Fig. 4. Measured and predicted extractable atrazine concentration versus time from the top 25 mm of surface soil (top figure) and the mulch residue (bottom figure). Two applications were made during 2000: spring and layby applications on Day 0 and Day 59 (7 April and 5 June, respectively). Simulations are based on best fit using the first-order decay model (Eq. [1]).

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