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Previous issue date: 2017-10-20 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Para um bom desenvolvimento e produtividade a cultura de eucalipto exige, principalmente nos primeiros estágios do seu desenvolvimento, grande quantidades de fósforo (P), que é um nutriente essencial para o metabolismo do eucalipto, sua ausência afeta o desenvolvimento comprometendo sua produtividade. Devido à baixa disponibilidade desse nutriente nos solos brasileiros, altas doses de adubos fosfatados são utilizadas a fim de suprir a necessidade nutricional da planta, o que não obtém sucesso, devido à precipitação e combinação com as partículas do solo. O objetivo do presente estudo foi avaliar a atividade das bactérias Azospirillum brasilense e Bacillus subtilis em solubilizar fósforo para mudas de eucalipto no período inicial do seu desenvolvimento. As mudas foram replantadas em vasos e receberam os inóculos em três doses, sendo 1ml, 10ml e 20ml na concentração 1x10⁷. Após o plantio as mudas foram aspergidas diariamente com água e permaneceram em condições ambientais, sendo avaliadas nos períodos de 40 e 70 dias após o plantio. Comparando os parâmetros de crescimento das mudas de eucalipto e os períodos de avaliação, não houve diferenças significativas entre os tratamentos. O número de bactérias totais variou entre tratamentos e períodos, mas não se verificou aumento significativo quando comparados ao controle. As concentrações de fósforo solúvel no solo, não apresentaram diferenças significativas entre si, os tratamentos que receberam os inóculos bacterianos apresentaram concentrações de fósforo no solo semelhantes quando comparados ao controle. As quantidades de fósforo nas folhas variaram entre os tratamentos e controle, e não verificou aumento nas concentrações entre os tratamentos. Os resultados sugerem que a inoculação do Azospirillum brasilense e Bacillus subtilis solubilizadores de fósforo no período inicial de desenvolvimento da cultura de eucalipto não apresentaram diferenças entre os tratamentos e as doses, embora não apresentassem uma promoção no crescimento das plantas, as concentrações de fósforo mostraram-se semelhantes ao controle. / For a good development and productivity the eucalyptus crop demands, mainly in the early stages of its development, great amounts of phosphorus (P), which is an essential nutrient for the metabolism of eucalyptus, its absence affects the development compromising its productivity. Due to the low availability of this nutrient in Brazilian soils, high doses of phosphate fertilizers are used in order to supply the nutritional need of the plant, which is not successful due to precipitation and combination with the soil particles. The objective of the present study was to evaluate the activity of the bacteria Azospirillum brasilense and Bacillus subtilis in solubilizing phosphorus for eucalyptus seedlings in the initial period of its development. The seedlings were replanted in pots and inoculated in three doses, being 1ml, 10ml and 20ml in the 1x10 concentração concentration. After planting the seedlings were sprayed daily with water and remained in environmental conditions, being evaluated in the periods of 40 and 70 days after planting. Comparing the growth parameters of eucalyptus seedlings and the evaluation periods, there were no significant differences between treatments. The number of total bacteria varied between treatments and periods, but there was no significant increase when compared to the control. The concentrations of soluble phosphorus in the soil did not present significant differences among them, the treatments that received the bacterial inocula had similar concentrations of phosphorus in the soil when compared to the control. The amounts of phosphorus in the leaves varied between the treatments and control, and did not verify increase in the concentrations between the treatments. The results suggest that the inoculation of Azospirillum brasilense and Bacillus subtilis phosphorus solubilizers in the initial period of development of the eucalyptus crop showed no differences between the treatments and the doses, although they did not present a promotion in the growth of the plants, if similar to the control.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/152278 |
| Date | 20 October 2017 |
| Creators | Silva, Joviany Talita da |
| Contributors | Universidade Estadual Paulista (UNESP), Rigobelo, Everlon Cid |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 600, 600 |
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