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Improving nitrogen and phosphorus management in south-east Australian cropping systems

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Nitrogen (N) and phosphorus (P) fertilisers together constitute one of the largest variable input costs for grain production... Excessive amounts of fertiliser application will not only directly increase input costs but can also lead to yield penalties as well as negative environmental impacts such as greenhouse gas emissions... Current decision support systems, especially those based on soil testing, often underestimate the contribution of all potential soil nutrient pools...
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