Luzzi, Johana I. ， Aparicio, Virginia C. ， Ledda, Alejandra ， Veronica, Sauer ， Costa, Jose L.
2025-09-02 JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES 2025 60(卷), 9(期), (421-432页)
Agricultural activity can contaminate natural resources, such as soil, surface water and groundwater, depending on the interaction between herbicides and soil physicochemical properties that govern retention and transport within the soil profile. This study evaluates the adsorption, desorption and vertical transport of atrazine in Haplustoll soils under two management systems: continuous soybean monoculture (T1) and intensified rotations with grasses and oilseeds (T2) in southwestern Chaco, Argentina. Results show moderate atrazine retention, dependent on the applied concentration, with no significant differences between treatments. Desorption exhibited positive hysteresis, indicating slow herbicide release in successive stages. However, preferential flow through macropores dominated atrazine transport in both systems, evidencing low retention in the soil profile, with high recovery in leachates. Atrazine displayed a high leaching potential in both systems, particularly in soils with low organic carbon content.