Document Detail

Estimating source coefficients for phosphorus site indices.
MedLine Citation:
PMID:  17071889     Owner:  NLM     Status:  MEDLINE    
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.
H A Elliott; R C Brandt; P J A Kleinman; A N Sharpley; D B Beegle
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-10-27
Journal Detail:
Title:  Journal of environmental quality     Volume:  35     ISSN:  0047-2425     ISO Abbreviation:  J. Environ. Qual.     Publication Date:    2006 Nov-Dec
Date Detail:
Created Date:  2006-10-30     Completed Date:  2007-01-03     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0330666     Medline TA:  J Environ Qual     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2195-201     Citation Subset:  IM    
Dep. Agricultural and Biological Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
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MeSH Terms
Abstracting and Indexing as Topic*
Environmental Monitoring*
Manure / analysis*
Organic Chemicals / analysis
Phosphorus / analysis*
Soil Pollutants / analysis*
Water Movements
Water Pollutants / analysis*
Reg. No./Substance:
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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