Watershed Vulnerability To Herbicide Transport in Northern Missouri and Southern Iowa Streams ... There are many factors affecting herbicide transport to streams, and they can be organized into four general categories: (1) intrinsic factors − soil and hydrologic properties and geomorphologic characteristics of the watershed; (2) anthropogenic factors − land-use and herbicide management; (3) climate factors − particularly precipitation and temperature; and (4) herbicide factors − chemical and physical properties and formulation (1−4). ... This information would contribute to a more detailed understanding of which areas transport the greatest herbicide load to the large river systems, and it will provide a basis for prioritizing implementation [...]