Managing for least cost rather than most profit.. In summary - For the effort of spraying the paddock twice over summer and an investment of $30/ha, a gain could be achieved in the following wheat crop of $105/ha.. P fertiliser should not be broadcast prior to seeding in 2008 because this approach is only justified in situations where soil P reserves are high and dressings are designed to maintain those reserves - in 2008 simply do not broadcast those paddocks and use the money saved on other inputs which will return better profits...
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prior soil test
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