The movement of the tebuthiuron herbicide was analyzed in two representative soils - Quatzipsammentic Haplorthox, Typic Quartzipsamment, of the recharge areas of the Guarani aquifer in Brazil. The main factors in this movement are hydraulic conductivity (K), organic carbon content (OC) and clay content (CT). The experiment was carriel out in columns (type lisimeters) with application of the commercial product. These parameters showed great influence on the vertical movement of the tebuthiuron herbicide, specially in the Typic Quartzipsamment soil. The high (K) values in this soil have a direct relationship with tebuthiuron collected in water percolated by columns. Inverse relationship between carbon content (OC) and clay content (CT) with hydraulic conductivity (K) was observed. The results obtained aim to subside assessment of environmental risks, mainly groundwater from aquifer recharge areas naturally fragile, with emphasis for the Guarani aquifer.
Quatzipsammentic Haplorthox; Typic Quartzipsamment; hydraulic conductivity; groundwater
