Fig. 3. Apparent electrical conductivity (ECa) classes and (a) clay content (0–15 cm), (b) total C (0–15 cm), (c) extractable P (0–15 cm) and (d) total and fine POM (0–15 cm). Bars followed by the same letter within ECa classes are not significantly different (p < 0.05). Error bars represent ± one standard error of the mean.