INFLUENCE OF DIRECT SEEDING ON THE TYPICAL CHERNOZEM PROFILE CARBONATE CONTENT

The variability of the carbonate profile of chernozems was studied during the long-term field experience on minimizing treatments and using no-till. The structure of the soil cover of the experimental fields is dominated by typical chernozems (Voronic Chernozems Pachic. WRB) – 82% in combination with over – dug – 12 % (zooturbated) and leached-6 %. Boiling depth and pH were used as the main properties that diagnose the acidity of soils and their variability in space and time. During one rotation (4 years), the acidity of chernozems on average showed a tendency to decrease at depths of 0-10 and 10-20 cm, respectively, by 0.18 and 0.12 pH units. The process of soil alkalinization is generally due to the natural variability of climatic parameters during the experiment. The greatest changes in acidity between technologies are associated with the use of no-till, for which significant differences in pH in a layer of 10-20 cm were revealed from all technologies using the processing of chernozems. In the conditions of the modern climatic situation in the subzone of typical chernozems, the use of no-till also leads to a decrease in the variability of the pH in the field space. In the provision of soils with nutrients, this can affect the technology and doses of mineral fertilizers.

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