BS EN 15558 is a European standard that serves technical specifications for the determination of nitric and ammoniacal nitrogen in fertilizers, which enables the availability of nitrogen in plant roots for optimum plant growth.
BS EN 15558 specifies a method for the determination of nitrate and ammoniacal nitrogen with reduction according to Ulsch.
BS EN 15558 method is applicable to all nitrogenous fertilizers, including compound fertilizers, in which nitrogen is found exclusively in nitrate form, or in ammoniacal and nitrate form.
BS EN 15558 on Nitric and ammoniacal nitrogen in fertilizers applies to:
Ammoniacal Nitrogen is a nitrogen-rich material derived from ammonia. Before it can be taken by plant roots, it must first be transformed to nitrate nitrogen by soil microorganisms. A readily available form of artificial nitrogen fertiliser for plant roots is nitrate nitrogen. Due to quick response, nitric nitrogen is used as top dressings on growing crops.
BS EN 15558 provides users guidance on a method for the determination of nitrate and ammoniacal nitrogen with reduction using Ulsch. BS EN 15558 also provides users with a step-by-step procedure for the method, enabling users to do the method correctly.
BS EN 15558 provides users guidance on principle, reagents, apparatus, sampling, sample preparation, procedure, calculation, expression of results, precision, and test report, enabling the accurate determination of nitric and ammoniacal nitrogen in fertilizers for stimulation in root growth and reduced acidification in agricultural applications.
With obedience and compliance of BS EN 15558, users can assess the content of nitric and ammoniacal nitrogen in fertilizers that reduce acidification, stimulate root growth and improve water use efficiency in plants for higher yields.
BS EN 15558:2009 supersedes CEN/TS 15558:2007, which is now withdrawn.
EN 15558:2009