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Microbial Activity in Soils Treated with Acephate and Monitor¹

ABSTRACT

A Hanford loamy sand, a Domino silt loam, and an Altamont clay loam were treated separately with three repeated applications (20 ppm) of the organophosphate insecticides, acephate (O,S-dimethyl acetylphosphoramidothioate) and Monitor (O,S-dimethyl phosphoramidothioate) over a 50-day time span. Population levels of actinomycetes, bacteria, and fungi were not substantially affected by the addition of either pesticide. Neither could a marked effect be shown upon ammonification, nitrification, sulfur oxidation, or respiration rates. Replica plating failed to isolate bacteria from soils that were adversely affected by either pesticide. It is concluded that neither acephate nor Monitor had any adverse effect upon soil microorganisms.

Key Words: organophosphates • insecticides • nitrification • ammonification • sulfur oxidation • soil respiration • replica plating

¹ Contribution from the Department of Soil Science and Agricultural Engineering, Univ. of California, Riverside 92502. This work was supported by a grant from Chevron Chemical Co., Richmond, Calif. 94804. The technical assistance of L. S. Morse in this study was appreciated.

² Associate Professor of Soil Microbiology and Staff Research Associate respectively.