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The study examined the influence of land-use (cropping patterns) and integrated agricultural best management practices (BMPs) on spring herbicide levels in an agricultural watershed. Atrazine and metolachlor were applied for weed control during spring of 1998–2002, 2005, and 2007–2013. Watershed-wide mass of applied herbicides ranged from 12.7 to 209.2 g atrazine and 10.9–302.2 g metolachlor with...
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