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Effect of Several Insecticides on Ammonification and Nitrification in Two Neutral Alluvial Soils¹

ABSTRACT

Columbia fine sandy loam and Yolo loam were incubated in the laboratory at 15% moisture and five rates (0, 0.0005%, 0.005%, 0.05%, and 0.5% active ingredient) of insecticide. The insecticides used were, DDT, aldrin, dieldrin, lindane, heptachlor, and chlordane. All insecticides were applied as wettable powder formulations. Ammonia and nitrate were determined after 15, 30, and 60 days of incubation.

In general, the results seem to indicate that rates of insecticide of 0.05% or greater will inhibit nitrification in some soils. DDT is the least toxic to the nitrifiers of the insecticides studied, while aldrin, dieldrin, and chlordane are the most toxic. Lindane and heptachlor occupy an intermediate toxicity. The significance of the results is discussed.

The rates of insecticide required to produce an effect on nitrification and ammonification are greatly in excess of common rates of application for the materials studied.

¹ Contribution from the Department of Soils, University of California, Davis, Calif. Presented before Div. IV, Soil Science Society of America, Dallas, Tex., Nov. 20, 1953.

² Lecturer in soils.

Received for publication December 3, 1953.