Fig. 3. Penetration resistance (PR) profiles in the three strips at different times for the three tillage systems in the deep soil: subsoil tillage (ST), minimum tillage (MT), and no-tillage (NT).
Fig. 3. Penetration resistance (PR) profiles in the three strips at different times for the three tillage systems in the deep soil: subsoil tillage (ST), minimum tillage (MT), and no-tillage (NT).