本文件规定了用燃烧法测定所有含氮肥料中总氮含量的方法。 注1:氮的非营养来源（例如螯合剂）的存在会导致分析样品营养氮含量的正偏差。从总氮值中减去非营养氮含量，以确定营养氮含量。 注2:在本文件的环研究中，通过燃烧分析对国际上常见的肥料进行了总氮评估。虽然本国际环研究中分析的肥料是矿物肥料，但之前的研究表明，燃烧产生的总氮适合与许多非矿物、含氮肥料一起使用。

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.