Unsaturated hydraulic conductivity relations for topsoil and subsoil in 12 Danish till soils were obtained from measurements by the hot air method. In the range of pressure potentials (pF-values from 1.7 to 3.0) within which the method is most suitable the hydraulic conductivities were found to be within the range of 10-10-10-7 m s-1 for topsoils and 10-11-10-8 m s-1 for subsoils. The hydraulic conductivity relations obtained were briefly discussed in relation to the corresponding pF-curves. At any pF-value the subsoils differed more than the topsoils in hydraulic conductivity.
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