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This article in JEQ

  1. Vol. 3 No. 4, p. 327-328
     
    Published: Oct, 1974


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doi:10.2134/jeq1974.00472425000300040006x

Microbial Activity in Soils Treated with Acephate and Monitor1

  1. D. D. Focht and
  2. H. Joseph2

Abstract

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.

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