Effect Inoculation of Soybean Cultivars with bacteria Rhizobium japonicum in Sistan

This study is performed in order to investigate the inoculation effects of soybean cultivars with Rhizobium japonicum bacteria on yield and yield performance of these cultivars. The experiment was in the form of randomized complete block design split plots which conducted at Agricultural and Natural Resource Center of Zahak with three replication in 2012-2013. Experimental levels were consisted of non-inoculated and inoculated with rhizobium bacteria as the main factor, and the cultivars (varieties) factor with six level included M7, Sahar, Williams, M9, Zan, L17 which distributed in subplots randomly. The investigated quantitative and qualitative characters in this study consisted of plant height, number of pods per plant, number of seeds per pod, grain weight, biological yield, harvest index, raw protein, raw fat; and phonological traits included flowering onset, flowering period, and physiological maturity. The comparison between the obtained results and the results of control treatment (non -inoculated) and also the results of other studies illustrated the optimized and desired effect of inoculation on the traits such as yield and raw fat rate, so that in non-inoculation treatment grain yield decreased (the obtained yield was 1058.6kg/ha). Inoculation treatment with an increase of 9.91 percent, improved the grain yield which reached to the amount of 1190.4kg/ha. Among the experimental varieties, M7 with an average of 1467.5kg/ha had the highest grain yield, while the least amount of yield belonged to Zan and Sahar with the average of 861.2kg/ha. Interaction between inoculation and cultivar on all of the characters was not significant. Based on the results of this study, we conclude that the use of inoculated M7 variety can be introduced as the recommended cultivar among other varieties.