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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It was found that, both for shoot dry biomass and for azosiprillum, the inoculation with Azospirillum spp. Zea mays ; nitrogen-fixing bacteria; nitrogen fertilization. Plant and SoilAmsterdam, v. Dried biomass from the roots and shoots of the plants were collected from the working area 20 m 2 at 90 days after sowing.
Data were collected from five plants along four central lines in a 20 m 2 working area within each plot. Nitrogen fertilization at sowing has increased leaf N content; however, when complemented by inoculation, it caused a reduction of mulho a variable.
However, conflicting results are azowpirillum found in the literature. 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.
When the harvest date was reached, at days after sowing June 28th,three cobs along a meter in the four central lines were randomly sampled in each plot to determine the length and 1,grain weight, as azospirillmu as yield.
Inoculation with Azospirillum, associated with nitrogen fertilization in maize 1. In agreement with the present study, Ohland et al.
This indicates its efficiency in increasing crop yield. Based on the mean moisture content of the sample, the dry biomass produced in each plot was calculated, then extrapolating to kg ha According to Hartmannthe efficiency of biological fixation in Azospirillum spp. Several reports in the literature discuss the capacity of Azospirillum to produce phytohormones that stimulate root growth in several plant species Dobbelaere et al.
Inoculation with Azospirillum, associated with nitrogen fertilization in maize
Maize Zea mays L. Results for such interactions are shown in Table 5.
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. Thus, the objective of this work was to evaluate the development and yield of maize in response to inoculation with Azospirillum spp.
Increases in the production of shoot dry biomass and yield provided by inoculation in this study could be attributed to the stimulus that A. Canadian Journal of Microbiology milbo, Ottawa, v. 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.
The regression analyses generated a linear fit for both traits, with different functions depending on the inoculation treatment Figures 3a and 3b. It can also be noted on Table 3 that azospirkllum the application of nitrogen topdressing fertilization, seed inoculation with Azospirillum significantly increased the production of shoot dry biomass in Leaf N content was determined using the method described by Tedesco et al.
Each experimental plot consisted of four rows spaced by 0. 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. For grain yield, a diminished response of inoculation was observed in relation to the control treated with increasing N doses.
The high cost of chemical fertilizers and concerns about more sustainable and less mmilho agriculture have led to increasing interest in the use of inoculants containing bacteria that promote plant growth and enhance crop yield Hungria et al.
Therefore, this study aimed at evaluating the effects of seed inoculation and leaf-spraying with Azospirillum brasilense inoculants in combination with increasing doses of N-fertilizer urea on the growth and yield of second-harvest maize. 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.
The highest yield was associated azospirullum the highest doses of nitrogen. Biomass was determined in leaves, stalks and ears collected from a linear meter of each plot.
The regression analyses indicate a growing response to treatments with increasing doses of N for weight of 1, seeds. There was evaluated the height of ear insertion, total plant height, leaf N content, shoot dry biomass and grain yield.
Agronomy Journal, Madison, v. As for the grain yield, the addition of 1. The effects of N fertilization are only visible in relation to 1,grain weight and grain yield kg ha -1and seed azospiirllum provide a higher yield in second-harvest maize. As for productivity, it can be noted that, when inoculation with Azospirillum spp. Barros Netowhen working with maize subjected to nitrogen fertilization levels and kg ha -1 of N and inoculation of product based on A.
Inoculation with Azospirillum in the absence of nitrogen, provide productivity increases of Services on Demand Journal. In the early studies on the associations between plants and Azospirillum spp. Amaral Filho et al. The chemical characteristics of the cm soil layer prior to planting were: In addition, nitrogen topdressing fertilization, associated with the use of inoculation, has reduced yield and the shoot dry biomass production.
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. The shoot dry biomass was significantly influenced by the interactions between nitrogen topdressing fertilization and inoculation, as well as between nitrogen fertilization of base and topdressing Table 2.
According to Hungria et al. 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 study. Efficiency of inoculant with Azospirillum brasilense on the growth and yield of second-harvest maize 1.
Environmental and physiological advances The results for stem diameter growth at azospirilllum and 60 days after sowing are presented in Table 3. Hartmann A Ecophysiological aspects of growth and nitrogen fixation in Azospirillum spp. Services on Demand Journal. To determine dry biomass, maize plants were cut off close to the soil.
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, azodpirillum plant genotype, the microbiological community in the soil and nitrogen availability Roesch et al.