Agrophysical properties and soil biota were studied in Haplic Kastanozems Chromic (calcareous soils) in Central Anatolia (Konya province, Ćumra region). These heavy textured (medium clay) soils with a low content of organic carbon (less than 1%) have favorable biophysical properties due to the stable structure of the pore space. The favorable structure of the pore space is suggested to be stipulated by the activity of the numerous and diverse representatives of soil biota. Actinobacteria is the dominant in four phyla in the microbiological composition of the soils studied. The composition of this phylum is dominated by the elevated number of both higher (Streptomyces) and lower (three species of Rhodococcus) actinobacteria. The high biodiversity of bacteria against the background of their great total number and the developed tropics interactions in the microbial community promote the well balanced production of specific metabolites, including gaseous ones (CO2, H2). This circumstance allows this clayey soil to function rather actively while protecting the pore space against compaction and maintaining the optimal density, porosity, and hydrological properties.

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