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process for the production of mehrnahrstoffdungemitteln by decomposition of rock phosphate with salpetersaure, if necessary, with addition of phosphorsaure and / or sulphuric acids during decomposition
process for the production of mehrnahrstoffdungemitteln by decomposition of rock phosphate with salpetersaure, if necessary, with addition of phosphorsaure and / or sulphuric acids during decomposition