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The use of Eqn 1 (Gao et al., 2016) to predict penetrometer resistance profiles for various soil density–depth scenarios in well‐watered soil. These predictions are consistent with data shown in Fig. 2 as well as published data showing increases in penetrometer resistance to values greater than 4 MPa at depths as shallow as 50 cm (e.g. Van Hussteen, 1983; Raper et al., 1999; Tekeste et al., 2008; Chen & Weil, 2009).
