A new method of calculating the thermodynamic characteristics of humus substances on the basis of their elemental composition is suggested. It is suitable for all humus fractions, permitting the calculation of the following parameters under the standard conditions: the heat capacity C_p, the absolute entropy S~O, the entropy of formation nabla S~O, the free energy of formation triangle open S~O, the free energy of formation triangle open G~O, the heat of formation triangle open H~O, and the heat of combustion Q_O. It was established that the irrigation of chernozem and dark and light chestnut soils alters the thermodynamic parameters of humic acids. There is an increase in the heat of combustion, the heat of formation, the free energy, and the entropy of formation.
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