The paper presents a study on the microbiological activity and the quality of organic matter of a Haplic Luvisol soil amended with selected organic and mineral materials (manure, clay, flotation lime, aluminium and iron oxides and a bark-keratin-urea preparation), during a three-year field experiment. In the soil under analysis (pH in 1M KCl pHKCl - 4.46, organic carbon Corg. - 0.465%) the following...
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