DS DS/EN 15957
DS DSEN 15957 2011-NOV-04 Fertlzers - Extracton of phosphorus whch s soluble n neutral ammonum ctrate
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This document specifies a method for the extraction of phosphorus soluble in neutral ammonium citrate. The method is applicable to all fertilizers in respect of which solubility in neutral ammonium citrate is laid down in Regulation (EC) 2003/2003, Annex I (see [2]).