Distribution of Sodium Hydrosulfite Extractable Managanese in Some Iowa Soil Profiles
1962
Daniels, R. B. | Brasfield, J. F. | Riecken, F. F.
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.
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