Water Quality in the Western Lake Michigan Drainages, Wisconsin and Michigan, 1992-95
More than 96 percent of the total anthropogenic phosphorus input to the study area is in the form of commercial fertilizers and livestock manures. Point sources such as sewage-treatment plants contribute only about 1.2 percent of the total input (Robertson, 1996a).
Return to Fertilizers and Livestock Wastes Increase Nutrients in Streams and Ground Water