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Table 19.8--Agricultural land-use practices and associated pollutants

Agricultural land-use practices	Pollutants (Causes)
Nonirrigated cropland	Sedimentation, nutrients, pesticides, streambank destabilization, removal of riparian vegetation
Irrigated crop production	Sedimentation, nutrients, pesticides, traces of certain metals, salts, bacteria, viruses.
Rangeland	Bacteria, nutrients, sedimentation, pesticides, streambank destabilization, flow alteration, removal of riparian vegetation, increases in water temperature, reductions in dissolved oxygen concentrations.
Pasture land	Bacteria, nutrients, sedimentation, pesticides, streambank destabilization, flow alteration, removal of riparian vegetation, increases in water temperature, reductions in dissolved oxygen concentrations.
Feedlots	Bacteria, viruses, nutrients, sedimentation, organic material, salts and metals.
Animal holding areas	Bacteria, viruses, nutrients, sedimentation, organic material, salts and metals.
Animal operations	Bacteria, viruses, nutrients, sedimentation, organic material, salts and metals.

Source: U.S. Environmental Protection Agency 1998a; Novotny 1994