The soil persistence and leaching of simazine were investigated under field conditions at Campinas, SP, Brazil in a loamy podzol redyellow soil planted with corn crop. Simazine was applied at the rate of 3,0kg/ha a.i. at preemergence of weeds and corn on january, 14 1992. Gas chromatography analysis of soil samples taken at five different depths (0-10cm, 10-20cm, 20-30cm, 30-40cm and 40-50cm), eight times after simazine application over the year showed that the highest herbicide concentration was found at the 0-10cm layer; simazine residues were not found below 40cm soil depth and persistence curve of the herbicide was accounted for a 3rd. grade regression. One year after the treatment simazine residues were found in the soil (0,08 mg/kg).
Residue; soil; herbicide; ecotoxicology