Toxic Substances Hydrology Program
Management Practices a Factor in Herbicide Declines
Data collected from over 50 Midwestern streams in 1989, 1990, 1994, 1995, and 1998 indicate that there has been some decline of the high herbicide concentrations observed in Midwestern streams during the spring planting season.
Battaglin, W.A., and Goolsby, D.A., 1999, Are shifts in herbicide use reflected in concentration changes in Midwestern Rivers?: Environmental Science and Technology, v. 33, p. 2917-2925.
Scribner, E.A., Battaglin, W.A., Goolsby, D.A., and Thurman, E.M., 1999, Changes in herbicide concentrations in Midwestern streams in relation to changes in use, 1989-98, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999--Volume 2 of 3--Contamination of Hydrologic Systems and Related Ecosystems: U.S. Geological Survey Water-Resources Investigations Report 99-4018B, p. 313-322.