| Abstract: | Total nitrogen input and loss from cattle manure, fertilizer, legume crops, precipitation, and domestic septic systems in the upper Snake River Basin, Idaho and western Wyoming, were estimated by county for water year 1990. Domestic septic systems account for less than 1 percent of the total nitrogen input in the basin; precipitation accounts for 6 percent. The remaining 93 percent is produced by cattle manure (29 percent), fertilizer (45 percent), and legume crops (19 percent). Residual total nitrogen was estimated by subtracting loss due to cattle manure storage ad application, crop uptake, and decomposition of the previous year‘s nonleguminous crop residue (chaff) from all nitrogen input in the basin. Most counties had positive mean values of residual total nitrogen, suggesting nitrogen is available for runoff to surface water or leaching to ground water. A mass balance of total nitrogen input and loss in Gooding, Jerome, Lincoln, and Twin Falls Counties suggests that more than 6,000,000 kg (6,600 tons) of total nitrogen is input in this four-county area than is discharged by the Snake River. This excess nitrogen probably is utilized by aquatic vegetation in the Snake River (causing eutrophication), stored in soil and ground water, and lost through dentrification. |
| Genre: | USGS Numbered Series |
| ProdID: | 29472 |
| Citation Author: | Rupert, Michael |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vi, 15 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 96-4008 |
| Citation Search Results Text: | Major sources of nitrogen input and loss in the upper Snake River basin, Idaho and western Wyoming, 1990; 1996; WRI; 96-4008; Rupert, Michael |
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| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Major sources of nitrogen input and loss in the upper Snake River basin, Idaho and western Wyoming, 1990; 1996; WRI; 96-4008; Rupert, Michael |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1996/4008/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1996/4008/report.pdf |
| Date Other: | Sun, 1 Dec 1996 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
Earth Science Information Center, Open-File Reports Section [distributor], |
