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This article in JEQ

  1. Vol. 22 No. 4, p. 678-680
    Received: Mar 8, 1993

    * Corresponding author(s):
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Estimating Phosphorus in Agricultural Runoff Available to Several Algae Using Iron-Oxide Paper Strips

  1. A. N. Sharpley *
  1. USDA-ARS, National Agric. Water Quality Lab., P.O. Box 1430, Durant, OK 74702-1430.



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.

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