Journal article

Integrating crop modelling and production economics to investigate multiple nutrient deficiencies and yield gaps

Kerry J Stott, Brendan Christy, Malcolm McCaskill, Kurt K Benke, Penny Riffkin, Garry J O'Leary, Robert Norton

The Australian Journal of Agricultural and Resource Economics | Wiley | Published : 2020


A method is described for integrating crop modelling and production economics to quantify optimum applications of multiple nutrients and yield gaps. The method is demonstrated for crop production in the high‐rainfall zone of southern Australia. Data from a biophysical crop model were used to overcome the persistent problem of inadequate experimental data. The Mitscherlich function was expanded to accommodate four variable inputs – nitrogen, phosphorus, potassium and sulphur – and the expansion path was used to determine the economic optimum application of all four nutrients. Modelling revealed the state‐contingent yield potential and the extent to which unrealised yield could be explained by..

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Awarded by Grains Research and Development Corporation

Funding Acknowledgements

This research was funded through the Grains Research and Development Corporation (DAV00141) and the Victorian State Government. The primary author would like to thank Professor Bill Malcolm, University of Melbourne, for his encouragement and support during this project.