应用杜马斯燃烧法及凯氏定氮法对肥料中总氮含量分别进行测定.结果表明,杜马斯燃烧法的测定结果略高于凯氏定氮法的测定结果.杜马斯燃烧法测定结果的相对标准偏差分别为0.14%,0.15%,0.18%,0.23%,1.56%,1.03%,加标回收率均值分别为98.9%,99.1%,98.1%,97.9%,98.1%.凯氏定氮法测定结果的相对标准偏差分别为0.17%,0.35%,0.46%,0.24%,2.40%,1.24%,加标回收率均值分别为98.2%,98.1%,97.4%,96.7%,96.3%.因此,杜马斯燃烧法可作为肥料总氮检测的方法之一.