| Abstract: | In the Suwannee River basin of northern Florida, nitrate-N concentrations are 1.5 to 20 mg 1-1 in waters of the karstic Upper Floridan aquifer and in springs that discharge into the middle reach of the Suwannee River. During 1996-1997, fertilizers and animal wastes from farming operations in Suwannee County contributed approximately 49% and 45% of the total N input, respectively. Values of ??15N-NO3 in spring waters range from 3.9??? to 5.8???, indicating that nitrate most likely originates from a mixture of inorganic (fertilizers) and organic (animal waste) sources. In Lafayette County, animal wastes from farming operations and fertilizers contributed approximately 53% and 39% of the total N input, respectively, but groundwater near dairy and poultry farms has ??15N-NO3 values of 11.0-12.1???, indicative of an organic source of nitrate. Spring waters that discharge to the Suwannee River from Lafayette County have ??15N-NO3 values of 5.4-8.39???, which are indicative of both organic and inorganic sources. Based on analyses of CFCs, the mean residence time of shallow groundwater and spring water ranges between 8-12 years and 12-25 years, respectively. |
| Genre: | Article |
| ProdID: | 70021045 |
| Citation Author: | Katz, B. G.; Hornsby, H. D.; Bohlke, J. F. |
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| Citation End Page: | 124 |
| Citation Issue: | 257 |
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| Citation Language: | English |
| Citation Larger Work Title: | IAHS-AISH Publication |
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| Citation Number Of Pages: | 8 |
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| Citation Publisher: | Gulf Publications |
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| Citation Search Results Text: | Sources of nitrate in water from springs and the Upper Floridan aquifer, Suwannee River basin, Florida; 1999; Article; Journal; IAHS-AISH Publication; Katz, B. G.; Hornsby, H. D.; Bohlke, J. F. |
| Citation Start Page: | 117 |
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| Citation Year: | 1999 |
| Type: | citation/reference |
| Text: | Sources of nitrate in water from springs and the Upper Floridan aquifer, Suwannee River basin, Florida; 1999; Article; Journal; IAHS-AISH Publication; Katz, B. G.; Hornsby, H. D.; Bohlke, J. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Fri, 1 Jan 1999 00:00 -0600 |
| Publisher: | Gulf Publications |
