Fig. 2. Comparison between the cumulative vertical weighting [W(h)] calculated from TDR-measured soil water content () and bulk soil electrical conductivity (EC_b) as a function of distance to the soil surface (h) at two different soil water contents: (a) = 0.153 m³ m^-3 and (b) = 0.244 m³ m^-3. Also shown is the universal cumulative vertical weighting function (Eq. [15]) for the TDR probe shown in Fig. 1a (solid line).