McCarthy, Alison and Hancock, Nigel and Raine, Steven R. (2010) Simulation of adaptive site-specific irrigation control performance with spatially variable rainfall. In: Australian Irrigation Conference and Exibition 2010: One Water Many Futures, 8-10 Jun 2010, Sydney, Australia.
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Abstract
Irrigation control strategies can be used to improve site-specific irrigation. These control strategies generally require weather, plant and/or soil data to determine irrigation volumes and/or timing that improve crop water use efficiency while maintaining or improving crop yield. A simulation framework ‘VARIwise’ has been created to develop, simulate and evaluate site-specific irrigation control strategies for centre pivot and lateral move irrigation machines (McCarthy et al., 2010), and the cotton crop growth model OZCOT is currently integrated to evaluate strategies. In VARIwise, the field is divided into 1 m2 cells to accommodate spatial variability and alternative irrigation control strategies have been implemented (McCarthy, 2010).
The spatial variability of natural rainfall in Queensland summer cropping areas is observed to be substantial on a scale of 10s to 100s of metres due to highly-localised cumulonimbus storms. Typically an automatic weather station or other data source will only provide rainfall data for a single point nearby, hence this variability is often unquantified and the effect on irrigation optimisation unknown. Using VARIwise, two adaptive control strategies were evaluated for performance and robustness to simulated spatial variability of rainfall.
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