Adaptations for growing wheat in the drying climate of Western Australia
Hayden Sprigg A , Robert Belford B E , Steve Milroy C , Sarita Jane Bennett B and David Bowran D
+ Author Affiliations
- Author Affiliations
A ‘Wialki’, Mukinbudin, WA 6473, Australia.
B Curtin University, Department of Environment and Agriculture, Bentley, Perth, WA 6102, Australia.
C CSIRO Plant Industry, Floreat, Perth, WA 6014, Australia; present address: School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.
D Department of Agriculture and Food Western Australia, Baron-Hay Court, South Perth, WA 6151, Australia.
E Corresponding author. Email: r.belford@curtin.edu.au
Crop and Pasture Science 65(7) 627-644 https://doi.org/10.1071/CP13352
Submitted: 18 October 2013 Accepted: 10 March 2014 Published: 30 June 2014
Abstract
This study investigated the effects of predicted changes in rainfall distribution in marginal (≤325 mm annual rainfall) parts of the south-west Australian wheatbelt and options for management and adaptation of the wheat crop. Field experiments with rain-out shelters and irrigation were conducted in 2008 and 2009 to investigate the interactions of rainfall distribution, row spacing, genotype and timing of nitrogen application on growth, water use and grain yield of spring wheat. Water storage before seeding showed potential to maintain or increase yields despite lower in-season rainfall. Widening row spacing reduced biomass and slowed water use but did not increase grain yield, because of increased soil evaporation and water left in the soil at crop maturity.
The Agricultural Production Systems Simulator (APSIM) wheat model was used to investigate the effects of recent and projected climate change on yield in relation to row spacing, phenology and nitrogen. Two climate-change scenarios were applied to historical climatic data to create two plausible future climates (‘optimistic’ and ‘pessimistic’) for the year 2030. None of the strategies tested increased wheat yield under the predicted climate scenarios. Simulated yields at wider row spacings were consistently lower due to insufficient biomass, increased soil evaporation and the inability of the crop to use all of the available water before maturity. Simulated yields of short-season genotypes were always greater than yields of longer season genotypes. Nitrogen regimes had little effect in this study.
This study points to several genotypic traits that could improve the performance of wheat grown at wider row spacings. These include early vigour to reduce soil evaporation and increase competition with weeds, greater tillering/biomass to reduce limitation by sink size, and a vigorous root system with appropriate lateral spread and growth to depth to access available soil water.
Additional keywords: declining rainfall, modelling, phenology, row spacing, wheat varieties.
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