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Movement and Persistence of DDT and Lindane in Soil Columns¹

ABSTRACT

Columns of four soils were used to determine the amount of downward movement and persistence of DDT and lindane. Water was added at total depths of 12.7 and 25.4 cm to separate 10-cm-diameter leaching columns. After leaching, the columns were sectioned in 3-cm layers. Lindane was leached to a greater extent with 25.4 cm than with 12.7 cm, and to a greater extent in a loamy sand soil than in a clay soil. DDT remained in the O- to-3-cm layer in all soils regardless of the amount of water applied.

Pesticide-amended soils subjected to wetting and drying cycles lost more lindane than DDT. In the treatment receiving 25.4 cm of water during the cycling process, 57% of the applied lindane was recovered as compared to 76% of the DDT.

Key Words: pesticides

¹ Contribution from the Northern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA, in co-operation with the Colorado Agr. Exp. Sta., Scientific Journal Series no. 1175. Presented before joint meeting, Div. S-2 and S-3 Soil Science Society of America, Aug. 25, 1966, at Stillwater, Okla.

² Research Soil Scientist and Chemist, respectively, USDA, Fort Collins, Colorado.

Received for publication March 13, 1967. Accepted for publication June 15, 1967.