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Calcium humate as an indicator of cation exchange capacity and environmental sustainability of soil humic system

It has been shown that not all organic compounds in a multicomponent humic system determine its cation-exchange capacity and environmental stability. This active part of the soil in the form of humic acids makes up 30% of the total soil organic carbon in podzols and more than 50% in chernozems. Among the studied humic acids, their compounds with alkaline earth elements are of considerable interest. It was shown that in all soils of the transect, except for podzols, these compounds are predominant. In addition, they can serve not only as a reliable index of the cation exchange capacity (CEC) of the organic part of the soil, but also the environmental sustainability (ES) of the entire humic system. Based on the considered data of Ca and Mg humates, it is proposed to classify indices of ecological sustainability of humic systems.