Biological and Chemical Studies on the Decline of Soil Insecticides1

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Abstract
Special studies were made with two different soils when aldrin, dieldrin and heptachlor (5 p.p.m.) were mixed with regular and autoclave soils with and without the addition of urea at 5 p.p.m. The rate of decline of aldrin, dieldrin and heptachlor was measured by total chlorine and bioassay methods. In addition, decline of aldrin and dieldrin was measured by the specific phenylazide method. In genera], the total chloride and bioassay methods showed a high initial recovery of the insecticides from the soil, followed by a rapid decline. The specific phenylazide method showed little insecticide change after 11 months. The decline of insecticides could not be associated with soil microorganisms or with the physical and chemical properties of the soil.

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