Abstract
Abstract A method for the rapid extraction of available phosphorus In fertilizers Involves a single-step extraction that uses ethylenediaminetetraacetic acid (EDTA) as a complexing agent for Ca and Mg. This complexatlon of Ca and Mg enables the analyst 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 Phosphate Chemists check sample programs agreed favorably with reported values for neutral ammonium citrate extraction.
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