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In this study, we conduct a spatial analysis of soil total phosphorus (TP), acid extractable phosphate (PO4) and the stable oxygen (O) isotope ratio within the PO4 molecule (δ18OPO4) from an intensively managed agricultural grassland site. Total P in the soil was found to range from 736 to 1952mgPkg−1, of which between 12 and 48% was extractable using a 1M HCl (HClPO4) solution with the two variables...
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