CEN/TS 17757:2022

This document specifies references to methods for the determination of the content of the following specific nutrients in inorganic fertilizers:
-  the total nitrogen content;
-  the ammoniacal nitrogen content;
-  the nitric nitrogen content;
-  the urea nitrogen content;
-  the content of nitrogen from isobutylidenediurea (IBDU) and crotonylidenediurea (CDU);
-  the cyanamide nitrogen content;
-  the methylene-urea nitrogen content (and urea formaldehyde, if applicable);
-  the total phosphorus content;
-  the water-soluble phosphorus content;
-  the neutral ammonium citrate soluble phosphorus content;
-  the water-soluble potassium content;
-  the total magnesium content;
-  the water-soluble magnesium content;
-  the total calcium content;
-  the water-soluble calcium content;
-  the total sulfur content;
-  the water-soluble sulfur content;
-  the total sodium content;
-  the water-soluble sodium content.
This document is applicable to EU fertilizing products classified as PFC 1(C) and PFC 7 as long as the blend only consists of EU fertilizing products classified as PFC 1(C), PFC 2 and PFC 5 as specified in the Regulation (EU) 2019/1009 [1].