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Components of corn crop yield under inoculation with Azospirillum brasilense using integrated crop-livestock system/Componentes do rendimento da cultura do milho sob inoculacao de Azospirillum brasilense em sistema de integracao lavoura-pecuaria
The objective of this study was to evaluate the agronomic characteristics of corn seed inoculated with Azospirillum brasilense, grown on black oat and ryegrass straw, and managed under different grazing strategies and doses of nitrogen. The experiment was conducted in Santa Maria, Rio Grande do Sul...
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Published in: | Acta scientiarum. Agronomy 2016-10, Vol.38 (4), p.485 |
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Main Authors: | , , , , |
Format: | Article |
Language: | Spanish |
Online Access: | Get full text |
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Summary: | The objective of this study was to evaluate the agronomic characteristics of corn seed inoculated with Azospirillum brasilense, grown on black oat and ryegrass straw, and managed under different grazing strategies and doses of nitrogen. The experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, during two agricultural seasons (2012/2013 and 2013/2014) in a randomized, complete block design with three replications. In the winter period, black oat and ryegrass straw were managed at different grazing heights by sheep (0.30, 0.20, 0.10 m, conventional grazing, and no grazing) with three doses of nitrogen (0, 50, and 100 kg [ha.sup.-1], with or without inoculation by A. brasilense). We used the hybrid Pioneer (P1630H[R]) in 2012 and the hybrid Agroeste (AS 1551[R]) in 2013. The height of corn plants was greater when they were grown on black oat and ryegrass straw, and the absence of grazing favored productivity. Under drought conditions, the application of nitrogen to the pasture favored corn development, increasing plant height, ear height, and stem diameter. Inoculation with A. brasilense had a positive effect on the characteristics of yield and productivity of corn, independent of growing season and hybrid used. Keywords: Zea mays, grazing heights, biological nitrogen fixation, nitrogen, integrated systems. Objetivou-se, com este trabalho, avaliar as caracteristicas agronomicas da cultura do milho sob inoculacao de sementes com A. brasilense, cultivado sobre palhada de aveia-preta e azevem manejada com diferentes manejos de pastejo e doses de nitrogenio. O experimento foi conduzido em Santa Maria, Brasil, em dois anos agricolas (2012/2013 e 2013/2014), em delineamento experimental de blocos casualizados, com tres repeticoes. No periodo hibernal a pastagem de aveia preta e azevem foi manejada em diferentes alturas de pastejo (0,30, 0,20, 0,10 m, pastejo convencional e sem pastejo) por ovinos, tres doses de N (0, 50 e 100 kg [ha.sup.-1], com ou sem inoculacao de A. brasilense). Foi utilizado o hibrido Pioneer (P1630H[R]) em 2012 e o hibrido Agroeste (AS 1551[R]) em 2013. A altura das plantas de milho e beneficiada quando e cultivado sobre palhada de aveia preta e azevem na ausencia de pastejo, favorecendo tambem a produtividade. Sob deficit hidrico o nitrogenio aplicado na pastagem favorece o desenvolvimento do milho, aumentando altura da planta e de insercao de espiga e diametro de colmo. A inoculacao com A. brasilense tem efeito positivo s |
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ISSN: | 1679-9275 |
DOI: | 10.4025/actasciagron.v38i4.30664 |