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Chloride Movement in Undisturbed Soil Columns¹

ABSTRACT

Chloride movement was studied in soil columns taken from three Kentucky alluvial soils—Karnak, Huntington, and Bruno. The soils ranged from silty clay loam to sandy loam in texture and from well structured to unstructured. Columns were taken by driving a 15-cm diameter heating duct into the soil to a depth of 30 cm and then digging out around the column to remove it. These columns were mounted on blocks of candle wax and leached under 1.5 cm of Hg tension. A 25-ml "slug" of KCl was applied to each column and followed by deionized water at a rate just slow enough to prevent ponding on the soil surface. The maximum effluent concentration of Cl appeared far ahead of 1 pore volume in both Huntington and Karnak soils, which have well-defined structure, and at 1 pore volume in the Bruno sl which is not structured. The results emphasize the channeling of water in soils with well-defined structure.

¹ Contribution from the Univ. of Kentucky, Lexington, KY 40546. Published with the approval of the director of the Kentucky Agric. Exp. Stn. as Journal Article 79–125.

² Assistant Professor, Dep. of Plant and Soil Science, Univ. of Tennessee, Jackson, and Professor, Univ. of Kentucky.

Received for publication November 8, 1979. Accepted for publication January 26, 1981.