ИСТИНА

We modeled the processes to explain the phenomena of "non-solubilizing" volume of water in soils, which explains the increase of ion concentration in soil solution after the contact with soil. The well-known electrical double layer formation on soil particles cannot explain all the effects of non-solubilizing soil volume. The change in anion concentration in soil water extract with the time after soil saturation was studied in laboratory experiments on soil samples from Alfisol and Histosol from Yachroma valley, Dmitrov region, Moscow area, Russia, as well as from artificial organic growing media and Mollisol from Kuban area, Krasnodar region, Russia. We found that "non-solubilizing" soil volume increases with the increase in pH, but decreases after air-drying/rewetting of soil and with the increase in salt concentration in soil solution. The conducted experiments have shown that the non-solubilizing soil volume effects can be explained by the presence of organo-mineral gel covering all the surfaces on soil particles and by changing of the structure of this gel under the influence of different soil factors.