The use of mass (g) or volume (cm³) as a measure of the amount of soil for determination of soil organic matter (SOM), as well as methods of quantitative analysis used for the same purpose, can directly affect the interpretation of results. Therefore, the methods of titulometric and colorimetric determination of organic matter were compared in three soils with different texture, sampling the soil based on mass and on volume. The organic matter content determined for a same soil differed between the methods. The use of mass or volume directly affected the interpretation of organic matter contents in soils with different texture.
Organic carbon; colorimetric; titration; soil texture
