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Chlorinated Insecticides in Runoff Water as Affected by Crop Rotation¹

ABSTRACT

The concentration and amounts of three chlorinated insecticides were lower in runoff from a rotation system of potato (Solanum tuberosum L.), oats (Avena sativa L.), and sod, than under continuous potato cropping. Runoff samples from natural runoff plots were collected following each storm, and the amounts of DDT, endrin, and endosulfan were analyzed with a gas chromatograph.

The amounts of pesticides in runoff were small compared to the amount applied. The concentrations of the insecticides in the runoff (soil-water suspension) were generally greater than those found in the settled soil (sludge).

¹ Contribution from the Soil & Water Conserv. Res. Div., ARS, USDA, the Maine Agr. Exp. Sta., Dep. of Plant & Soil Sciences, and the Water Resource Center, University of Maine, Orono. This project is supported in part by funds provided by the U. S. Dep. of Interior as authorized under the Water Resources Research Act of 1964, Public Law 88–379.

² Soil Scientists. The authors wish to express their appreciation to Mrs. F. C. Wittner for analytical assistance during this investigation.

Received for publication November 1, 1967. Accepted for publication February 3, 1968.