Stream Yields from Agricultural Chemicals and Feedlot Runoff from an Illinois Watershed

摘要

For all flood events during 1987 and 1988, the study determined the amounts of pesticides and nutrients transported from a 62,000 acre watershed. Primary sources of nutrients and pesticides were rowcrops (49% of watershed acres) and animal feedlots. Corn is grown on over 70 percent of rowcrop acreage. The majority of the 60,000 livestock animals are located in the 15 total confinement sites of the 93 feedlots in the watershed. The Court Creek watershed is located east of Galesburg in western Illinois. Topography of the watershed is similar to much of the Illinois River basin. Elevations drop from 840 ft above mean sea level (msl) on the relatively flat prairie near Galesburg to 580 msl at the mouth of Court Creek at Dahinda.