Fig. 4. Comparison between the actual distribution of relative electrical conductivity (EC), TDR-measured relative bulk soil electrical conductivity (EC_b) and the theoretical distribution of TDR-measured relative EC_b as a function of distance to the interface between the half-cells at (a) the beginning (t = 0 d) and (b) 5.9 d after the half-cells were assembled in the diffusion experiment (Method I) carried out at = 0.244 m³ m^-3.