Fig. 7. Relationship between the mean pesticide concentrations in free-draining lysimeters (35 cm soil depth) and the Groundwater Ubiquity Score (GUS = log(t_0.5)[4 - log(K_OC)]), according to Gustafson (1989) (AC, alachlor; AZ, atrazine; CF, chlorpyrifos; ES, endosulfan ; MC, metolachlor; MF, monocrotofos; SZ, simazine; TN, trifluralin); p < 0.05 for both regressions.

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