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Effect of Soil Reduction on Phosphorus Sorption of an Organic-Rich Silt Loam.
- Source :
- Soil Science Society of America Journal; Jan/Feb2010, Vol. 74 Issue 1, p240-249, 10p, 4 Charts, 6 Graphs
- Publication Year :
- 2010
-
Abstract
- Phosphorus flux from agricultural landscapes to surface waters may cause eutrophication. In the northeastern United States, P transport largely depends on P sorption of soils in variable source areas or in land treatment systems. Soil redox fluctuation commonly occurs in these areas. Nevertheless, the effect of soil redox on P sorption has been variable in the literature. This study investigated P sorption of an organic-rich northeastern glaciated silt loam (Langford) under air-dried, field-wet, and reduced conditions using batch P sorption experiments. Additionally, the influence of farm wastewater on soil P sorption was studied. Major results indicated that soil reduction increased the maximum amount of P that can be sorbed (S<subscript>max</subscript>) and decreased the aqueous P concentration at which P sorption and desorption are equal (EPC<subscript>0</subscript>), both determined from a modified Langmuir isotherm model. The slightly reduced field-wet soils had no significant difference in S<subscript>max</subscript> due to limited soil reduction. Using the diluted wastewater as the sorption solution matrices instead of 0.01 mol L<superscript>-1</superscript> KCI solution, the soils generally exhibited greater S<superscript>max</superscript> and lower EPC<subscript>0</subscript> except for the EPC∅ of a reduced surface soil, implying more complex P sorption in the field. Identified P sorption mechanisms include phosphate precipitation, ligand exchange with organic matter, and adsorption onto Fe hydroxides. Transformation of Fe compounds during soil reduction is primarily responsible for the changes in soil P sorption. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03615995
- Volume :
- 74
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Soil Science Society of America Journal
- Publication Type :
- Academic Journal
- Accession number :
- 47605101
- Full Text :
- https://doi.org/10.2136/sssaj2009.0123