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Abstract
Carbon and nitrogen (N) content of various soils in the world were analyzed using a CNS‐2000 (LECO, Corp., St. Joseph, MI) analyzer. The results were in good agreement with those obtained by a laboratory proficiency test at the International Soil‐Analytical Exchange, organized by Wageningen Agricultural University, Wageningen, The Netherlands. The best agreement for both elements was observed at a combustion temperature of 1000°C. Results of organic carbon (C) determined by the Tyurin method were closely related to results of C determination at this temperature. Higher C contents were obtained with samples rich in carbonates when analyzed at higher temperatures >1000°C. These results confirm the suitability of automated dry combustion in soil analysis for C and N.