| Abstract: | Agricultural chemicals (herbicides, insecticides, other pesticides and fertilizers) in surface water may constitute a human health risk. Recent research on unregulated rivers in the midwestern USA documents that elevated concentrations of herbicides occur for 1-4 months following application in spring and early summer. In contrast, nitrate concentrations in unregulated rivers are elevated during the fall, winter and spring. Natural and anthropogenic variables of river drainage basins, such as soil permeability, the amount of agricultural chemicals applied or percentage of land planted in corn, affect agricultural chemical concentrations in rivers. Logistic regression (LGR) models are used to investigate relations between various drainage basin variables and the concentration of selected agricultural chemicals in rivers. The method is successful in contributing to the understanding of agricultural chemical concentration in rivers. Overall accuracies of the best LGR models, defined as the number of correct classifications divided by the number of attempted classifications, averaged about 66%. |
| Genre: | Article |
| ProdID: | 70018053 |
| Citation Author: | Battaglin, W. A. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 260 |
| Citation Issue: | 235 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | IAHS-AISH Publication |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 8 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Using GIS and logistic regression to estimate agricultural chemical concentrations in rivers of the midwestern USA; 1996; Article; Journal; IAHS-AISH Publication; Battaglin, W. A. |
| Citation Start Page: | 253 |
| Citation Volume: | |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Using GIS and logistic regression to estimate agricultural chemical concentrations in rivers of the midwestern USA; 1996; Article; Journal; IAHS-AISH Publication; Battaglin, W. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
| Publisher: | |
