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Evaluation of organic carbon oxidation efficiencies of a...

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Evaluation of organic carbon oxidation efficiencies of a modified wet combustion and Walkley-Black procedures in Nigerian soils.

The organic carbon (C) oxidation efficiencies of the Walkley-Black and modified wet combustion procedures were evaluated in soil samples taken from different ecological zones and diverse parent materials in Nigeria. Dry combustion using a C analyzer was the standard to evaluate the efficiency of the modified wet combustion method. The efficiency of the Walkley-Black method was later compared to that of the modified wet combustion procedure. The results indicated that the modified wet combustion and the dry combustion procedures were highly correlated (r=0.99**). Significant correlation (r=0.96**) was also found between the Walkley-Black and the modified wet combustion procedures. There was no correlation between the C data obtained using the modified wet digestion method and the % DCB-Fe2O3. These results suggest the absence of strong organo-mineral complexes in these soils. Organic C recoveries by the Walkley-black method were not affected by fine-grinding (less than or equal to 0.5 mm) of the soil samples. It is suggested that both the modified wet combustion and the Walkley-Black methods may be used without a correction factor in Nigerian soils. The modified wet combustion procedure was also found to be an adequate substitute for the dry combustion procedure.

Journal Title: Communications in soil science and plant analysis.
Journal Volume/Issue: 1998. v. 29 (17/18)
Main Author: Olayinka, A.
Other Authors: Adebayo, A., Amusan, A.
Format: Article
Language: English
Subjects: soil analysis
chemical analysis
carbon
organic compounds
chemical composition
measurement
organic matter
soil test values
correlation
oxidation
Nigeria
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