Fig. 2. Atrazine dissipation in Colorado (CO) and Mississippi (MS) s-triazine–adapted and non-s-triazine–adapted soil as a function of incubation temperature (10 or 40°C) and soil moisture content (40 and 70% field capacity). Symbols represent the mean of three replications for each of the following treatments: 10°C at 40% field capacity (closed circles), 10°C at 70% field capacity (open circles), 20°C at 40% field capacity (closed inverted triangles), and 20°C at 70% field capacity (triangles). Lines represent the best fit of the first-order kinetics model: C_t = C_oe^–kt. Error bars indicate 1 SD and do not appear when smaller than the symbol for the mean.