[Criteria of microbial succession in soil]

The dynamics of bacterial and fungal incidence in two sharply different soil samples after the addition of water and glucose was studied using direct microscopic techniques and a technique of inoculation in growth media. The ratio of the population density indices established by means of microscopy to those found from the data of inoculation characterizes the stage of microbial succession. The techniques of microscopy and inoculation are equitable, furnish different information, and must be used in parallel while examining various problems pertinent to the dynamics of the soil microflora incidence.