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Fig. 3. Agricultural and nonagricultural use of the seven herbicides of interest. Estimates of nationwide rates of agricultural use per year are from 1991 to 1995 (Gianessi and Anderson, 1996); estimates for rates of nonagricultural use per year are from 1987 to 1990 (Gianessi and Puffer, 1990). Information on application settings was obtained from Gianessi and Puffer (1990) for agricultural use, and from a variety of sources for nonagricultural use. a.i., active ingredient.
