Fig. 3. Summarizing comparison of the sequentially extracted fractions of Zn in acidic soils (open boxes) and neutral soils (hatched boxes). Boxes cover the 25th to 75th percentile range (including the median [lines dividing boxes] and the arithmetic mean [squares]), bars cover the 5th to 95th percentile range, and crosses indicate the maximum and minimum values. The hypothetical interpretation of the extracted fractions is provided in Table 1.