The influence of various strains Rhizobium japonicum (Kircher) Buchanan on soybean yield

The application of new experimental strains of tubercle bacteria in soybean cultivation technology permits to obtain an extra seed yield up to 0.49 t/ha. The specificity of the action of new strains of tubercle bacteria, depend-ing on agroclimatic conditions of the year, is stated. The variety Ametist showed a positive effect of seed inoculation, that manifested itself in unfavourable years 2002 and 2004, but the highest effect occurred while applying 640b, X-9, M-8 and L-8 strains, that provided increase in seed yield within 0.14-0.30 t/ha. The variety Romantika showed a maximum effect, observed in 2009, after the application of nitrogen-fixing bacteria strains, the use of 640b, 71 t, X-9 and 36 had permitted to increase the yield in the amount of 0.22-0.31 t/ha.