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In this work, the authors used statistical processing of results of the long-term field several pieces of research by the method of multivariate analyze, factor analysis, and visualization of data with the use of the computer program Statistica 10. They created the multivariate Electronic Database for in-depth analysis and description of the effect of microbial preparations based on heterotrophic and phototrophic microorganisms on the efficiency of plant-microbial symbiotic systems in agrocenoses of legumes. Based on the field experiments on southern Chernozem in the steppe zone of the Crimea, the biological activity of the soil and the physiological and biochemical potential of soybean, pea, chickpea, peavine, and lentil were determined. The direction of microbiological and enzymatic processes in the rhizosphere was established, as well as interactive connections in the system “microorganisms – plants – soil”. The use of microbial preparations had a greater impact (2 times, p < 0.05) on the physiological and biochemical status of plants, crop structure, seed productivity, and grain quality. To a lesser extent, it influenced the biological activity of the soil in the agrocenosis of legumes. The advantage of using polyfunctional Cyanobacterial consortium in growing legumes for realizing the potential of plant-microbe interactions compared to monobacterization with Rhizobofit, fungi arbuscular mycorrhizae and biological products Rhizobofit, Phosfoenterin, and Biopolicyd was shown.

Up-to-date methods for isolation of cyanobacteria from soil samples, removal of accompanying microflora, obtaining axenic strains, and -conditions and media for subsequnt cultivation are reviewed. Char acterization of soil as a specific habitat for cyanobacteria is provided. Comparative analysis of pH and ele- mental composition of the liquid phase of most soil types with the media for cultivating cyanobacteria is car- ried out. The functional role of the major components required for the cultivation of cyanobacteria is de- scribed. The problems associated with isolation, purification, and cultivation of soil cyanobacteria, as well as the relevant solutions, are discussed.