Fig. 8. Three different approximations of the r_s factor for Hallaire's (1984) aggregated clay soil as functions of water content. The r_s^' values (diamonds) of the r_s factor for the soil sample or layer in Bronswijk's approximation; the r_sM values (squares) of the r_s factor corrected in part for the soil layer; and the totally corrected r_s factor values (circles) for the soil layer.