Fig. 7. Water infiltration rate during 3-h simulated rainstorms on three consecutive days on the Williams loam (Exp. 2). Tillage treatments were: (i) subsoiling with parabolic subsoiling shanks and secondary tillage with sweeps (SSplus), (ii) subsoiling with parabolic subsoiling shanks (SS), and (iii) not subsoiled (NoSS). Least significant differences are shown at 0.5-h intervals where P 0.05.