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Published in Soil Sci Soc Am J 35:43-46 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Potassium Salts on Extractable Soil Manganese1

D. T. Westermann, T. L. Jackson and D. P. Moore2

ABSTRACT

Incubation experiments with an acid, poorly drained soil (Typic Albaqualf) showed that the level of extractable Mn was increased by salt treatments. The relative order of the salt effect was KBr > KCl > KNO3 > K2SO4. Soil pH changes accounted for the majority of the KNO3 and K2SO4 treatment effects, but the KCl and KBr effects could not be explained on this basis. In addition, ionic strength considerations and differential biological activities were not found to be factors influencing the K salt effects in the soil system. A hypothesis is presented to explain the KCl or KBr effect, in which the anion would function in an oxidation-reduction reaction. This hypothesis is supported by the fact that the soil treated with KBr contained more extractable Mn than that treated with KCl, in accordance with theory. Theoretical calculations also suggested the possibility that both Cl- and Br- could reduce the lower valency Mn oxides under the experimental soil conditions.

NOTES

1 Contribution from the Dept. of Soils, Oregon State Univ., Corvallis, Ore. 97331. Published with approval of the Director, Oregon Agr. Exp. Sta., Corvallis, as Technical Paper no. 2714.

2 Assistant-in-Soils (now Research Soil Scientist, Northwest Branch, Soil & Water Conserv. Res. Div., ARS, USDA, at Snake River Conserv. Res. Center, Kimberly, Ida. 83341), Professor of Soils, and Associate Professor of Soils, Oregon State Univ., Corvallis, respectively.

Received for publication July 10, 1970. Accepted for publication October 21, 1970.






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