90.20 Standard under periodical review Jul 15, 2026
ISO
ISO/TC 134 Fertilizers, soil conditioners and beneficial substances
International Standard
65.080 Fertilizers
ISO 25475:2016 specifies a method for the determination of the ammoniacal nitrogen content in fertilizers. The method is applicable to all nitrogenous fertilizers including compound fertilizers, in which nitrogen is found exclusively either in the form of ammonium salts or ammonium salts together with nitrates.
ISO 25475:2016 is not applicable to fertilizers containing urea, cyanamide or other organic nitrogenous compounds.
PUBLISHED
ISO 25475:2016
90.20
Standard under periodical review
Jul 15, 2026