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Published in Soil Sci Soc Am J 28:688-692 (1964)
© 1964 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Classification and Genesis of Some Solonetz (Sodic) Soils in Eastern Arkansas1

M. E. Horn, E. M. Rutledge, H. C. Dean and M. Lawson2

ABSTRACT

Medium-textured Solonetz soils, comprising an estimated 600,000 acres in Arkansas, are extensively developed in loess and backwater alluvial deposits of eastern Arkansas. Three general groups are recognized: (1) Soils of less than about 10 inches depth to a sodic horizon, (2) soils with acid upper horizons and moderate depth (about 24 inches) to a sodic horizon, and (3) soils with sodic horizons and acid sola. Laboratory analyses of Lafe and Foley soil profiles indicate that their sodic horizons contain high percentages of exchangeable Na (15 to 40% or more) and Mg (40 to 50% or more) with electrical conductivities ranging up to 5 mmho. per cm. These horizons are commonly characterized by prismatic or columnar structure. It appears that these soils are undergoing leaching and that soils of high exchangeable Na and solonetz morphology are probably the result of prior high Na content.

NOTES

1 Contribution from the Department of Agronomy, Arkansas Agr. Exp. Sta., Fayetteville, and SCS, USDA, Little Rock. Presented before Div. S-5, Soil Sci. Soc. Am., Cornell University, New York, Aug. 21, 1962. Approved for publication by the Director of Arkansas Agr. Exp. Sta.

2 Assistant Professor of Agronomy, former Research Assistant, University of Arkansas; and Soil Scientists, SCS, USDA, Little Rock, Ark.

Received for publication August 26, 1963. Accepted for publication June 17, 1964.






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