Extractable compounds of Fe, Al, and Mn as participants and indicators of soil processes
1999
Dzhokova, M. (Institut po Pochvoznanie i Agroekologiya "N. Pushkarov", Sofia (Bulgaria))
The distribution of the studied extractable forms of Fe, Al, and Mn free compounds can be used as criteria for different soil processes. It is due to the differences in their chemical character, since the metallic character decreases in the range: Mn Fe Al. The depth functions of the dithionite extractable, as well as the depth functions of Al and Mn forms of Al and Mn could be used as criteria for establishment of parent material discontinuity. Probably the higher content of Mn in upland aerated soils contributes to the increase in the ratio between humic and reductive fulvic acids (Ch/Cf), due to its higher oxidative power.
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