| Estimating source coefficients for phosphorus site indices. | |
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MedLine Citation:
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PMID: 17071889 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Phosphorus release to runoff varies widely for different land-applied organic P sources even when spread at equivalent total P rates. To address this variability, some P site indices include tabulated P source coefficients (PSCs) for differential weighting of applied P materials based on their runoff enrichment potential. Because runoff P can vary widely even within source categories depending on composition, storage, and treatment differences, this study explored a method for estimating PSCs based on the water-extractable P (WEP) content of the applied amendment. Using seven published rainfall-runoff studies that followed National Phosphorus Research Project protocols, runoff dissolved P (RDP) was correlated (r(2) = 0.80) with WEP for multiple surface-applied manures and biosolids. Assuming amendments with WEP >/= 10 g kg(-1) behave as highly soluble P sources and have a maximum PSC of 1.0, an empirical equation was developed for computing source-specific PSCs from laboratory-determined WEP values [PSC = 0.102 x WEP(0.99)]. For two independent runoff experiments, correlations between RDP loss and P source loading rate were improved when loading rates were multiplied by the computed (r(2) = 0.73-0.86) versus generic (r(2) = 0.45-0.48) PSCs. Source-specific PSCs should enhance the ability of assessment tools to identify vulnerable sites and P loss management alternatives, although the exact inclusion process depends on index scaling and conceptual framework. |
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Authors:
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H A Elliott; R C Brandt; P J A Kleinman; A N Sharpley; D B Beegle |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2006-10-27 |
Journal Detail:
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Title: Journal of environmental quality Volume: 35 ISSN: 0047-2425 ISO Abbreviation: J. Environ. Qual. Publication Date: 2006 Nov-Dec |
Date Detail:
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Created Date: 2006-10-30 Completed Date: 2007-01-03 Revised Date: 2007-11-15 |
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: 2195-201 Citation Subset: IM |
Affiliation:
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Dep. Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16802, USA. hae1@psu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abstracting and Indexing as Topic* Agriculture Animals Cattle Environmental Monitoring* Manure / analysis* Organic Chemicals / analysis Phosphorus / analysis* Poultry Soil Pollutants / analysis* Solubility Water Movements Water Pollutants / analysis* |
| Chemical | |
Reg. No./Substance:
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0/Manure; 0/Organic Chemicals; 0/Soil Pollutants; 0/Water Pollutants; 7723-14-0/Phosphorus |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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