Fig. 5. Measured and RZWQM-predicted acetochlor and terbuthylazine concentrations in the soil profile at 2.5 and 1.5 kg a.i. ha^–1 rate, respectively. Predictions were performed using a linear instantaneous equilibrium (I-E) partitioning model with measured amounts on the day of application as initial amounts and a two-site, equilibrium-kinetic (E-K) sorption model with optimized kinetic parameters.