Weed management: a need for ecological approaches - Ecological Management of Agricultural Weeds - page 13

Figure 1.4 Atrazine concentrations during April through June 1991 in the White River at Hazelton,IN (a); the Illinois River at
Valley City,IL(a); the Platte River at Louisville,NE (a); the Missouri River at Hermann,MO (b); the Ohio River at Grand Chain,IL
(b); and the Mississippi River at Thebes,IL,Clinton,IA,and Baton Rouge,LA(c).The maximum contaminant level (MCL) set by
the US Environmental Protection Agency for atrazine in drinking water is 3 g L 1 .(After Goolsby,Coupe & Markovchick,1991.)