Estimating Phosphorus in Agricultural Runoff Available to Several Algae Using Iron-Oxide Paper Strips
- A. N. Sharpley *
The transport of bioavailable P (BAP) in agricultural runoff can stimulate freshwater eutrophication. Previous research has shown that the amount of P removed by Fe-oxide impregnated paper strips (Fe-oxide strips) is related to the growth of Selenastrum capricornutum in laboratory incubations. As only one algal type was used, additional assays were conducted to determine if Fe-oxide strips can estimate the potential bioavailability of P in runoff to Anabaena, Ankistrodesmus, and Euglena, which are common in eutrophic waters of the Southern Plains. Algal growth was related (P > 0.001) to the amount of P extracted from runoff sediment by Fe-oxide strips. For a given strip P content of runoff sediment, algal cell count increased in the order Anabaena, Euglena, Selenastrum, and Ankistrodesmus. Thus, the amount of P removed from runoff by Fe-oxide strips, estimates the BAP content of runoff that may be potentially available for uptake by several common freshwater algae.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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