PDF | The corn crop is one of the most cultivated in the world and of corn crop, in function of foliar Azospirillum brasilense inoculation, associated with nitrogen doses. capacidade de expansão do grão em milho-pipoca. Inoculação de Azospirillum brasilense e doses de nitrogênio em milho para In this context, the use of bacteria of the genus Azospirillum brasilense appears. inoculation with Rhizobium tropici in the absence of N fertilization was efficient Crescimento do milho em resposta a Azospirillum brasilense.

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As for the grain yield, the addition of 1. The high cost of chemical fertilizers and concerns about more sustainable and less polluting agriculture have led to increasing interest in the use of inoculants containing bacteria that promote plant growth and enhance crop yield Hungria et al. The authors argued that the chlorophyll content responded to the increase in N because this nutrient participates directly in the biosynthesis of proteins and chlorophyll.

Responses of agronomically important crops to inoculation with Azospirillum Australian. In agreement with the present study, Ohland et al. Agronomy Journal, Madison, v.

Inoculations were applied in combination with cover doses of mineral N. The misuse of fertilizers has become a growing concern in terms of agricultural and environmental sustainability.

Inoculation with Azospirillum, associated with nitrogen fertilization in maize

In this case, it is possible to consider that the incorporation of higher amount of nitrogen fertilizer to soil, due to topdressing fertilization, has undermined azosppirillum effect of inoculation.

How to cite this article. In addition, nitrogen topdressing fertilization, associated with the use of inoculation, has reduced yield and the shoot dry biomass production.

The chemical characteristics of the cm soil layer prior to planting were: Environmental and physiological advances However, no statistically significant difference was observed after 60 days.

Cambridge, Cambridge University Press. It is observed that in the absence of nitrogen application in sowing the inoculation of Azospirillum spp.

Plant growth promoting bacteria are beneficial bacteria found in the rhizosphere, though they can also be found colonizing roots azospirkllum internal tissues.


The objective of this study was to evaluate the development and yield of maize in response to inoculation with Azospirillum associated with nitrogen fertilization. The highest yield was associated with the highest doses of nitrogen. Three inoculation levels were tested: The inoculation of seeds with Azospirillum prior to sowing resulted in increased mass. For grain yield, a diminished response of inoculation was observed in relation to the control treated with increasing N doses.

Studies have shown that Azospirillum stimulates the growth and yield of several plant species, many of which have great agronomic and ecological relevance Hungria et al.

The area was prepared by eliminating invasive plants through the application of 1, g ha -1 of glyphosate. According to Hungria et al. The capacity of these bacteria to fix nitrogen allows them to promote plant growth Hungria et al. The height of ear insertion and total plant height were not influenced by the factors under study.

The simple maize hybrid 30S31 Pioneer was sown on February 17th,using a mechanical seeder. To obtain the usable area, the two side lines and 0. However, the control treatment showed similar yield to the State means.

The effects of N doses were only significant for 1,grain weight and grain yield kg ha -1with seed inoculation providing a higher yield for second-harvest maize.

Bioscience Journal

Dalla Santa et al. Positive effect of inoculation was obtained in the absence of nitrogen in topdressing, with a higher production of shoot dry biomass and productivity in relation to treatment without inoculation.

Thus, the objective of this work was to evaluate the development and yield of maize in response to inoculation with Azospirillum spp. However, the results of the interaction between these bacteria and maize, in terms of agronomic potential, N fixation and growth promotion, depend on many biotic and environmental factors, including plant genotype, the microbiological community in the soil and nitrogen availability Roesch et al.

Data were collected from five plants along four central lines in a 20 m 2 working area within each plot.

Leaf chlorophyll content is used to predict the nutritional level of N in plants, and the content of this pigment is positively correlated with N content Piekielek et al. Inoculation with Azospirillumassociated with nitrogen fertilization in maize.


Inoculation of Azospirillum spp.

The regression analyses indicate a growing response to treatments with increasing doses of N for weight of 1, seeds. Increased leaf N content, found in this study, may have enhanced the effects of nitrogen in plant development, since the formation of grain in maize culture is closely related to the translocation of sugars Crawford et al. It was found that, both for shoot dry biomass and for yield, the inoculation with Azospirillum spp.

Maize Zea mays L. However, positive responses are not always obtained of increased production as a function of seed inoculation with Azospirillum spp. The application of nitrogen at sowing was made in furrow, and at topdressing, there was a broadcasting application at 35 days after plant emergence, at which time the plants had leaves. By the other hand, it is agreed that plant genotype is the key factor to obtain the benefits derived from biological nitrogen fixation, combined with the selection of efficient strains.

On the other hand, Dotto et al. Based on the mean moisture content of the sample, the dry biomass produced in each plot was calculated, then extrapolating to kg ha Services on Demand Journal. No significant difference was observed in chlorophyll content among treatments, at 30 days after sowing Table 4.

Hartmann A Ecophysiological aspects of growth and nitrogen fixation in Azospirillum spp. An increase in the dry biomass of both the shoots and roots of the plant caused by Azospirilum was also found by Dalla Santa et al.

Azospirillum brasilense – plant genotype interactions modify tomato response to bacterial diseases, and root and foliar microbial communities. Os efeitos das doses de N foram significativos apenaspara massa de 1. The shoot dry biomass azos;irillum significantly influenced by the interactions between nitrogen topdressing fertilization and inoculation, as well as between nitrogen fertilization of base and topdressing Table 2.