Phosphorus (P) is one of the most expensive nutrient inputs used in broadacre cropping in Australia and globally. Therefore, there is major economic benefit in developing a soil test capable of accurately predicting the P status of a soil, to facilitate efficient fertiliser strategies for crop and pasture production and reduce the risks of environmental pollution due to over fertilisation. Numerous soil P tests have been used in the past to estimate the soils capacity to supply P to a crop throughoutthe growth period. All these tests vary in there methodology and therefore making interpretation between each is difficult. Chemical extraction methods remain the most popular with soil testing companies and they can provide rapid analysis and sample throughput.
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