Fig. 2. Persistence of acetochlor in Horotiu sandy loam soil at an application rate of 2.5 kg a.i. ha^–1: Measured and fitted by first-order kinetics (Model 1), quadratic model (Model 2), first-order double-exponential model (Model 3), first-order biphasic model (Model 4), and two-compartment model (Model 5).