EN
The effect of the celulolitic bacteria Azospirillum spp. and Pseudomonas stutzeri on the biological activity of the medium alluvial soil amended with the wheat straw (series with mineral nitrogen and without nitrogen) was investigated. In the pot experiments, the authors determined: the total number of bacteria, actinomycetes, fungi, activity of dehydrogenase. The total content of organic matter and organic nitrogen in the soil were determined also. The investigated changes of the ratio of the total number of bacteria and total number of fungi in the soil may be proposed as one of the indices of soil fertility. It was found that the soil amended with wheat straw (with mineral nitrogen and without nitrogen) and inoculated with celulolitic bacteria Azospirillum spp. showed higher biological activity, than uninoculated one.