Submitted to: Bouyoucos Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 7/5/1995
Publication Date: N/A
Technical Abstract: Geographical information systems (GIS) are able to store and manipulate vast amounts of spatial data and are ideally suited to the investigation of agriculture as a non-point source of agrichemicals in water. However to be effective, a GIS needs accurate databases (both in parameter magnitude and spatial resolution) for the key soil, climate, and management tattributes that affect agrichemical fate and transport. Collection of these databases is the most costly and time consuming step in applying GIS, and the quality of these databases is often the limiting factor in the success of GIS application to non-point source pollution. In recent years several new approaches have been developed and tested for inexpensive and rapid data collection of soil attributes thought important in determining agrichemical fate and transport. Such methods as non-contacting electromagnetic induction, ground penetrating radar, and close-range optical sensors have been used to determine distribution of soil organic carbon and the depth and distribution of textural discontinuities. An illustration is given as to how electromagnetic induction can be used to map the spatial distributions of soil organic carbon and atrazine sorption potential.