Corn plant as affected by beneficial microorganisms
Adriano Stephan Nascente1, Dennis Ricardo Cabral Cruz2, Mariana Aguiar Silva2
1Brazilian Agricultural Research Corporation (EMBRAPA), Rice and Beans, Brazil
The corn (Zea mays L.) is a species widely used and appreciated in human and animal nutrition. The conventional production systems of corn are characterised by being dependent, mainly on large amounts of nitrogen fertilisers, in addition to the excessive use of other nutrients and pesticides that generate negative financial and environmental impacts. An alternative to reduce synthetic inputs in corn crop would be the use of bacteria and other microorganisms that inhabit the rhizospheric region, close to the root, which act as plant growth promoters based on symbiotic relationships. These microorganisms can contribute to better absorption of soil nutrients by plants, in addition to their better development, contributing to a reduction in the need for fertilisers and pesticides. The objective was to determine the effects of multifunctional microorganisms, alone or in combination, on shoot, root and total biomass production, gas exchange, macronutrient content, production components and grain productivity of corn plants. The experiment was carried out in a greenhouse in a completely randomised design, with four replications. Twenty-six treatments consisted of isolated or combined microbiolisation of corn seeds with the rhizobacteria BRM 32109, BRM 32110 and BRM 63573 (Bacillus sp.), BRM 32111 and BRM 32112 (Burkholderia sp.), BRM 32113 and BRM 32114 (Serratia marcenses), Ab-V5 (Azospirillum brasilense) and BRM 63574, BRM 63574 (Azospirillum sp.), a T-26 fungus isolate (Trichoderma koningiopsis) and a control treatment (without the application of microorganisms). At seven and 21 days, two more applications of the same treatments were carried out, in the soil and in the plants, respectively. The microorganisms applied alone or in combination promoted significant increases of 49% in maize plant biomass, 30% in gas exchange, 36% in macronutrient content and 33% in productivity. Isolates BRM 32114, Ab-V5, BRM 32110 and BRM 32112 and the combinations BRM 32114 + T-26, BRM 63573 + Ab-V5 and 32114 + BRM 32110 promoted better benefits to corn, allowing us to infer that the use of beneficial microorganisms significantly affect the development of corn plants.
Keywords: Co-inoculation, fungus, productivity, rhizobacteria, Zea mays
Contact Address: Adriano Stephan Nascente, Brazilian Agricultural Research Corporation (EMBRAPA), Rice and Beans, P.O. Box 179, Highway 462, km 12, 75375000 Santo Antônio de Goiás, Brazil, e-mail: adriano.nascenteembrapa.br