Evaluating phosphorus release from biosolids and manure-amended soils under anoxic conditions

Journal of Environmental Quality
Amy L Shober, J Thomas Sims

Abstract

The solubility of P in biosolids and manures has been shown to influence the potential for dissolved P losses in runoff and leachate when these materials are land applied. As a result, some Mid-Atlantic US states have developed P source coefficients (PSCs) to account for differences in P solubility between fertilizers, manures, and biosolids in P risk assessment tools. The reliability of these PSCs has not been evaluated under anoxic conditions, where environmental changes may affect the P solubility of biosolids or manures. The objective of this study was to assess the effects of anoxic conditions on the release of P from a range of Mid-Atlantic soils amended with manures and biosolids. The concentration of dissolved P released into solution (0.01 mol L(-1) NaCl) from the Pamunkey, Berks, and Manor soils was significantly lower under reducing conditions than under oxidized conditions (median DeltaP = -0.70, -0.49, and -0.07 mg L(-1), respectively; all significant at the 0.001 probability level). There was no significant P source effect on dissolved P released into solution after anoxic incubation of soils. Calculated solubility diagrams and increases in oxalate-extractable Fe and P sorption index under reducing conditions for ...Continue Reading

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Citations

Sep 29, 2012·Environmental Science & Technology·R HendersonA Thompson
May 12, 2010·Foodborne Pathogens and Disease·Jie WeiKalmia E Kniel
Nov 26, 2009·Applied and Environmental Microbiology·Jie WeiKalmia E Kniel
Jan 15, 2019·Journal of Environmental Quality·Randombage S DharmakeerthiDoug Goltz
Oct 6, 2020·Journal of Environmental Quality·Luis F AndinoJennifer M Fraterrigo

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