The research results on studying of an influence of an inoculation and mineral nitrogen
application for symbiotic activity and seed production of different varieties of soya bean are
presented in this article. All these researches were conducted in the All-Russia Scientific
Research Institute of grain legumes and cereal crops in 2011- 2013. Symbiotic and
productive ability of new soya varieties Zusha and Mezenka in comparison with the standard
Lantsetnaya variety is studied. It is established that formation of the symbiotic device and its
activity depended on a preseeding inoculation of seeds bacterial fertilizer (nitragin) and also
on presence of spontaneous populations of rhizobium in the soil. The period duration of a
symbiotic nitrogen-fixing depended on varietal features and was longer at Zusha and
Mezenka's more late-season varieties. Seeds inoculation by nitragin was surpassed in
efficiency of mineral nitrogen application in a dose of 60 kg per hectare. An addition yield
reached 2,6 c/hectare. Different reactions of varieties when forming a crop on distribution of
rainfall during the growth season was noted. Having prevalence of rainfall in the first half of
summer on formation of a crop early ripening varieties which used spring soil deposits of
moisture and rainfall of May-June more rationally had advantage, less suffering from a July-
August drought and a heat. More late-ripening varieties had advantage in case of better
providing with rains if the second half of summer. The heavy yield – 30,7 c/hectare (on
average for 3 years) created Mezenka variety.
doi: 10.15217/279700