Effects of earthworm Pontoscolex corethrurus on distribution of acaricida dicofol in a Podzolic soil

Abstract

The aim of this work was to study the influence of earthworm on pesticides distribution in a Podzolic soil. The experimental model used was a microcosm filled with sieved soil to a final density of 1.25 g cm-3. In microcosms with or without Pontoscolex corethurus 14C-dicofol was applied, and after a period of 52 days strong rain simulation was performed. In the layer of 0-1 cm 75% of the radioactivity in the soil without earthworms were recovered, and in the soil with earthworms the recovery was 9% inferior. In the deepest layers the values of the radioactivity were below 20% and the differences among the treatments did not surpass 2%. This earthworm species of large occurrence in Brazil showed no important influence on the distribution of the pesticide in soil.