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(0 - 25 cm). The Ban Phai series planted with Eucalyptus had highest organic carbon

content (0.48%) followed by sugarcane and cassava, respectively. While, organic carbon
content in Chatturat series had trend to be highest in corn (0.98%) followed by
sugarcane and cassava. In addition, the Phon Phisai series had highest organic carbon in
para rubber plantation (1%) followed by sugarcane and dipterocarp. As the result

mentioned that land use had affected on soil organic carbon content which governed by
quantity of residue biomass and its chemical composition.
The result of organic carbon accumulation under different organic residue
application, considering on Khorat series, the soil incorporated with tamarind leaf had

highest organic carbon content (0.36%) followed by groundnut stover, diperocarp and
rice straw. The lowest organic carbon was found in soil with no addition. In case of Nong
Bun Nak series, organic carbon content had highest in soil incorporated with rice straw
(0.84%), followed by rice straw mulching (0.72%). In addition, we found that the applied

organic residue with high decomposition rate and carbon dioxide evolution led to low
organic carbon accumulation in soil. The result found that the decomposition rate and
carbon dioxide evolution was positively correlated with cellulose (r= 0.70*) but
negatively correlated with lignin (r= -0.85***) and polyphenol (r= -0.81**) contents.

The result reported status and dynamic of soil organic carbon in Northeast
Thailand in this document is to be used for managing strategy-effectiveness on soil
carbon sequestration in long-term.