Efeito da Azospirillum brasilense na Produtividade de Milho no Sudoeste Goiano

Abstract

The objective of this study was to evaluate the performance of hybrid maize inoculated with Azospirillum brasilense under different levels of topdressing nitrogen. The experiment was conducted under field conditions in the conventional tillage system, in the experimental station of the Federal Institute Goiano (Rio Verde, GO), in the 2012 crop season. The parameters evaluated were: ear mass; cob mass; ear length, ear diameter, ear grain weight and total weight per plot. The experimental design was randomized blocks with four replications. The treatments were arranged in a factorial arrangement 1 x 2 x 5, with one hybrid (DKB 390 YG RR2), absence and presence of inoculation with A. brasilense and five doses of N (0, 25, 50, 75 and 100%) totaling 40 plots and 640 m2. The experimental data were subjected to analysis of variance by test F, and when significant the means were compared by Tukey test at 5% probability. The optimal dose of nitrogen applied at top dress in the maize inoculated was approximately 89% of the recommended dose, which may range up to 84% without significant loss in yield or in the effect of A. brasilense.

Azospirillum brasilense promotes increment in corn production

“…Grain productivity g kg ha (2010) report that a higher contribution of inoculation associated to nitrogen fertilization is generally noticed. Nevertheless, there are many papers performed in Brazil in regions with similar climate to the present study (Kappes et al, 2013, Cunha et al, 2014 and regions with different climate (Cavallet et al, 2000;Repke et al, 2013;Marini et al, 2015) showing absence of significant results for the interaction between seed inoculation with A. brasilense and N doses for the ear length. According to Basi (2013) it is essential that field experiments be performed to evaluate the effects of inoculation with A. brasilense in order to obtain more results of this technology in corn crop in different conditions of year, climate and soil.…”

Resposta da inoculação com Azospirillum brasilense nas culturas de trigo e de milho safrinha

“…Somente foram observadas diferenças na variável altura de plantas, onde os tratamentos T1, T4, T5 e T6 apresentaram comportamento similar porém superiores aos demais tratamentos. Estudando o efeito da inoculação de sementes de milho com a bactéria Azospirillum brasilense, Cunha et al (2014) não obtiveram resposta em parâmetros como diâmetro de colmo, altura de inserção da espiga, em altura de planta, índice de área foliar, o que também pode ser observado com boa parte dos resultados encontrados no presente estudo. *Valores seguidos de mesma letra pertencem ao mesmo agrupamento, pelo teste de Scott-Knott, a 5% de probabilidade de erro.…”

Maize growth in response to Azospirillum brasilense, Rhizobium tropici, molybdenum and nitrogen

“…Seed inoculation with rhizobacteria, such as Azospirillum brasilense and Rhizobium tropici, can be an option to reduce the applied quantity and/or potentiate the effect of N fertilizers in the maize crop, since they are diazotrophic and thus can complement the quantity of the nutrient required by the plants via biological fixation of the atmospheric N (BNF). In addition, another benefit of these rhizobacteria is the action as plant-growth promoters (PGPR) through various mechanisms such as phosphate solubilization, production of phytohormones, siderophores, biocontrol of pathogens and pest insects (Carvalho et al, 2009;Hungria et al, 2010;Araújo et al, 2012).…”