Fertilizers - Determination of urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) using high-performance liquid chromatography (HPLC); German version EN 15688:2008— 12 стр.
Fertilizers and liming materials - Vocabulary - Part 1: General terms (including corrigendum AC:2000); German version EN 12944-1:1999 + AC:2000— 10 стр.
Fertilizers and liming materials - Vocabulary - Part 2: Terms relating to fertilizers (including corrigendum AC:2000); German version EN 12944-2:1999 + AC:2000— 8 стр.