Fig. 3. Air and water distribution in undisturbed and remolded soil at –1-m water potential in (A) Ustolls and (B) Usterts of central South Dakota (USA). Undisturbed-remolded x management interactions were not significant (P 0.05). In the top right corner, probability of differences between undisturbed and remolded sample means are reported for air-filled pore volume (AIR = pores of >0.030-mm diam.) and water-filled pore volume (WATER = pores of <0.030-mm diam.). Standard errors for air and water were 0.016 and 0.011, respectively, in Ustolls (N = 18). Standard errors for air and water were 0.036 and 0.021, respectively, in Usterts (N = 6).