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Fig. 8. Change in cone index at different depths after rain (108 mm) on 14 Dec. 1999 (CETAPAR experimental field). Error bars: SD (n = 5). The dotted line indicates a cone index of 1.27 MPa, which was found to restrict soybean taproot growth (Sato et al., 2001). *greater than 1.27 MPa at P = 0.05. **greater than 1.27 MPa at P = 0.01.