Ion uptake from soils by plant roots, subject to the Epstein-Hagen relation

Abstract

Diffusion theory has been used to describe the uptake of ions from soils by single roots. Numerical solutions of the relevant differential equation are given for the case where rate of uptake is a nonlinear function of the solution concentration at the root surface. The function employed is derived from a physiological relation described by Epstein and Hagen (1962). Results are compared with those obtained using a common linear approximation.