The determination of organic carbon contents oxidized by Walkley–Black for analysis organic carbon in soils of Thailand
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Abstract
The determination of organic carbon contents was oxidized by Walkley–Black to detect the organic carbon in soils of Thailand. The relationship of organic carbon contents in soil textures from 1,787 samples was analyzed by the Walkley-Black and the dry combustion methods (NCS analyzer). The results from Walkley-Black method showed that the contents of oxidized organic carbon in each soil textures ranged from 69-78%. The correction factor for multiplying organic carbon contents by the Walkley-Black method was in the range of 1.28 - 1.44 and the correction factor average 1.31 that revealed no significant difference in all soil textures. Therefore, in order to predict the total organic carbon contents from Walkley-Black method in all soil textures, more studies should be carried out to cover the texture of each type of soil as well as the effects of other factors such as soil pH, soil depth, soil management, and vegetation in the area. It will be useful in getting right correlation or CF values in all areas.
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