| Abstract: | Differences in nitrate-N concentrations in,around water in Kansas can be explained by variations in agricultural practices and vadose-zone stratigraphy. In northwestern Kansas, past use of a local stream for tailwater runoff from irrigation and high fertilizer applications for sugar-beet farming resulted in high nitrate-N concentrations (12-60 mg L-1; in both soil and ground water. Nitrogen isotope values from the soil and ground water range from +4 to +8? which is typical for a fertilizer source. In parts of south-central Kansas, the use of crop rotation and the presence of both continuous fine-textured layers and a reducing ground-water chemistry resulted in ground-water nitrate-N values of < 3 mg L-1. The effects of denitrification in the vadose zone and ground water are indicated by enriched ?? 15N values of +10 to +15?. At a site study, irrigated continuous corn was grown on sandy soils with discontinuous fine-textured layers. Here, nitrate-N concentrations were often > 10 mg L-1; in both soil and grounwater. Nitrogen isotope values of +3 to +7? indicate a fertilizer source. Crop rotation decreased nitrate-N values in the shallow ground water (9 m). However, deeper ground water showed increasing nitrate-N concentrations as a result of past farming practices. |
| Genre: | Conference Paper |
| ProdID: | 70019018 |
| Citation Author: | Townsend, M. A.; Sleezer, R. O.; Macko, S. A. |
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| Citation Editor: | Straskraba M. |
| Citation End Page: | 226 |
| Citation Issue: | 4-5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Water Science and Technology |
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| Citation Number Of Pages: | 8 |
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| Citation Publisher: | Pergamon Press Inc |
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| Citation Search Results Text: | Effects of agricultural practices and vadose zone stratigraphy on nitrate concentration in ground water in Kansas, USA; 1996; Conference Paper; Water Science and Technology; Townsend, M. A.; Sleezer, R. O.; Macko, S. A. |
| Citation Start Page: | 219 |
| Citation Volume: | 33 |
| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Effects of agricultural practices and vadose zone stratigraphy on nitrate concentration in ground water in Kansas, USA; 1996; Conference Paper; Water Science and Technology; Townsend, M. A.; Sleezer, R. O.; Macko, S. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0273-1223(96)00234-X |
| Date Other: | Mon, 1 Jan 1996 00:00 -0600 |
| Publisher: | Pergamon Press Inc |
