Abstract:
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Before the start of each growing season, farmers in Western Australia need to estimate the likelihood of an economic return from fertiliser applications. To estimate how much phosphatic fertiliser to apply you must know the current phosphorus status of the soil. This Farmnote covers errors associated with soil testing, including laboratory analysis, natural variation of soil, management variation, depth of sampling, variation over time and variations in soil test phosphorus calibration curves. It also pro
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