The response of two cultivars of blue lupine – Zeus and Kalif – to the bacterial inoculant Nitragina was estimated in this study. Field experiment was carried out in 2009-2011. It was located at the Experimental Station of the Faculty of Biology and Agriculture in Krasne, owned by the University of Rzeszów. In comparison to the control, application of Nitragina results in prolongation of the budding and flowering stages, as well as a delay in reaching the full maturity of plants. After inoculation of seeds with nodule bacteria the number of pods per plant and TSW increased significantly, whereas the number of seeds per pod did not change. The use of Nitragina resulted in a significant growth in seed yield by 0.3 t·ha^-1, i.e. 13%,as compared with the control. In 2009 cultivar Zeus gave significantly higher yield than cultivar Kalif. In following years of the study the studied cultivars yielded on a statistically similar level. Cultivar Kalif, in comparison with Zeus, was characterized by a longer growing period and significantly smaller number of pods per plant. Total protein content in seed dry matter increased significantly under the influence of bacterial inoculant in relation to seeds obtained from not inoculated plants.

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