The precision and recovery of the determination of total nitrogen content in organic fertilizers by Dumas combustion method and the method in industry standard"Organic Fertilizer"(NY/T 525-2021)are investigated.The results show that the total nitrogen mass fraction of the five organic fertilizer samples measured by the method in NY/T 525-2021 is 1.76%to 3.83%,and the recovery is 99.5%to 101.0%.The mass fraction of total nitrogen in five organic fertilizer samples measured by Dumas combustion method is 1.70%to 3.84%,and the recovery is 98.1%to 104.7%.The relative standard deviation of the two methods is 0.18%to 2.45%,both of which can meet the requirements of the determination of total nitrogen content in organic fertilizer.Compared with the method in NY/T 525-2021,Dumas combustion method has the characteristics of convenient and safe operation,high degree of automation and short measurement time.
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