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Phosphorus (P) gradually accumulates in surface soils if there is a continuous input of inorganic P fertilizers, manures and composts. In turn, P is lost from soil through runoff and leaching, which lead to increased P concentrations in surface and ground waters. Previous work showed that, in Northern European agricultural soils, below a certain Olsen P concentration (P extractable in 0.5 M NaHCO...
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