Quantifying citrate-enhanced phosphate root uptake using microdialysis

Abstract

A single root exuding citrate at a typical rate (4.3 × 10^-5 μmol m^-1 of root h^-1) did not contribute significantly to P uptake. Microdialysis probes show promise for measuring rhizosphere processes when calibration experiments and mathematical modelling are used to decouple microdialysis and rhizosphere mechanisms.