Estimating source coefficients for phosphorus site indices

Herschel Adams Elliott, R. C. Brandt, Peter J A Kleinman, A. N. Sharpley, Douglas Brian Beegle

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

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 (r2 = 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 WEP0.99]. For two independent runoff experiments, correlations between RDP loss and P source loading rate were improved when loading rates were multiplied by the computed (r2 = 0.73-0.86) versus generic (r2 = 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.

Original languageEnglish (US)
Pages (from-to)2195-2201
Number of pages7
JournalJournal of Environmental Quality
Volume35
Issue number6
DOIs
StatePublished - Nov 1 2006

Fingerprint

site index
Runoff
Phosphorus
runoff
phosphorus
Water
Biosolids
water
Manures
biosolid
conceptual framework
Rain
manure
rainfall
Chemical analysis
rate

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Elliott, H. A., Brandt, R. C., Kleinman, P. J. A., Sharpley, A. N., & Beegle, D. B. (2006). Estimating source coefficients for phosphorus site indices. Journal of Environmental Quality, 35(6), 2195-2201. https://doi.org/10.2134/jeq2006.0014
Elliott, Herschel Adams ; Brandt, R. C. ; Kleinman, Peter J A ; Sharpley, A. N. ; Beegle, Douglas Brian. / Estimating source coefficients for phosphorus site indices. In: Journal of Environmental Quality. 2006 ; Vol. 35, No. 6. pp. 2195-2201.
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Elliott, HA, Brandt, RC, Kleinman, PJA, Sharpley, AN & Beegle, DB 2006, 'Estimating source coefficients for phosphorus site indices', Journal of Environmental Quality, vol. 35, no. 6, pp. 2195-2201. https://doi.org/10.2134/jeq2006.0014

Estimating source coefficients for phosphorus site indices. / Elliott, Herschel Adams; Brandt, R. C.; Kleinman, Peter J A; Sharpley, A. N.; Beegle, Douglas Brian.

In: Journal of Environmental Quality, Vol. 35, No. 6, 01.11.2006, p. 2195-2201.

Research output: Contribution to journalArticle

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