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Materials and methods
A model of the farming system known as MIDAS was used to undertake this analysis (Morrison et al.1986) with the objective being increasing profit by 50% and reducing recharge by 50%. The modelwas paramatised with a representative farm at Albany WA, Hamilton Vic and Wagga NSW. At each location three different farming systems where simulated (Table 1). At Albany these comprised of a traditional farm based entirely on annual crops and pastures (1), current best practice consisting of annual crops and pastures plus perennials (2) and a future system of annual crops and perennial pastures (3). At Hamilton a perennial ryegrass (1), a highly productive perennial ryegrass (2) and a highly productive perennial ryegrass plus lucerne and tall fescue (3) systems where simulated. At Wagga a perennial based system was simulated at varying stocking rates and lambing %. All sites simulated a self-replacing wool-meat Merino flock with surplus ewes mated to a terminal sire. Groundwater recharge values were estimated using a farm scale hydrologic model (Beverly et al. 2003).
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FROM 218.240.17.*