ISO 20620:2021 PDF

Scope: 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.

ISO 20620:2021 Referenced Document

ISO 14820-2:2016 Fertilizers and liming materials - Sampling and sample preparation - Part 2: Sample preparation

2021 ISO 20620:2021 Fertilizers and soil conditioners - Determination of total nitrogen by combustion