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The effect of inoculation (plating) together with the use of boron and molybdenum micro fertilizers on productivity of common vetch seeds The article deals with the study of the effect of inoculation (plating) of the grain forage common vetch variety ‘Lugovskaya 98’ made by the production strains of nodule bacteria №112,142,145 in the combination with boron and molybdenum micro fertilizers on the formation of grass stand structure and productivity. It has been determined that the variety possesses a high susceptibility to plant-rhizobial interaction with nodule bacteria №142 or 145 and responsiveness to the effect of molybdenum. In the controlled conditions of vegetation and under favorable growing regime of moisture supply, the inoculation with the production strains and seed treatment with microelements had a positive effect upon the formation of structure and seed productivity of common vetch. The application of inoculant fertilizer and micro fertilizers stimulate the process of nodule formation that increases the number of active root nodules in 1.6-2.0 times during the bud-formation period. As a result a number of beans per plant rise on 58-86%, bacterial number rises on 13-28% compared with the control variety. Under the favorable conditions with sufficient moisture supply during vegetation periods the application of inoculant fertilizers together with the strains №142 and №145 increased the productivity of vetch seeds on 12-15%. The application of molybdenum is of great effect both in the combination with the selected strains of nodule bacteria and with the spontaneous populations. The complex application of the strain №142 with molybdenum increases number of beans on 13% and bacterial number on 10%. Thus, the improvement of the main parameters of the structure the productivity of vetch increases on 15% in comparison with the control variety. Under more favorable conditions during vegetation period the increase of vetch productivity was 24%. The additional use of boron had no significant effect on the efficiency of the combined use of the strain №142 and molybdenum. The interaction of molybdenum and boron during their combined use for pre-sowing treatment of vetch seeds is non-additive. The pre-sowing treatment of seeds just by molybdenum increases seed productivity on 12%. If the soil contains active spontaneous nodule bacteria, according to the results of molybdenum effect on vetch productivity, its application can be compared with the seed inoculation by production strain.