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Fig. 3. Depth plots showing pedogenic silica content (shaded regions) in the studied pedons. The numerical value in each plot indicates the depth-weighted average of secondary silica. The silica content was integrated to a depth of 20 cm into the C or Cox horizon for each pedon (Table 1). The Fed (citrate-bicarbonate-dithionite-extractable Fe; solid lines) and percentage of clay (dotted lines) are plotted for comparison (data from Kendrick and McFadden, 1996).
