This study had the aim to evaluate sulfentrazone degradation in two soils (distroferric red Latossol and orthic quartzarenic Neosol) used for sugarcane production in Mato Grosso do Sul State and also to evaluate the influence of temperature, moisture and soil depth in the sulfentrazone degradation rates. Experiments were carried out using incubated soils at different soil moistures (50 and 80% field capacity - FC), temperatures (30 and 40 ºC) and depths (0-30 and 50-70 cm). Remaining sulfentrazone concentrations in soil as a function of time were adjusted to single first-order kinetics model (SFO) and also to the first-order multi-compartment kinetic model (FOMC). Sulfentrazone was less persistent in conditions of high soil moisture (80% FC), high temperature (40 ºC) and in the topsoil (0-30 cm depth). Sulfentrazone degradation was best described by FOMC model. Half-life values of sulfentrazone evaluated at different conditions of moisture, temperature and soil depths ranged from 34 to 116 days.
half-life; persistence; sugarcane; pesticides
