Phosphorus uptake by L. is quantitatively predicted by infinite sink extraction of soil P.

Background And Aims: Sink extraction of phosphorus from soils has been utilised to study soil P desorption kinetics and as index of plant availability, but not for quantitative prediction of P uptake by plants. Here we investigate the potential of a modified sink extraction method for determining P desorption kinetics and for quantifying plant available soil P.

Methods: Modified diffusive gradients in thin films samplers were immersed in shaken soil suspensions for long-term extraction of soil P.