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Fig. 2. Yearly, flow-weighted, average concentrations of alachlor, atrazine, linuron, and metribuzin in runoff from the chisel-tilled, no-till, and reduced-input watersheds. Since alachlor was applied in corn and soybean crop years, there are two averages for each year for this herbicide, but only one average per year for the others. HAL is health advisory level, MCL is maximum contaminant level.