Abstract
Abstract A wide range of phosphate fertilizers were analyzed for watersoluble phosphorus to compare 2 recognized methods: AOAC method 2.040 and the International Organization for Standardization (ISO) method No. 5316. In general, the ISO method extracted more phosphorus from triple and normal superphosphates; the AOAC method extracted more phosphorus from diammonium, monoammonium, and nitric phosphates. Both methods exhibited similar precision. The results indicate that care must be exercised when data for watersoluble phosphate are reported.
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