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VLCEK VITĚZSLAV, HLADKÝ JAN, KYNICKÝ JINDŘICH, BRTNICKÝ MARTIN. 2015. Main Feedbacks Between Oxidizable Carbon Content and Selected Soil Characteristic of Chernozem. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 63(2): 471–476. Anthropogenic pressure on our agricultural land is culminating last hundred years, especially a er 1948, not only because of only massive application of mineral fertilizers but also because of land consolidation and subsequent accelerated water and wind erosion and use of mechanization. This article focuses on main demonstration of feedbacks especially with oxidizable carbon which can negatively aff ect soil as a homeostatic system. Oxidizable carbon, as the basis of soil humus, is crucial for maintaining soil fertility and for its resistance to further degradation factors aff ecting the soil. 35 chernozem sites were selected in South Moravia region. These soils had been probably used for their fertility and availability before the turn of the AD. Unfortunately, their long-term agricultural use has resulted in adverse impact on their quality. This way, shallower forms of erosion were o en formed. These erosion forms are omitted for the purposes of our study there. For this work, locations with preserved chernic (i.e. diagnostic) horizon, as the horizon with less anthropogenic infl uence, were selected. Relations between a grain size (clay, silt and sand particles), exchange reaction in soil, sorption capacity, oxidizable carbon content, total nitrogen content and content of selected potentially acceptable elements (Ca, Mg) were monitored.