Navegando por Autor "Alves, Alex João"

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    Influência de Bacillus spp. nos atributos químicos e microbiológicos do solo e no desenvolvimento da soja e do milho
    (Universidade Estadual do Norte do Paraná, 2018-09-27) Alves, Alex João; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449; Lescano, Luis Eduardo Azevedo Marques; https://orcid.org/0000-0003-0874-9211; http://lattes.cnpq.br/0477576296995064; Alves, Karina Aline; https://orcid.org/0000-0002-8916-0224; http://lattes.cnpq.br/6915234182529881
    Soybean and corn are cultivated worldwide, having great economic importance in Brazil. Plant growth-promoting rhizobacteria inhabit the soil and are frequently isolated from the rhizosphere of various cultivated plants. Bacteria of the genus Bacillus have great potential to be used as biological control agents, thereby maintaining seed viability. Therefore, the objective of this research was to evaluate the inoculation of plant growth-promoting bacteria (Bacillus spp.) on the development of corn and soybean crops. The bacteria used in this work belong to the microorganism collection of the Soil Laboratory at the State University of Northern Paraná. These were isolated from soil samples subjected to three years of biological fertilization. From the isolated strains, three Bacillus bacteria were selected and designated Isolates 1, 2 and 3. The studies were carried out with soybean cultivar BMX POTÊNCIA and corn cultivar KWS 9004. The treatments used in the soybean and corn experiments are shown in Table 1. Bacteria inoculation was performed prior to sowing. Treatments were applied shortly before sowing; both seed types were treated in the shade, using a solution volume of 800 mL/100 kg of seeds. In all treatments, including the control, the fungicide/insecticide Standak Top was applied at a dose of 2.0 mL/100 kg of seeds. Evaluations included post-harvest chemical analysis of soybean and corn, analysis of soil microbiological attributes, and plant growth parameters (shoots, roots, and yield). It may be concluded that in soybean, interaction was observed with the pH factor and in the mineralization of P and K; microbial population increased in treatment B3‑2, whereas yield decreased in treatment B1‑2. In corn, interaction was observed with P and K, which differed significantly from the control but did not differ among inoculated treatments; microbial population also increased in treatments B1‑2 and B2‑1, accompanied by yield increase in treatment B2‑1. Inoculation with Bacillus spp. produced distinct results in soybean and corn. Further studies are needed, including testing cell protectors that maintain bacterial viability during seed germination and assessing other environmental variables that may interfere with bacterial survival. Nevertheless, there is substantial potential for commercial inoculant development.