Utjecaj benefitnih mikroorganizama na prinos i kvalitetu soje u uvjetima smanjene gnojidbe dušikom

The aim of this study was to investigate the possibility to reduce the application of mineral nitrogen fertilizers through the application of beneficial microorganisms (genus Bradyrhizobium, Azotobacter, bacteria Pseudomonas fluorescens, Bacillus spp., etc.). Research was conducted during 2013 and 2014 on Eutric brown soil. The experiment was set up in a split-block scheme with 12 different variants in 4 repetitions: two soybean cultivars were used; two different treatments of nitrogen fertilizers and three different treatments of microbiological preparation were applied. Analysed parameters were soybean grain yield (kg/ha) based on 13% moisture, protein content (%), oil content (%) and hectolitre mass (kg). Given that the climatic conditions in the second year of research were more favourable than in the first year of research, all the elements of research, including control variants, achieved better results in the second year of research. All variants treated with microbiological preparations, either by application in soil or by application in soil combined with foliar treatments, also achieved statistically significant differences compared to the control variants.U radu je istraživana mogućnost redukcije dušičnih gnojiva uz korištenje benefitnih mikroorganizama (rodovi Bradyrhizobium, Azotobacter, bacterija Pseudomonas fluorescens, Bacillus spp., itd.), kao alternative dušičnim gnojivima. Istraživanja su provedena tijekom 2013. i 2014. godine na eutrično smeđem tlu. Pokus je postavljen prema split-blok shemi te sadrži 12 varijanti u 4 ponavljanja kako slijedi: dvije sorte soje, dvije varijante primjene mineralnoga dušičnoga gnojiva i tri varijante primjene mikrobiološkoga preparata. Elementi istraživanja bili su prinos zrna (kg/ha), preračunat po hektaru na osnovi 13% vode u zrnu; sadržaj proteina (%); sadržaj ulja (%) i hektolitarska masa (kg). S obzirom na to da su klimatske prilike u drugoj godini istraživanja bile povoljnije nego u prvoj istraživačkoj godini, svi elementi istraživanja, uključujući kontrolne varijante, druge godine istraživanja, postigli su bolje rezultate. Sve varijante tretirane mikrobiološkim preparatima, bilo aplikacijom u tlo ili aplikacijom u tlo uz folijarne tretmane, također su postigli statistički vrlo značajno bolje rezultate u odnosu na kontrolne varijante