MOVIMENTO DO HERBICIDA IMAZETAPIR EM UM NEOSSOLO QUARTZARêNICO TíPICO E EM UM LATSSOLO DE TEXTURA MéDIA DAS NASCENTES DO RIO ARAGUAIA, MUNICíPIO DE MINEIROS (GO)

摘要

The movement of the herbicide imazetaphyr was analysed in Typic Quartzipsamment and Quartzipsammentic Haplortox soils, under soy cultivation, of the recharge areas of the Guarani aquifer in the regions of Araguaia river source in Goias and Mato Grosso so Sul - Brazil, being main factors in this movement the hydraulic conductivity (K), organic carbon content (OC) and clay content (CC). The factors total pororsity (n t ), microposrosity (n mi ), macroporosity (n ma ) ,soil density (Ds) and field capacity (FC) corroborate with the hydraulic conductivity. The experiment was developed in columns soils whit preserved structure, with application of the commercial product (Pivot) containing the herbicide in discussion. These parameters show likely influence on the vertical movement of the imazetaphir herbicide connected to its anionic condition, mainly in pH between 5 and 8, typical of the soils in question. Were observed, for example, a significant difference between K values of the two soils, being higher to Typic Quartzipsamment, besides an inverse relation between carbon content (OC) and clay content (CC) values and hydraulic conductivity (K) values of the two soils, showing to be inhibitors parameters in the movement of the imazetaphir in soil profile, mainly by hydrogen bonds and hydrophobic interactions by organic matter. The results obtained in this work aim to subside assessment environmental risks, over all groundwater, considering aquifers recharge areas, naturally fragile, whit emphasis to the Guarani aquifer.