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     Due to its high economical importance and the need of high amounts of nitrogen fertilizer, the corn crop demands further and deeper studies on biological nitrogen fixation trough bacterium  Azospirillum brasilense.  Therefore, this study aimed at assessing influence of inoculation of three different genotypes (Orion, A1 Bandeirante and AG-1051) with such bacterium in association with cover application of five different nitrogen doses on percentage oil content in the grains. Data were subjected to ANOVA and means compared by Tukey test at 5%. The inoculation of  A. brasilense , with or without nitrogen fertilization, has promoted oil content increase in the grains. Orion genotype presented the greatest increase with the bacterium inoculation, as well as it was the most productive at the lowest nitrogen dosages assessed. High temperatures favored the increase in the oil content in the grains.Keywords:   Zea mays , inoculation, biological fixation, oilEFEITOS DA INOCULACAO COM A zospirillum brasilense  E DOSE DE NITROGENIO SOBRE O TEOR DE OLEO DE MILHORESUMO   Devido a sua grande importância economica e necessidade de fertilizantes nitrogenados, a cultura do milho exige estudos mais aprofundados sobre a fixacao biologica do nitrogenio pela bacteria  Azospirillum brasilense . Portanto, este estudo teve como objetivo avaliar a influencia da inoculacao de tres diferentes genotipos (Orion, A1 Bandeirante e AG-1051) com essa bacteria em associacao com a aplicacao de cinco diferentes doses de nitrogenio no teor percentual de oleo nos graos. Os dados foram submetidos a ANOVA e as medias comparadas pelo teste de Tukey a 5%. A inoculacao de  A. brasilense , com ou sem adubacao nitrogenada, promoveu aumento do teor de oleo nos graos. O genotipo Orion apresentou o maior aumento com a inoculacao da bacteria, bem como o mais produtivo nas menores dosagens de nitrogenio avaliadas. As temperaturas altas favorecem ou aumentam o teor de oleo nos graos.Palavras-chave:   Zea mays , inoculacao, fixacao biologica, oleo

EFFECTS OF SEED INOCULATION WITH Azospirillum brasilense AND NITROGEN DOSE ON OIL CONTENT OF CORN GRAINS