Profitable Use of Phosphorus Fertiliser for Temperate Pastoral Australia

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1 Corresponding author ABSTRACT : The phosphorus (P) fertiliser required to maximise profit from spring-lambing fine wool Merinos over a range of stocking rates (SR) at Hamilton, Victoria can be expressed as kg of P/dry sheep equivalent (P/DSE). The P/ha required for maximum profit calculated from this ratio can be related to P/ha for maintenance predicted by the New Zealand model of Cornforth and Sinclair. This corresponds to the P required if the SR is 96% of the potential carrying capacity (CC) of the site when pasture utilisation (PU) is set at 90%. To apply this approach elsewhere, the model is used to assess the P required if SR is 96% of CC with 90% PU, and the P/DSE to achieve this is computed. This varied from about 0.8 kg P/DSE for areas with a mean annual rainfall of 700 mm to 0.5 kg P/DSE for a rainfall of 500 mm.

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