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| DOI: | 10.2134/jeq1999.00472425002800010005x |
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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/28/1/JEQ0280010045
Last checked: 11/08/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Jaynes, D. B.;
Hatfield, J. L.;
Meek, D. W. |
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| Author Affiliation: | National Soil Tilth Lab., USDA-ARS, Ames, IA |
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| Title: | Water quality in Walnut Creek watershed: Herbicides and nitrate in surface waters |
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| Source: | Journal of Environmental Quality. Vol. 28, No. 1, January/February 1999, p. 45-59. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 15 |
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| Keywords: | TIC Keywords: Alachlor; Atrazine; Herbicide evaluation; Leaching; Metolachlor; Metribuzin; Nitrogen fertilization; Surface water; Water quality; Watersheds
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| Facility Names: | Walnut Creek Watershed, in City of Clive, Iowa |
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| Abstract/Contents: | "There is a lack of quantitative information describing the impact of farming on water quality at the watershed scale. This study documents the surface water quality of Walnut Creek - a 5130-ha watershed with about 86% of the land used for crop production. Starting in 1990, flow and concentrations of NO3-N and four herbicides - atrazine [6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine- alachlor [2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)ace metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin- and metolachlor [2-chloro-N-(2-ethyl-6-methylphenyl) - N - (2 -methoxy -1-methylethyl)acetamide] - were measured at eight locations. Nitrate-N concentrations often exceeded 10 mg L-1 during May, June, and July. Total losses from the watershed ranged from 4 to 66 kg ha-1 yr-1 and represented 6 to 115% of the N applied as fertilizer in any year. Atrazine and metolachlor were detected at concentrations >0.2 μg L-1 in about half of all water samples, while alachlor and metribuzin were seldom detected. Median concentrations for atrazine and metolachlor were below 1 μg L-1 for all locations within the watershed. During runoff events, herbicide concentrations in the stream increased while NO3-N concentrations decreased. Yearly losses from the watershed ranged from 0.2 to 7.5 g ha-1 for atrazine and from 03 to 6.7 g ha-1 for metolachlor. These losses represent 0.18 to 5.6% of the atrazine and 0.047 to 1.6% of the metolachlor applied in any year." |
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| Language: | English |
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| References: | 47 |
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| Note: | Map
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Jaynes, D. B., J. L. Hatfield, and D. W. Meek. 1999. Water quality in Walnut Creek watershed: Herbicides and nitrate in surface waters. J. Environ. Qual. 28(1):p. 45-59. |
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| DOI: 10.2134/jeq1999.00472425002800010005x |
| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/28/1/JEQ0280010045
Last checked: 11/08/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: b2225072a |
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