Distribution of Sodium Hydrosulfite Extractable Managanese in Some Iowa Soil Profiles1
- R. B. Daniels,
- J. F. Brasfield and
- F. F. Riecken2
Manganese, extractable by sodium hydrosulfite and referred to simply as free Mn in this paper, was determined for 21 Iowa soil profiles. The soil profiles studied included Wiesenbodens, Planosols, Gray-Brown Podzolic soils, and Brunizems.
Brunizems, in general, have either little change in free Mn with depth or a slight decrease in the most acid part of the solum. Free Mn in Gray-Brown Podzolic soils and forest Planosols is at a maximum in the A2 horizon and at a minimum in the B2 horizon. In prairie Planosols, by contrast, minimum values for free Mn occur in the A2 horizons, and maximum or near maximum values occur in the B2-B3 horizons. Free Mn in Wiesenbodens increases from the A1 to the B2 horizon.
The distribution of free Mn in Brunizems apparently is a function of pH of the solum, whereas in the prairie Planosols and Wiesenbodens reducing conditions and/or pH may be controlling factors. The distribution of free Mn in Gray-Brown Podzolic soils and forest Planosols may be due in part to pH and reducing conditions, and in part to factors that cannot be determined by data available.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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