Fig. 1. Bulk density of seven Bucks soil samples from the 0.76- to 1.22-m depth plotted as a function of the applied stress. The legend indicates the initial water content (kg kg^–1) for each soil sample. Symbols represent experimental data. The smooth lines are nonlinear regression curves based on Eq. [1] best fit separately (see Table 1 for values of the input data and coefficients) to each individual soil sample.