Abstract
Abstract The official AOAC methods for the direct and indirect determination of available P2O5 in fertilizers were compared. The quantity of water-soluble P2O5 removed prior to the citrate extraction has a significant effect on the final available P2O5 result. The quantity of water and the technique used to remove the water-soluble fraction were evaluated. The results indicate that 250 ml and an active wash are necessary to obtain acceptable values for available P2O5. The official method for direct available P2O5 was revised editorially.
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