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ISO 20620:2021

Fertilizers and soil conditioners — Determination of total nitrogen by combustion

General information
Valid from 30.09.2021
Directives or regulations
None
Standard history
Status
Date
Type
Name
30.09.2021
Main
This document specifies a method for the determination of total nitrogen content in all nitrogen containing fertilizers by combustion method. NOTE 1   The presence of non-nutritive sources of nitrogen (e.g. chelating agents) causes positive bias to samples being analysed for nutritive nitrogen content. The non-nutritive nitrogen content is subtracted from the total nitrogen value to determine the nutritive nitrogen content. NOTE 2   Common internationally traded fertilizers were evaluated for total nitrogen by combustion analysis in the ring-study in this document. While the fertilizers analysed in this international ring study were mineral fertilizers, previous studies have shown that total nitrogen by combustion is suitable for use with many non-mineral, nitrogen-containing fertilizers.
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