Abstract
Summary In Hungary, too, mining has harmful effects on the environment. Recultivation of the techno-genic areas should be considered as the regeneration of the ecological system constituting a basic functional unit of the biosphere. Since 1970 the soil biological processes going on during recultivation in the Visonta spoil fields were studied, i.e., number of microorganisms, CO2 production, decomposition of cellulose, and formation of humus. The agrobiological examinations show, as a result of favourable physical and chemical characteristics in the Visonta dump fields, that soil life can quite soon be regenerated, with the indicative data getting near to those of undisturbed top soil, after a few years of recultivation work. Visonta dumps did not need skimming and re-spreading of top soil, as the application of the meliorative methods elaborated brings about intensive biological activities, which in turn create favourable conditions for both the development of plants and further processes of soil formation.
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