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Prediction of Algal-Available Phosphorus in Runoff Suspensions¹

ABSTRACT

Methods for estimating the potential availability of sediment-P forms are desirable for better assessment of the impact of runoff waters on surface water quality. The P sorbed by resin-affixed hydroxy-aluminum equilibrating with simulated sediment suspensions was evaluated for use as a routine means of estimating relative availability of P. A highly significant relationship (r = 0.98**, n = 5) was found between availability estimated by resin extraction and that determined by bioassay. For the soils tested, resin-extractable P averaged 98% of that found to be available to algae by bioassay.

Key Words: eutrophication • phosphate • hydroxy-Al resin

¹ Contribution from the Dep. of Soil Sci., Univ. of Wisconsin-Madison, Madison, WI 53706. Research supported by ARS Coop. Agreement no. 12-14-3001-2216 and Hatch Grant no. 1722.

² Research Assistants and Professor of Soil Science, respectively.

Received for publication April 24, 1978.

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