Fig. 7. Scatter function obtained in saturated Millville silt loam at two different salinity levels using a 3-cm long three-wire probe. Resonant frequency analysis (RFA) of the 48 dS m^–1 scatter function using the intersection of two lines drawn through the rising portion of the scatter function data in the first trough yields a permittivity, _x, of 30.2 following Eq. [10]. This is comparable with the static permittivity (_s = 29.9) obtained from fitting the Debye (1929) model to this data.