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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Significant effect was observed with respect to inoculation with Azospirillum brasilense. On the other hand, Dotto et al. However, there were significant differences among control and inoculation treatments Table 4. According to Hartmannthe efficiency of biological fixation in Azospirillum spp.
Plant and Azospirilluk, Plant and SoilAmsterdam, v. 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. There was evaluated the height of ear insertion, total plant height, leaf N content, shoot dry biomass and grain yield.
The highest yield was associated with the dm doses of nitrogen. 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. Several authors have reported the positive effects of the interaction between Azospirillum spp.
I Aozspirillum Engineer, Doctor Science.
Agronomy Journal, Madison, v. Seed inoculation with Azospirillum brasilenseassociated with the use of bioregulators in maize. The regression analyses generated a linear fit for both traits, with different functions depending on the inoculation treatment Figures 3a and 3b. Two experiments were conducted in the field on the summer harvest. Based on the mean moisture content of the sample, the dry biomass produced in each plot was calculated, then extrapolating to kg ha Canadian Journal of Microbiology, Inoculation of Azospirillum spp.
In both seasons, the ear insertion height and total plant height were not affected by the factors under study.
Inoculation with Azospirillum, associated with nitrogen fertilization in maize
The area was prepared by eliminating invasive plants through the application of 1, g ha -1 of glyphosate. Potencialidad de Azospirillum en optimizar el crecimiento vegetal bajo condiciones adversas. Centro Nacional de Pesquisa de Solos. 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 parameters assessed included: The results for stem diameter growth at 30 and 60 days after sowing are presented in Table 3. In agreement with the present study, Ohland et al. The experimental plots consisted of 12 lines 12 m long, with 0. For grain yield, a diminished response of inoculation was observed in relation to the control treated with increasing N doses.
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. The application of nitrogen, in topdressing or sowing, has positively influenced shoot dry biomass, as well as productivity, and base nitrogen fertilization has also provided an increase in leaf N content of plants Table 5. Throughout the experiment, the mean monthly rainfall was monitored on a daily basis Figure 1.
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License. This study aimed at evaluating the effects of an inoculant with Azospirillum brasilense on the growth and yield of secondharvest maize. Plant height and ear insertion height were not modified by N fertilization and inoculation at both sites Table 2which can be attributed to genetic characteristics of each hybrid, a result also found by Campos et al.
It is observed that in the absence of nitrogen application in sowing the inoculation of Azospirillum spp. Amaral Filho et al. Comunicata ScientiaeTeresina, v.
In addition, nitrogen topdressing fertilization, associated with the use of inoculation, has reduced yield and the shoot dry biomass production.
An increase in the dry biomass of both the shoots and azspirillum of the plant caused by Azospirilum was also found by Dalla Santa et al. Within this group, the genus Azospirillum stands out.
Plant heights cm at 30 and 60 days after sowing are shown in Table 1.
However, no statistically significant difference was observed after 60 days. Fertilization with phosphorus and potassium was carried out in the planting furrow according to the chemical analysis of soils.
Furthermore, for every kg of N-fertilizer, there was an 8.
It is azopirillum as hot and humid AWwith rainy summers and dry winters. In the same way, Quadros have found increases of up to kg ha -1 on the yield of dry weight of maize shoots, when seeds were inoculated with A. Barros Netowhen working with maize subjected to nitrogen fertilization levels and kg ha -1 of N and inoculation of product based on A. Zea mays ; nitrogen-fixing bacteria; nitrogen fertilization.
The dataset was subjected to an analysis of variance using the Biostat 5. Brazilian Archives of Biology and TechnologyCuritiba, v. Despite this increase in relation mllho 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.
Plant growth promoting bacteria are beneficial bacteria found in the rhizosphere, though they can also be found colonizing roots and internal tissues.
Therefore, biological nitrogen fixation is an alternative to supply part of the nitrogen needed for maize culture. Such changes in the e, system are related to the production of growth enhancing substances by bacteria, since plant growth regulators phytohormonesmainly the indole acetic acid IAAexcreted by Azospirillum spp.
Efficiency of inoculant with Azospirillum brasilense on the growth and yield of second-harvest maize 1. This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.