Fig. 5 Boron adsorption on soil samples: (a) Altamont soil, ; (b) Altamont subsoil, ; (c) Arlington soil, ; (d) Arlington subsoil, ; (e) Bonsall soil, ; (f) Bonsall subsoil, ; (g) Fallbrook soil, ; (h) Fallbrook subsoil, ; (i) Imperial soil, ; (j) Imperial subsoil, ; (k) Pachappa soil, ; (l) Pachappa subsoil, ; (m) Ramona soil, ; (n) Ramona subsoil, . Squares represent experimental data. Model fits are represented by solid lines. Model predictions are represented by dashed lines. Suspension density = 200 g L^-1; initial B concentration = 0.463 mM