Objetivo desse trabalho foi avaliar o desempenho da soja em nodulação e crescimento radicular sob diferentes níveis de dosagem em inoculação e coinoculação. Foi conduzido em Delineamento em blocos casualizados, em esquema fatorial 4x16. As dosagens utilizadas foram 50-100-150ml (25kg de semente) com Azospirillum brasilense e 450-900-1350ml por ha de Bradyrhizobium japonicum. Os resultados das análises da parte aérea e radicular das plantas foram comparados pelo teste de Tukey (significância de 5%). A inoculação com Bradyrhizobium japonicum apresentou resultados superiores em todos os aspectos avaliados quando comparadas a o tratamento zero, já a inoculação com Azospirillum brasilense não demonstrou resultados significativos em nenhum aspecto isoladamente. Com a co-inoculação mostrou que a interação das duas estirpes apresentou resultado superior, na matéria verde raiz e matéria seca parte aérea, significando um melhor desenvolvimento vegetativo da planta
Corn is highly demanding in nitrogen, but this is an onerous element, and it is necessary to seek greater efficiency in its use in this crop. This research aimed to analyze the development of this crop using nitrogen fertilization and inoculation of Azospirillum brasilense. The experiment was conducted in a randomized block design in a 2 x 5 factorial scheme, the first factor being the inoculation of Azospirillum and the second factor the nitrogen doses (0, 50, 100, 150 and 200 kg of N.ha-1) . The interaction between the inoculant and the nitrogen fertilization showed significance in the variables plant height and stem diameter. Correct nitrogen administration is essential for maize, and application in conjunction with the inoculation of Azospirillum significantly increases yields and may be an alternative to more environmentally and economically sustainable production.
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