Lows, L. E. 1980. Humus fraction ratios as a means of discriminating between horizon types. Can. J. Soil Sci. 60: 219-229.Humus fraction distribution in a wide range of horizon samples was examined by measuring carbon content in humic acid (C1), in fulvic acid (C) and in the strongly colored polyphenolic component of the fulvic acid fraction (Cn). Fraction distribution was described by the ratios C6/C1 and C"/Ci. It was concluded that humus fraction ratios were related to horizon types as used in the Canadian System ofSoil Classification, and were effective in discriminating between certain horizon types, particularly between Luvisolic Bt and Podzolic Bf. The
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