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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These results exceed those obtained by Cavallet milhl al. Quadrosin an experiment under tillage with the intent to assess the inoculation of maize genotypes with Azospirillum spp.

The results for stem diameter growth at 30 and 60 days after sowing are presented in Table 3. The simple maize hybrid 30S31 Pioneer was sown on February 17th,using a mechanical seeder.

Yield was obtained using a mechanical strip, and grain weight was derived from the ears collected from the useful plot areas. It is possible to observe a greater abundance and longer root lengths in the treatments inoculated with strains of Azospirillum brasiliense Figure 2.

Pauletti V Ureia no milho: Zzospirillum were collected from five plants along four central lines in a 20 m 2 working area within each plot.

Zea mays ; nitrogen-fixing bacteria; nitrogen fertilization. Plant and Soil, 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.

Bioscience Journal

The lack of response to leaf-spray inoculation may be related to the fact that this treatment was only applied 20 days after sowing. Despite the increase provided by the inoculation, yield values obtained in this experiment were lower azospirillm the productivity of hybrid BR which is kg ha -1 for a population of 55, plants per hectare. Maize Zea mays L. Mean cob length cm was determined using a ruler to measure from the cob base to its tip.

Plant and SoilAmsterdam, v. Comunicata ScientiaeTeresina, v. The contribution of biological nitrogen fixation in grasses or food products, such as maize and wheat, in fertilization programs is an issue that needs further azosiprillum.

Each experimental plot consisted of four rows spaced by 0. Trait Seeds Leaf-spray Control Shoot biomass g 1, Thus, the objective of this work was to evaluate the development and yield of maize in response to inoculation with Azospirillum spp.

Inoculation with Azospirillum, associated with nitrogen fertilization in maize

Azospirilum inoculation increases maize height and stem diameter, chlorophyll content and dry biomass weight for the shoot and root system, as well as 1,grain weight, ear length and grain yield, when the maize is inoculated via seed or leaf. Despite this increase in relation to control, the yield values obtained in this experiment are inferior to kg ha -1 estimated for the hybrid AG YG for a population of 55 to 60 thousand plants per hectare. In both seasons, the ear insertion height and en plant height were not affected by the factors under study.

Barros Netowhen working with maize subjected to nitrogen fertilization levels and kg ha -1 of N and inoculation of product based on A. However, no statistically significant difference was observed after 60 days.

For example, according to Moreira et al. This process of control and regulation of nitrogenase complex activity by modulator environmental factors concentration of assimilated nitrogen and oxygen becomes necessary due to the high demand for energy involved in the process of reducing atmospheric nitrogen N 2 by diazotrophic organisms, some 28 moles of ATP per mole of ammonia produced Azos;irillum et al.

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 the effect of inoculation. Several reports in the literature discuss the capacity of Azospirillum to produce phytohormones that stimulate root growth in several plant species Dobbelaere et al. The parameters assessed included: As for productivity, it can be noted that, when inoculation with Azospirillum spp.

Brazilian Archives of Biology and TechnologyCuritiba, v. Two experiments were conducted in the field on the summer harvest. For the experiment carried out in Cascavel, there was significant interaction among inoculation, N application at sowing and in topdressing for the variables yield, shoot dry biomass and leaf N content Table 2.

One alternative to reduce the impact of chemical fertilizers is the use of inoculants containing nitrogen-fixing and plant growth promoting bacteria.

For grain yield, a diminished response of inoculation was observed in relation to the control treated with increasing N doses. On the other hand, Dotto et al.