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. For grain yield, a diminished response of inoculation was observed in relation to the control treated with increasing N doses. However, positive responses are not always obtained of increased production as a function of seed inoculation with Azospirillum spp. Plant and SoilAmsterdam, v. On the other hand, Dotto et al.
Several authors have reported the positive effects of the interaction between Azospirillum spp. Responses of agronomically important crops to inoculation with Azospirillum Australian. 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.
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. The inoculation of seeds with Azospirillum prior to sowing resulted in increased mass. On average, both the seed and leaf-spray inoculated treatments showed longer ear lengths, in comparison with the non-inoculated control.
These bacteria improve conditions for development of root system as they synthesize phytohormones, allowing absorption of more water and nutrients, as well as providing more tolerance against drought and salinity stresses Bashan et al. Lavras, Universidade Federal de Lavras. 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.
To obtain the usable area, the two sm lines and 0. Quadrosin an experiment under tillage with the intent to assess the inoculation of maize genotypes with Azospirillum spp. All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License.
However, the control treatment showed similar yield to the State means.
Milgo significant difference was observed in chlorophyll content among treatments, at 30 days after sowing Table 4. 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.
Inoculations were applied in combination with cover doses of mineral N. Russian Journal of Plant Physiology, However, it still presents a significant yield increase Figure 3.
Maize Zea mays L. 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.
One alternative to reduce the impact of chemical fertilizers is the use azoepirillum inoculants containing nitrogen-fixing and plant growth promoting bacteria. I Agronomist Engineer, Doctor Science. Results for such interactions are shown in Table 5. Agronomy Journal, Madison, v. Crop Science Efficiency of inoculant with Azospirillum brasilense on the growth and yield of second-harvest maize 1.
The effects of N fertilization are only visible in relation to 1,grain weight and grain yield kg ha -1and seed inoculations provide a higher yield in second-harvest maize. The highest grain yields were obtained with increasing N doses.
Throughout the experiment, the mean monthly rainfall was monitored on a daily basis Figure 1. Cambridge, Cambridge University Press.
Inoculation with Azospirillum, associated with nitrogen fertilization in maize
Use of a chlorophyll meter at the early dent stage of corn to evaluate N sufficiency. Two experiments were conducted in the field on the summer harvest. The height of ear insertion and total plant height were not influenced by the factors under study. Leaf N content was determined using the method described by Tedesco 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.
Fertilization with phosphorus and potassium was carried out in the planting furrow according to the chemical analysis of soils.
There was no statistical difference in this stage of development for doses of mineral N at 60 days. Hartmann A Ecophysiological aspects of growth and nitrogen fixation in Azospirillum spp. Applied and Environmental Microbiology, It is categorized as hot and humid AWwith rainy summers and dry winters.
The biological nitrogen fixation is an alternative to supply the nitrogen needed for maize. 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.
Biomass was determined in leaves, stalks and ears collected from a linear meter of each plot. Increases in the production of shoot dry biomass and yield provided by inoculation in this azkspirillum could be attributed to the stimulus that A.
The initial increase in the stem diameter of plants subjected to inoculation may be associated with the production of phytohormones Moreira et al. On the economy of plant form and function. The regression analyses generated a linear fit for both traits, with different functions depending on the inoculation treatment Figures 3a and 3b. It is observed that in the absence of nitrogen application in sowing the inoculation of Azospirillum spp.
Azospirillum brasilense – plant genotype interactions modify tomato response to bacterial diseases, and root and foliar microbial communities. For example, according to Azosporillum et al. No significant impacts on ear size were observed for different N doses, independently of the treatment.