Plant Uptake

Plant uptake of solutes is described as passive transport, along with the tran­spiration stream as a function of the solute concentration in the liquid phase. Different roots have different capabilities when it comes to filtering out various solutes. Thus, an empirical concentration factor determines to what extent the available solute is taken up by the plants.

(34.19)   

where R_r is the sink term in the advection-dispersion equation, f_c is the con­centration factor, S_r is the root water uptake and c is the liquid concentration.