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Published in Soil Sci Soc Am J 36:573-576 (1972)
© 1972 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Characterization of the Oxidized and Reduced Zones in Flooded Soil1

W. H. Patrick, Jr. and R. D. Delaune2

ABSTRACT

The oxidized and reduced layers in flooded soil were characterized by vertical distribution of the oxidation-reduction (redox) potential and concentrations of manganous manganese, ferrous iron, sulfide, nitrate, and ammonium. Redox potential was measured with a special motor-driven assembly which advanced a platinum electrode at a rate of 2 mm/hour through the flooded soil profile. Vertical distribution of reduced forms of manganese, iron, and sulfur and of nitrate and ammonium was determined by freezing and slicing the flooded soil into segments 1 or 2 mm thick. The apparent thickness of the oxidized layer was different when evaluated by the distribution of the various components in the profile, with the sulfide profile indicating the thickest oxidized zone, the manganese profile indicating the thinnest oxidized zone, and the iron profile showing an intermediate thickness. The thickness of the oxidized layer increased with duration of flooding.

NOTES

Contribution from the Department of Agronomy, Louisiana State Univ., Baton Rouge, La. 70803. This study was supported in part by Environment Protection Agency Project 16050 FJR. Presented before Division S-2, Soil Sci. Soc. of Amer., New York, N.Y., Aug. 19, 1971.

2 Professor of Soils and Associate, respectively, Baton Rouge, Louisiana 70803.

Received for publication November 2, 1971. Accepted for publication March 20, 1972.






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