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Co-inoculation of Azospirillum brasilense and Herbaspirillum seropedicae in maize/Co-inoculacao de Azospirillum brasilense e Herbaspirilum seropediceae na cultura do milho

Bacteria from the genera Azospirillum and Herbaspirillum have been associated with increments in maize yield. The aim of this study was to evaluate the maize yield and nutritional content in response to inoculation with A. brasilense and H. seropediceae in association with nitrogen (N) fertilization...

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Published in:Revista brasileira de engenharia agrĂ­cola e ambiental 2016-06, p.545
Main Authors: Dartora, Janaina, Marini, Deniele, Goncalves, Edilaine. D.V, Guimaraes, Vandeir F
Format: Article
Language:Spanish
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Summary:Bacteria from the genera Azospirillum and Herbaspirillum have been associated with increments in maize yield. The aim of this study was to evaluate the maize yield and nutritional content in response to inoculation with A. brasilense and H. seropediceae in association with nitrogen (N) fertilization. The experimental design was randomized blocks in a 4 x 5 factorial scheme, with four replicates. The treatments consisted of seed inoculation (control without N and inoculation, A. brasilense strain--AbV5, H. seropediceae strain SMR1 and co-inoculation AbV5 + SMR1) and N doses (0, 40, 80, 120 and 160 kg [ha.sup.- 1]). The following variables were evaluated: ear insertion height, ear length, ear diameter, number of rows per ear, number of grains per row, ear weight, yield and NPK contents in leaves and grains. There was no interaction between the factors studied. Co-inoculation with the strains promoted increments of 12% in leaf P content, compared with control, and N fertilization promoted increase in yield and leaf P content up to the maximum dose studied. Key words: Zea mays L. growth-promoting bacteria phytohormones Bacterias dos generos Azospirillum e Herbaspirillum tem sido associadas a obtencao de incrementos na produtividade do milho. O objetivo deste estudo foi avaliar a produtividade e o teor nutricional do milho em resposta a inoculacao de A. brasilense e H. seropedicae em associacao com a adubacao nitrogenada. O experimento foi conduzido em delineamento experimental de blocos ao acaso em esquema fatorial 4 x 5 com quatro repeticoes. Os tratamentos foram constituidos da inoculacao de sementes (controle--sem N e sem inoculacao, estirpe de A. brasilense--AbV5, estirpe de H. seropedicae--SmR1 e coinoculacao AbV5 + SmR1) e doses de N (0, 40, 80, 120 e 160 kg [ha.sup.-1] N). Foram avaliados: altura de insercao da espiga, comprimento e diametro da espiga, numero de fileiras por espiga e de graos por fileira, massa de espiga, produtividade e teores de NPK em folhas e graos. Nao houve interacao entre os fatores em estudo. A coinoculacao de estirpes proporcionou incremento de 12% no teor de P foliar em relacao ao controle e a adubacao nitrogenada proporcionou incremento na produtividade e teor de P foliar ate a maxima dose estudada. Palavras-chave: Zea mays L. bacterias promotoras do crescimento fito-hormonios
ISSN:1415-4366
DOI:10.1590/1807-1929/agriambi.v20n6p545-550