The paper is an attempt of quantification of clay minerals influence upon the population of certain groups of micro organisms from soil. The aim of this paper is to verify and to validate the earlier established relationships between soil biological and mineralogical parameters in a context of qualitatively and quantitatively extended pedological information. The obtained results confirm to a great extent the former ones. Thus, the established relationships between biological and mineralogical parameters indicate that the bacteria and fungus number are closer related to the clay quality than to its quantity. The same relationships show that between the soil biological indicators and clay iolite content there is a direct linear relation, while between the same biological parameters and the clay smectite content this linear relation is inversed. The confirmation of these relationships on statistical basis, using results of physical and chemical determinations, becomes more difficult when the number and complexity of the considered situations are increased.

clay minerals; clay minerals - micro organism relationships

Presentation: oral