FIGURE 3-2 (top) N fertilization rates and stream concentrations of nitrate. (bottom) Atrazine application rates and stream concentrations of atrazine.

FIGURE SOURCE: J.Ward, U.S. Geological Survey, personal commun., July 12, 2007. DATA SOURCES: stream N, Mueller and Spahr (2007); N inputs, Ruddy et al. (2006); stream atrazine and atrazine inputs, Gilliom et al. (2006).

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