Fe, Al and Mn extractable compounds along depth of soils with different colour
1999
Jokova, M. | Teoharov, M. (N. Poushkarov Institute for soil Science and Agroecology, BG-1080 Sofia (Bulgaria))
Dithionite, oxalate, and pyrophosphate extractable forms of Fe, Al, and Mn are determined by the methods of Mehra-Jackson, Tamm, and Bascomb (index d, o, and p respectively) in differently coloured soils. The content of the amorphous from (Feo) is lower and of the crystalline one (Fed-Feo) is much higher. More than 85% of Fed has gradually crystallized. It is related to the red soil colour, as well as the ratio between the content of the clay fraction and iron extractable compaunds. Maximums of Alo along depth show B horizons and it is used for cambic horizons establishing in some profiles. The reduction state and development stages of the soils reflect the Mnd and Mno content.
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