"A new method for extracting soil phosphorus with 0.5 molar solutions of NaHCO at pH 8.5 is described. The method is adaptable to rapid, routine, soil-testing procedures. A theoretical basis for development of the method is described. The extraction mechanism is based on the increased solubility of calcium phosphates as a result of lowering the Ca++ activity in solution. Also, the NaHCO extracts about one-half of the amount of phosphorus on the surface of soil particles, which readily exchanges with P in the soil solution."
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