Abstract
Ranker, or humus-silicate soil, is one of the most represented types of soil in the hilly-mountainous region of Western Serbia. Aiming to determine biogenity of such type of soil in Western Serbia, representation of the total microflora, fungi, actinomycetes, ammonifiers, azotobacter and oligonitrophiles has been examined as well as dehydrogenase activity of this type of soil. The samples were taken from soils used in three different ways: plough-fields, orchards and forests. The standard microbiological methods of introducing in certain decimal dilutions on the appropriate nutritive medium were used. The obtained results showed small biota of the tested soil. No correlation between a number of the stated groups of microorganisms and the way of using the soil was found. The highest dehydrogenase activity was shown by forests. The number of azotobacter, as soil fertility indicator, was small in the forest regions.
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