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This article discusses an extraction method for phosphorus in organic histosol soils which can be used to establish environmental thresholds to control eutrophication of surface waters in Quebec, Canada. Vegetable crop responses were tested against the degree of phosphorus saturation using the acid-oxalate method and the water-extractable phosphorus. Yields were computed as yield in control without phosphorus divided by highest yield with added phosphorus. According to the authors, the Mehlich III extraction method accounted for the iron in the soils and computed a phosphorus saturation index with aluminum and iron.