Weed management in crop-pasture rotations [Western Australia]. [Conference paper]
1989
Ghadim, A.K.A. (Western Australian Univ., Nedlands. School of Agriculture) | Pannell, D.J. (Western Australian Dept. of Agriculture, Perth. Div. of Agricultural Economics and Marketing)
An economic evaluation is made of reducing herbicide usage in crops below recommended levels to increase subsequent pasture production in pasture-crop rotations. The analysis was conducted using MIDAS, a whole-farm linear programming model. Inputs to MIDAS were provided by a simulation model of the weed population and regression models of weed kill from herbicide application and yield response to weed removal. The analysis was of ryegrass (Lolium rigidum) control by Hoegrass in the Merredin region. Results indicated that the gains from increased sheep and wool production and reduced herbicide cost are likely to exceed the losses from reduced grain yield. This conclusion is found to be insensitive to major biological and economic assumptions of the analysis.
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