Early sowing systems can boost Australian wheat yields despite recent climate change

James R. Hunt (), Julianne M. Lilley, Ben Trevaskis, Bonnie M. Flohr, Allan Peake, Andrew Fletcher, Alexander B. Zwart, David Gobbett and John A. Kirkegaard
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James R. Hunt: La Trobe University
Julianne M. Lilley: CSIRO Agriculture and Food
Ben Trevaskis: CSIRO Agriculture and Food
Bonnie M. Flohr: CSIRO Agriculture and Food
Allan Peake: CSIRO Agriculture and Food
Andrew Fletcher: CSIRO Agriculture and Food
Alexander B. Zwart: Data61 CSIRO
David Gobbett: CSIRO Agriculture and Food
John A. Kirkegaard: CSIRO Agriculture and Food

Nature Climate Change, 2019, vol. 9, issue 3, 244-247

Abstract: Abstract Price surges in staple foods trigger civil unrest and conflict1. The food riots of 2007–2008 and Arab spring uprisings (2010–2012) were, in part, a consequence of price increases due to a tightening supply of staple grains, particularly wheat. Prolonged drought in Australia contributed to the global wheat shortage; Australia accounts for 10% of global wheat exports2. Australian wheat yields have plateaued3 owing to reduced rainfall4,5 and increasing temperatures3 attributed to anthropogenic climate change6. If Australia is to increase wheat production in line with projected global population growth and demand, an increase in yield is required7. Crop simulations reveal that an early sowing system combined with slower-developing wheat genotypes could exploit a longer growing season8. We developed near-isogenic lines and tested this hypothesis in experiments across the grain belt of Australia, and extended the results using whole-farm simulations. Our proposed early sowing system can increase national yields by 0.54 (s.d. = 0.38) t ha−1 representing an additional 7.1 Mt annually under reduced rainfall and increasing temperature regimes. This adaptation could facilitate increasing yields across Australia under climate change with global food security benefits.

Date: 2019
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DOI: 10.1038/s41558-019-0417-9

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