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Biological nitrogen fixation represents the subject of numerous investigations of the scientific community. The advantages of this process, as already well known while scientific research trials attempts to clarify the interactions of symbionts in this type of nitrogen fixation as well as the influence of abiotic factors on its efficacy. A field experiment was conducted to investigate the influence of garden pea cultivars (\u27Alicia\u27 and \u27Miracle of America\u27), seed inoculation with nodule bacteria (Rhizobium pisi DSM 30132, and Rhizobium leguminosarum bv. viciae OS–103), and nitrogen fertilization (0, 30 and 60 kg N*ha-1). The observed parameters are: stand density, number of pods, mass of 1,000 grains, mass of pods and grains and grain yield. It was established that all the investigated factors significantly influenced the traits. The seeds inoculated with the indigenous strain R. leguminosarum bv. viciae OS–103 had significantly increased numbers of pods per unit area, grain yield, and the weight of 1,000 grains, while a higher amount of applied nitrogen resulted only in an increase of grain yield. Cultivar \u27Alicia\u27 achieved a significantly higher grain yield compared to the \u27Miracle of America\u27 cultivars, while application of 60 kg N*ha-1 achieved statistically higher grain yield compared to control. Inoculation with R. leguminosarum bv. viciae OS-103 produced a significantly higher grain yield compared to inoculation with the reference strain R. pisi DSM 30132. The observed parameters were significantly influenced by the garden pea cultivar, seed inoculation with nodule bacteria, and nitrogen fertilization therefore further investigation are needed with new inoculant strains and new cultivars under different agroecological conditions.Biološka fiksacija dušika predstavlja predmet mnogobrojnih istraživanja znanstvene zajednice. Prednosti ovog procesa, kao što je već dobro poznato, su mnogobrojne dok se znanstveno-istraživačkim pokusima nastoje razjasniti interakcije simbionata u ovoj vrsti fiksacije dušika kao i utjecaj abiotskih faktora na njenu djelotvornost. S ciljem ispitivanja utjecaja kultivara vrtnog graška (\u27Alicia\u27 i \u27Čudo Amerike\u27), inokulacije sjemena kvržičnim bakterijama (Rhizobium pisi DSM 30132 i Rhizobium leguminosarum bv. viciae OS–103) i gnojidbe dušikom (0, 30 i 60 kg N*ha-1) proveden je poljski pokus. Promatrani parametri su uključili: sklop biljaka, broj mahuna, masu 1000 zrna, masu mahuna i zrna i prinos zrna. Rezultati istraživanja su potvrdili kako su svi ispitivani faktori značajno utjecali na ispitivana svojstva. Inokulacija sjemena sojem OS–103 značajno povećava broj mahuna po jedinici površine, prinos zrna i masu 1000 zrna, dok se povećanjem količine primijenjenog dušika dosljedno povećava samo prinos zrna. Kultivar Alicia je postigao značajno veći prinos od kultivara Čudo Amerike, dok je primjenom 60 kg N*ha-1 ostvaren statistički značajno veći prinos u usporedbi s kontrolom. Inokulacija s autohtonim sojem R. leguminosarum bv. viciae OS–103 ostvaren je značajno veći prinos zrna u usporedbi s inokulacijom s referentnim sojem R. pisi DSM 30132. Na promatrane parametre značajno su utjecali kultivar vrtnog graška, inokulacija sjemena kvržičnim bakterijama i gnojidba dušikom, stoga su poželjna daljnja istraživanja s novim sojevima kvržičnih bakterija, novim kultivarima i u drugačijim agroekološkim uvjetima

Reaction of garden pea (Pisum sativum L.) to inoculation and nitrogen fertilization in Eastern Croatia