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In Australia, canola was initially grown in more reliable rainfall areas (G>400mm annual rainfall) due to its greater sensitivity to heat and drought than cereals, and the higher production costs increasing risk in more marginal environments (Colton and Potter, 1999). Improved varieties and agronomy, along with the overall farming systems benefits of weed and disease control in cereals, have expanded the area cultivated under canola, and it is now grown in all but the driest margins of the wheat belt.
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Kirkegaard et al. (2016) studied this question.
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