The effect of vermicompost on the effectiveness of Rhizobium inoculation on nodulation, yield and yield traits of fava bean at Haramaya, eastern Ethiopia, was investigated. Ten treatments were made by afactorial combination of five levels of vermicompost (0, 2, 4, 6 and 8 ton ha-1) and two levels of Rhizobium inoculation (inoculated anduninoculated. The treatments were laid out in arandomized complete block design with three replications. Analysis of variance revealed that Rhizobium inoculation, vermicompost application, cropping season and their interactions significantly (P 0.5) mean total plant N concentration. Hence, integrated application of Rhizobiumand8 ton ha-1vermicompost is needed to boost the productivity of faba bean in the study site.
