mitigate climate change.

Conclusions:

  • Intensifying existing agricultural production, specifically wheat systems in Australia, offers a viable strategy for climate change mitigation.
  • The study supports the concept that optimizing agricultural practices can lead to substantial GHG emission reductions.
  • Policy makers should consider the broader environmental impacts of agricultural intensification beyond GHG emissions.