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Georgia Water Resources Conference
Georgia Water Resources Conference
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ItemPhosphorus Binding by Iron-rich Soil in the Southeastern Piedmont: Implications for Point and Non-point Sources of Phosphorus(Georgia Institute of Technology, 2001-03) Mayhew, Mary C. ; Rasmussen, Todd C. ; Parker, Amanda K.A small impoundment in the Southeastern Piedmont was fertilized on three occasions during the summer of 2000. Liquid fertilizer was directly broadcast over the pond in the first two treatments; in the third treatment the fertilizer was mixed with clay soil and water. The system response to nutrient addition was measured using the Environmental Process and Control Laboratory, which measures a variety of parameters. Only ammonium (NH₄), orthophosphate (PO₄) and turbidity (TUR) are reported here. Response to the first two fertilizations was a similar, immediate elevation in levels of PO₄and NH₄. The third fertilization produced no detectable increase in PO₄and a minimal increase in NH₄. These data support the hypotheses that 1) suspended iron-rich clay from piedmont soils sequesters PO₄and 2) clay soils sequester NH₄in aquatic systems. These mechanisms of nutrient seqestration have important implications for bioavailability in piedmont systems: non-point, sediment-bound nutrients are less available than nutrients from point sources.