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Fig. 1. Comparison of the data and equation of Rhoades et al. (1976) and a percolation-based formulation. The two equations produce similar curves when plotted with (a) linear axes; differences are clearer in (b) logarithmic space. ( ${theta}$ , volumetric water content; ${theta}$ _c, critical water content; ${sigma}$ , electrical conductivity; ${sigma}$ _b, bulk solution electrical conductivity; µ, universal scaling exponent for conductivity.)