This experiment was conducted in order to verify a possible translocation of substituted urea herbicides in soil. Bioassay was done using tomato as plant. The soil tested was from a carrot culture with high organic matter and clay content. The herbicides tested were linuron, chloroxuron and chlorobromuron, at two dosages: minimum and maximum recommended by industries. The results indicated that there was not neither lateral' translocation nor through 30 cm depth. The possible cause was the high clay and organic matter content of the soil.