**4. Results and discussion**

Sorption-desorption processes have a significant effect on pesticide persistence, pesticide concentration level in the soil solution and on the transport of pesticides from agricultural field to other environmental compartments (Arias-Estevez et al., 2008). An understanding of the variability of pesticide persistence and sorption-desorption processes within and among regions can improve the accuracy of estimates of the behavior and fate of pesticide in the soil and provide an additional support in design of intervention strategies against groundwater pollution.
