<b>Components of corn crop yield under inoculation with <i>Azospirillum brasilense</i> using integrated crop-livestock system

Abstract

ABSTRACT. 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 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.

Cultivo De Milho Em Sistema De Plantio Direto Em Pastagem Inoculada Com Azospirillum Brasilense

“…As espigas de milho apresentaram comprimento de espigas em média de 18, 58 cm. Apesar de autores (Andrade et al, 2016;Brum et al, 2016) mencionarem a influência da inoculação com A. brasilense no crescimento e desenvolvimento das plantas de milho, devido a capacidade dessas em estimularem a produção de hormônios, o residual dessa inoculação não apresentou efeito sobre a altura e diâmetro das plantas de milho 30 dias após a germinação.…”

“…Entre os efeitos negativos causados pelo uso de fertilizantes químicos nitrogenados, Brum et al (2016) e Kaneko et al (2016) citam o excesso de nitrato nos mananciais. Como alternativa para a redução de custos e minimização dos impactos ambientais causados pela inserção de fertilizantes nitrogenados ao solo tem-se a Fixação biológica de nitrogênio -FBN.…”

Agronomic performance and sweet corn quality as a function of inoculant doses (Azospirillum brasilense) and nitrogen fertilization management in summer harvest

“…Otherwise, the application of Azospirillum brasilense has been useful for promoting plant growth (Piccinin et al 2015;Spolaor et al 2016). Many studies indicate the seed inoculation with A. brasilense in conjunction with nitrogen fertilizer for improving the vegetative traits of sweet corn, thereby increasing the crop yield (Hungria et al 2010;Braccini et al 2012;Brum et al 2016). The method stimulates the seed germination and accelerates the seedling growth under field conditions (Cassán et al 2009).…”

Nitrogen fertilization and inoculation with diazotrophic bacteria in corn intercropped with xaraés grass

“…In this scenario, new technologies must be sought to reduce the use of nonrenewable sources in the production of industrial fertilizers and to obtain the highest corn crop productivity, concurrently with reducing the production costs and the emission of greenhouse gases. The use of diazotrophic bacteria has proved to promote significant improvement in the production of cereals in different production systems, either by seed inoculation or leaf spraying (Sala et al, 2008;Hungria et al, 2010;Araújo et al, 2014;Brum et al, 2016;Fukami et al, 2016).…”

“…Several diazotrophic bacteria have been isolated in corn crop, and the most studied species so far belong to the genus Azospirillum and Herbaspirillum (Araújo et al, 2016;Brusamarello-Santos et al, 2017;Martins et al, 2017). These species perform atmospheric nitrogen fixation and grow associated with the rhizosphere of corn through symbiosis, thus contributing to nitrogen nutrition (Figueiredo et al, 2009) and promoting plant growth through the production of hormones (Novakowiski et al, 2011) such as auxins and gibberellins.…”