Adsorption, Transformation and Leaching of the Insecticide Pirimicarb in OrchardSoils

摘要

The risk of leaching of pirimicarb to groundwater after its use for insectcontrol in integrated fruit production had to be evaluated. The adsorption of pirimicarb onto loamy soils is moderate and its half-life at 15 C is around 53 days. With a model simulating uniform water flow and equilibrium adsorption, the concentration leaching to the upper groundwater was estimated to be 0.01 micrograms/L or less. In a leaching study with soil columns in the laboratory, a small fraction of the insecticide was leached quickly, whereas the main part of the concentration pattern moved much less than expected. (Copyright (c) 1993 SC-DLO).