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Crop use of fertiliser, topsoil and subsoil phosphorus

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Crop Use of Fertiliser, Topsoil and Subsoil P We had 7 experiments in the field under rain-out shelters where we directly measured the uptake of P fertiliser (using radioisotope) under wet (decile 7-8) and dry (decile 2-3) in-season conditions... We applied P fertiliser containing a radioactive tracer that gives the fertiliser a unique 'fingerprint' so that we could track the uptake of fertiliser into the plant... We are examining the value of information that might support decision making around P management including the value of accurate soil P testing and the value of being able to estimate when soil P fertility will fall below sufficiency using modelling techniques...