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]).
EN 15957:2011 Referenced Document
EN 12944-1:1999 Fertilizers and Liming Materials - Vocabulary - Part 1: General Terms
EN 12944-2:1999 Fertilizers and Liming Materials - Vocabulary - Part 2: Terms Relating to Fertilizers
EN 1482-2 Fertilizers and liming materials - Sampling and sample preparation - Part 2: Sample preparation
EN 15957:2011 history
2011EN 15957:2011 Fertilizers - Extraction of phosphorus which is soluble in neutral ammonium citrate