Fig. 3. Influence of incubation time and effluent on ratio of solution concentration to soil concentration (nonequilibrium K_d). Initial imazaquin–soil concentration was 17.8 µmol kg^–1. Flow rate for all treatments was 1.0 mL min^–1. The terms ^a and ^b denote initial event slopes that are different at the 0.05 level of significance; y and z denote second event slopes that are different at the 0.05 level of significance.