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Distribution of Sodium Hydrosulfite Extractable Managanese in Some Iowa Soil Profiles¹

ABSTRACT

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.

¹ Joint contribution of Soil Survey Investigations, Soil Conservation Service, USDA, and Department of Agronomy, Iowa State University. Journal Paper No. J-3786 of the Iowa Agr. and Home Econ. Exp. Sta., Ames. Project No. 1250.

² Soil Scientist, Soil Survey Investigations, Soil Conservation Service, USDA, and Research Associate and Professor of Soils, respectively, Agronomy Department, Iowa State University, Ames.

Received for publication February 28, 1961. Accepted for publication June 22, 1961.