Provedeno je preliminarno poljsko istraživanje na dvije lokacije s ciljem utvrđivanja utjecaja kultivara, inokulacije sjemena i navodnjavanja na poljsko nicanje, broj mahuna po biljci, broj zrna po mahuni, masu 1000 zrna, prinos zrna i koncentraciju bjelančevina u zrnu soje u uvjetima istočne Hrvatske. Utvrđen je značajan utjecaj kultivara, inokulacije sjemena i navodnjavanja na sva promatrana svojstva, izuzev poljsko nicanje na što su značajno utjecali inokulacija i navodnjavanje. Značajne interakcije ispitivanih faktora nisu utvrđene samo za poljsko nicanje. U cilju smanjenja troškova mineralnih gnojiva (prvenstveno dušičnih) i očuvanja okoliša te zbog sve sušnije klime trebalo bi provesti istraživanja o utjecaju inokulanta Nitrobakterin i navodnjavanja na svojstva različitih kultivara soje u različitim agroekološkim uvjetima.; Preliminary field research was carried out at two sites to determine the influence of cultivars, inoculation of seed and irrigation on field emergence, number of pods per plant, number of grains per pod, 1000 grain mass, yield and protein content of soybean grain in eastern Croatia. Significant influence of cultivars, inoculation of seeds and irrigation on all observed properties was determined, with the exception of field emergence, which was significantly influenced by inoculation and irrigation. Significant interactions of the investigated factors were not found only for the field emergence. Research on the influence of Nitrobacterin inoculum and irrigation on the properties of different soybean cultivars should be carried out under different agroecological conditions in order to reduce the costs of mineral fertilizers (primarily nitrogen) and environmental preservation, and in the wake of the drier climate.