Envirоnmentаl-stаbilizing rоle оf АСС-utilizing rhizоbасteriа in the аgrосenоses оf sоybeаn

In connection with the prevailing ecological situation, the most important place in modern agriculture should be stimulation of plant-microbial interactions, the ecological-stabilizing role of which is most clearly manifested in agrocenoses of leguminous crops. Prospective is the search and practical application of new microorganisms with polyfunctional properties, which will allow exploiting more environmentally improving potential of legumes. At the same time, the use of ACC-utilizing rhizobacteria possessing a universal anti-stress effect on plants is of particular relevance. Scientific research was carried out in 2013-2015. Within the framework of the thematic plan-task of the Ministry of Agriculture of the Russian Federation. In the experiments, the effectiveness of the introduction into the agrocenosis of soybeans of the Krasivaya Mecha of the prospective ACK-recombinant rhizobacterial strain Variovorax paradoxus 3P-4 was studied separately and in combination with the production strain of rhizobium Bradyrhizobium japonicum 634b, depending on the level of mineral nutrition of plants in the Orel region. A promising strain of ACC-utilizing rhizobacteria exerted a stimulating effect on the formation of legume-rhizobia symbiosis in soybean agrocenoses and was most effective in combination with inoculation with rhizobia. The greatest sympathy for the introduction of microorganisms in the symbiotic system of plants was characterized by a pumped background of mineral nutrition (NPK 70%). The activation of symbiotic and photosynthetic activity of soybean plants in the conditions of effective symbiosis increased their supply of macroelements by 7-15% and trace elements by 5-17%, while the efficiency of the FAP of the ground fitness exceeded the level by 18.5%, which allowed increasing the yield of grain in 1.2 times when the dose of NPK is reduced by 30%. Thus, ACC-utilizing rhizobacteria play an important ecological and stabilizing role in soybean agrocenoses, allowing to increase the production of quality grain due to more efficient use of solar energy and the realization of a better environmental potential of the crop while reducing the use of mineral fertilizers.