Abstract
The large utilization of pesticides in modern agriculture can seriously interfere with the biological processes taking place in soils. This paper studied the effects of two herbicides, trifluralin and acifluorfen, on the respiration and on the size of microbial biomass in a soil under permanent pasture. The herbicides were added to the soil at the usual rate utilized in the field, and at a tenfold higher rate. Acifluorfen did not seem to affect soil microflora, while trifluralin showed a marked toxic effect on both the respiration and the size of microbial biomass. The toxic effect of trifluralin seems to continue after the end of the incubation period (5 weeks) at both utilized doses.
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