Abstract
The influence of humidity of typical Chernozem on the acidity and cationic composition of various energy fractions of the equilibrium soil solution was studied. As the object of research, we used soil solutions extracted by pressure (PSS) from the samples of the arable horizon of typical Chernozem contaminated with Zn, after the completion of the growing experiment with the test culture – barley. The studies of the cationic composition and acidity of quasi-equilibrium soil solutions dependence on the humidity of Chernozem were carried out in the humidity range of 11–40%, i.e., in the range of productive moisture available to plants (pF: 2.17–4.45). For the PSS of variants “bare fallow” and “barley” (Zn0, Zn250 and Zn500), with a decrease in the residual humidity of the sample in the studied range, the concentration of the studied metals in the sequentially extracted PPR fractions also decreased. The acidity of the quasi-equilibrium PSS with increasing humidity (with dilution) decreased. The changes reached 2 pH units. For all the energy fractions of PSS, there was a decrease in acidity for the “barley” variants (Zn0, Zn250, Zn500) compared to the “bare fallow” variants.
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