Fig. 2. Measured and simulated atrazine concentration versus time in the top 25 mm of Commerce soil for the no-mulch treatment (top figure) and the no-till (mulch not removed) treatment (bottom figure). Two atrazine applications were made during 1999: spring application on Day 0 (26 March) and layby (preemergence) on Day 73 (7 June). Simulations are based on best fit using the first-order decay model (Eq. [1]).

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