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Scientia Agricola

versão On-line ISSN 1678-992X

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SATO, Juliana Hiromi et al. Methods of soil organic carbon determination in Brazilian savannah soils. Sci. agric. (Piracicaba, Braz.) [online]. 2014, vol.71, n.4, pp.302-308. ISSN 1678-992X.  https://doi.org/10.1590/0103-9016-2013-0306.

Several methods exist for determining soil organic carbon, and each one has its own advantages and limitations. Consequently, a comparison of the experimental results obtained when these methods are employed is hampered, causing problems in the comparison of carbon stocks in soils. This study aimed at evaluating the analytical procedures used in the determination of carbon and their relationships with soil mineralogy and texture. Wet combustion methods, including Walkley-Black, Mebius and Colorimetric determination as well as dry combustion methods, such as Elemental and Gravimetric Analysis were used. Quantitative textural and mineralogical (kaolinite, goethite and gibbsite) analyses were also carried out. The wet digestion methods underestimated the concentration of organic carbon, while the gravimetric method overestimated. Soil mineralogy interfered with the determination of carbon, with emphasis on the gravimetric method that was greatly influenced by gibbsite.

Palavras-chave : soil organic matter; wet combustion; dry combustion.

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