Abstract: Correspondence of the Phosphorus Saturation Ratio Threshold with Environmental Indicators of Phosphorus Loss Risk. (ASA, CSSA and SSSA International Annual Meetings (2015))

341-5 Correspondence of the Phosphorus Saturation Ratio Threshold with Environmental Indicators of Phosphorus Loss Risk.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Symposium--a Critical Assessment of Phosphorus Reduction Goals and Mitigation Strategies (SERA 17)

Wednesday, November 18, 2015: 9:00 AM

Minneapolis Convention Center, 101 FG

Vimala D. Nair¹, Biswanath Dari², Debolina Chakraborty³ and Willie Harris¹, (1)Soil and Water Sciences Dept., University of Florida, Gainesville, FL
(2)#1, University of Florida, Quincy, FL
(3)University of Florida, Gainesville, FL

Audio File Recorded Presentation

Abstract:

The controlling influence of aluminum and iron oxides on phosphorus sorption in acid soils is manifested in several environmental indicators of phosphorus loss risk. These include the phosphorus saturation ratio (PSR), equilibrium phosphorus concentration (EPC₀), water soluble P (WSP), and P adsorption model constants (Langmuir and Freundlich). The thresholds of PSR and EPC₀ correspond; in effect, EPC₀begins to precipitously increase when the PSR threshold is exceeded. Biochar and other soil amendments including the detrital material (organic matter) in wetlands have no impact on P retention below the threshold PSR.

See more from this Division: ASA Section: Environmental Quality
See more from this Session: Symposium--a Critical Assessment of Phosphorus Reduction Goals and Mitigation Strategies (SERA 17)

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