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RESUMO - A inoculacao das sementes com Azospirillum spp. e uma pratica que tem sido rotineiramente realizada no milho, sobretudo via formulacao liquida. Todavia, as respostas relativas a outros modos de inoculacao com diferentes formulacoes sao, ainda, pouco conhecidas. Desta forma, objetivou-se com este trabalho avaliar a eficiencia agronomica de doses de A. brasilense em formulacao polimerica em po, aplicada diretamente na caixa semeadora, sobre os componentes da produtividade do milho. Para tanto, foi conduzido um ensaio em blocos casualisados, com quatro repeticoes. Os tratamentos consistiram de uma testemunha, dose total de N, ½ dose de N; ½ dose de N + inoculacao comercial padrao e ½ dose de N + quatro doses de inoculante em po (1, 2, 4 e 8 g kg-1), aplicado na caixa semeadora. Foram avaliados os caracteres produtividade, numeros de fileira por espiga e de graos por fileira, massa de mil graos, materia seca da parte aerea e teores de N nos graos e na parte aerea. Nas condicoes testadas, a dose de 2 g kg-1 de sementes do inoculante, quando associada a adubacao nitrogenada de 90 kg ha-1, apresentou superioridade no rendimento da cultura, ultrapassando, inclusive, a inoculacao comercial com produto liquido. Palavras-chave: Zea mays, fixacao biologica, inoculante, rendimento. MAIZE YIELD IN RESPONSE TO THE APLICATION OF Azospirillum spp.  INTO THE SEED TANK ABSTRACT - Seed inoculation with Azospirillum spp . is a practice that has been routinely carried out in maize crop, especially via liquid formulation. However, responses concerning other methods of inoculation of different formulations are still poorly understood. The objective of this work was to evaluate the agronomic efficiency of the application of powder formulation of Azospirillum brasilense directly into the sowing box. For this purpose, a randomized block trial with 4 replications was carried out. The treatments tested consisted of absence of N fertilizer, the full N recommendation and a combination of the half of recommended N associated with the inoculation of four doses of A. brasilense (1, 2, 4 and 8 g kg-1) in powder formulation. The following variables were evaluated: number of kernel per row, number of row per ear, shoot dry biomass, thousand seed weight, grain N content, shoot N content and grain yield. All treatments submitted to inoculation with the powder formulation showed higher yields than the treatment in which the total dose of N was applied. However, superior results were obtained for the treatment in which ½ dose of N was associated with the powder inoculant in the proportion of 2 g kg-1 of seed. Keywords: Zea mays , biological fixation, inoculant, productivity.

PRODUTIVIDADE DO MILHO COM A APLICAÇÃO DE Azospirillum spp. DIRETAMENTE NA CAIXA SEMEADORA