Fig. 4. Effective porosity,_C0, calculated using the minimum equivalent pore radius (C₀) for a given tension range (Eq. [8], dark points) and effective porosity, , computed from the representative mean pore radius for two consecutive soil water tensions, , (Eq. [11], white points) measured under conventional tillage (CT), reduced tillage (RT), and no-tillage (NT). Macropores are defined as those pores that drain at > –4 cm and mesopores as those pores draining at between –4 and –14 cm. Asterisks indicate significant difference between _C0 and (P < 0.05, t-test).