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Rapid extraction of available phosphorus in fertilizers


, : Rapid extraction of available phosphorus in fertilizers. Journal of the Association of Official Analytical Chemists 74(5): 809-811

A method for the rapid extraction of available phosphorus in fertilizer involves a single-step extraction that uses ethylenediaminetetraacetic acid (EDTA) as a complexing agent for Ca and Mg. This complexation of Ca and Mg enables the analyse to avoid the preliminary water extraction currently required. Sample extraction is similar to that in method 963.03B(b), Official Methods of Analysis, 15th Ed. The extractant consists of a solution of dibasic ammonium citrate, disodium EDTA, and ammonium hydroxide. The extract or residue may be analyzed by existing AOAC methods. Results by the new extraction method agree favorably with those by existing methods. Analyses of samples from the Magruder and the Association of Florida of samples from the Magruder and the Association of Florida Phosphate Chemists check sample programme agreed favorably with reported values for neutral ammonium citrate extraction.

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