PROMOÇÃO DO CRESCIMENTO DE MUDAS DE Eucalyptus benthamii, POR BACTÉRIAS SOLUBILIZADORAS DE FOSFATOS

• Ano de defesa: 2016
• Autor(a) principal: Marcolin, Giovanna
• Orientador(a): Garcia, Flávio Augusto de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual do Centro-Oeste
• Programa de Pós-Graduação: Programa de Pós-Graduação em Ciências Florestais (Mestrado)
• Departamento: Unicentro::Departamento de Ciências Florestais
• País: Brasil
• Palavras-chave em Português: Bactérias promotoras de crescimento de plantas; adubação; eucalipto
• Palavras-chave em Inglês: Phosphate solubilizing bacteria; fertilizing; eucalypt
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL; RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::MANEJO FLORESTAL
• Link de acesso: http://tede.unicentro.br:8080/jspui/handle/jspui/1322

The aim of this research was promote the growth of E. benthamii seedlings with inoculation on seeds and substrate of selected bacterial isolates, from two phosphorus sources and three dosages of this nutrient. For that, 300 E. benthamii rhizosphere and phyloplan bacteria were isolated, of these only three were able to solubilize calcium phosphate in vitro: RB023, RB030 and RB041, being the first isolate most efficient than others. The three isolates were able to grown in liquid medium containing phosphate fertilizers and changed the medium pH, making the medium acid. RB023 and RB030 are considered PGPR’s, because they were able to colonize the roots of the E. benthamii seedlings. The three isolates were selected to perform in vivo tests. The assay was established in a completely randomized design (CRD), in a threefold factorial arrangement, that factor 1 (F1) are the bacteria (three isolates and one control, without bacteria), factor 2 (F2) the phosphorus source (monoammonium phosphate and simple superphosphate) and factor 3 (F3) the recommended phosphorus dosage (0%, 50% and 100%). There was significant effect for three factors and interaction F1xF2xF3. The bacteria RB030 differed from the control in all variables evaluated, except in the root length. The simple superphosphate increased the seedlings growth average and differed from the monoammonium phosphate in diameter, aboveground biomass and total biomass. The dosage without phosphorus presented better diameter average, fresh aboveground weight, aboveground biomass and total biomass. On the average the inoculated seedlings presented 23% higher total biomass than the non-inoculated seedlings.