| Soil nitrogen balance under wastewater management: field measurements and simulation results. | |
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MedLine Citation:
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PMID: 19398527 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The use of treated wastewater for irrigation of crops could result in high nitrate-nitrogen (NO(3)-N) concentrations in the vadose zone and ground water. The goal of this 2-yr field-monitoring study in the deep silty clay loam soils south of Dodge City, Kansas, was to assess how and under what circumstances N from the secondary-treated, wastewater-irrigated corn reached the deep (20-45 m) water table of the underlying High Plains aquifer and what could be done to minimize this problem. We collected 15.2-m-deep soil cores for characterization of physical and chemical properties; installed neutron probe access tubes to measure soil-water content and suction lysimeters to sample soil water periodically; sampled monitoring, irrigation, and domestic wells in the area; and obtained climatic, crop, irrigation, and N application rate records for two wastewater-irrigated study sites. These data and additional information were used to run the Root Zone Water Quality Model to identify key parameters and processes that influence N losses in the study area. We demonstrated that NO(3)-N transport processes result in significant accumulations of N in the vadose zone and that NO(3)-N in the underlying ground water is increasing with time. Root Zone Water Quality Model simulations for two wastewater-irrigated study sites indicated that reducing levels of corn N fertilization by more than half to 170 kg ha(-1) substantially increases N-use efficiency and achieves near-maximum crop yield. Combining such measures with a crop rotation that includes alfalfa should further reduce the accumulation and downward movement of NO(3)-N in the soil profile. |
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Authors:
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Marios Sophocleous; Margaret A Townsend; Fred Vocasek; Liwang Ma; Ashok Kc |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-04-27 |
Journal Detail:
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Title: Journal of environmental quality Volume: 38 ISSN: 0047-2425 ISO Abbreviation: J. Environ. Qual. Publication Date: 2009 May-Jun |
Date Detail:
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Created Date: 2009-04-28 Completed Date: 2009-06-18 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0330666 Medline TA: J Environ Qual Country: United States |
Other Details:
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Languages: eng Pagination: 1286-301 Citation Subset: IM |
Affiliation:
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Kansas Geological Survey, University of Kansas, 1930 Constant Ave., Lawrence, KS 66047, USA. marios@kgs.ku.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Agriculture Computer Simulation Models, Chemical* Nitrogen / analysis* Sewage Soil / analysis* Waste Management* Water Pollutants, Chemical / analysis* |
| Chemical | |
Reg. No./Substance:
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0/Sewage; 0/Soil; 0/Water Pollutants, Chemical; 7727-37-9/Nitrogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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