The main idea of the study was to find cyanobacteria for the development of fertilizers, plant protection products and as well as for the use in agro-biotechnology. The physiological and biochemical potential of 22 strains of cyanobacteria and its influence on the efficiency of plant-microbe interactions were studied. Promising cyanobacterial strains Nostoc sp. ACSSI 57, Desmonostoc muscorum ACSSI 149, Desmonostoc muscorum ACSSI 091 can be recommended for development of biofertilizer. Strain Nostoc calcicola ACSSI 82 is promising for the development of biopreparations with herbicidal action. Strains Nostoc sphaeroides ACSSI 150 and Nostoc linckia ACSSI 271 can be used as a basis for biological stimulants and inhibitors of plant growth and development. It depends on the level of physiological parameters during cultivation in artificial media. Bacterization with one-month culture of a strain Nostoc linckia ACSSI 271 and a homogenate of the strain Nostoc sphaeroides ACSSI 150 significantly increased seed germination of Triticum aestivum L. (by 22.2 and 11.0%, p < 0.05). Strains of cyanobacteria Nostoc linckia ACSSI 271, Nostoc calcicola ACSSI 82 and Nostoc sphaeroides ACSSI 150 are able to affect the enzymatic activity and productivity of Ambrosia artemisiifolia L. Phytomass of plants after bacterization essentially (the least significant difference(0.5) is 2.31) reduced by 1.4-1.6 times (28.7-39.3%) compared to control (12.59 g/plant) and depending on the strain and its form of preparation. This suggests that bacterization with these strains is a powerful inhibitory factor for Ambrosia artemisiifolia L.

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.

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