The aim of the present research was to define selected enzymatic activities and hydrolysis of starch, cellulose, chitin, pectins, proteins and dissolution of Ca3(PO4)2 of Actinomycetes of Streptomyces isolated from soil and potato rhizosphere. The size of hydrolysis zones of the substrates researched as a consequence of enzymatic activities showed a high activity of the Streptomyces strains tested. The greatest number of strains used starch and cellulose (CMC-Na medium) as their source of carbon and gelatine. The lowest number of isolates used pectins on pH 5.2 medium and cellulose powder. The production of chitynase in all the Actinomycetes was quite common (75 %), like the ability to dissolve Ca3(PO4)2 (70 % of strains).

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