Toler?ncia de gram?neas tropicais em solo contaminado com mangan?s

Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2022-12-07T22:08:22Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) willian_cleisson_lopes_souza.pdf: 947133 bytes, checksum: 30dcc1717102f00ff76349ce845a9c4a (MD5) Approved for entry into archive by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2022-12-07T23:02:39Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) willian_cleisson_lopes_souza.pdf: 947133 bytes, checksum: 30dcc1717102f00ff76349ce845a9c4a (MD5) Made available in DSpace on 2022-12-07T23:02:39Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) willian_cleisson_lopes_souza.pdf: 947133 bytes, checksum: 30dcc1717102f00ff76349ce845a9c4a (MD5) Previous issue date: 2022 Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM) Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico (CNPq) A fitorremedia??o ? uma t?cnica com alta viabilidade devido seu baixo custo e m?nimo impacto ambiental. No entanto, h? poucos resultados quanto ao uso de gram?neas tropicais na fitorremedia??o de mangan?s (Mn), assim como, n?o h? defini??o sobre qual extrator ? mais adequado para avaliar a disponibilidade do Mn nos solos. O objetivo deste estudo foi avaliar o crescimento de gram?neas tropicais em solo contaminado com Mn e analisar a disponibilidade de Mn no solo. As gram?neas avaliadas foram as cultivares ?Aruana? e ?Tanz?nia? de Megathyrsus maximus, as ?Xara?s? e ?Marandu? de Urochloa brizantha e Basilisk de Urochloa decumbens crescidas em LATOSSOLO VERMELHO-AMARELO distr?fico adicionado de 0, 50, 150 e 450 mg de Mn por kg-? de solo. O experimento foi conduzido em casa de vegeta??o, e o delineamento experimental foi inteiramente casualizado em esquema fatorial 5x4, com tr?s repeti??es. O per?odo experimental foi de 90 dias, com in?cio ap?s o corte de uniformiza??o das plantas e foi avaliado a mat?ria seca da parte a?rea e das ra?zes das gram?neas. A concentra??o de Mn na mat?ria seca e dispon?vel no solo foram extra?dos por Mehlich-1 e DTPA pH 7,3, enquanto o teor semitotal determinado pelo USEPA 3051 e total de Mn pelo m?todo USEPA 3052. As gram?neas tropicais tiveram seu crescimento reduzido com o aumento das doses de Mn no solo, havendo uma redu??o m?dia para maior dose de 72 % para ?Aruana?, 73 % para ?Basilisk?, 79 % para ?Marandu?, 93 % para ?Xara?s? e 95 % para ?Tanz?nia?. A cultivar ?Aruana? apresentou maior potencial para fitoextra??o devido sua maior capacidade de acumular o Mn em sua biomassa, seguido pela cv. ?Basilisk?. Os quatro diferentes extratores utilizados foram eficientes para mensurar as concentra??es de Mn no solo, com maiores n?veis cr?ticos toxidez de Mn para os m?todos USEPA 3051 em fun??o do car?ter de extra??o semitotal, e USEPA 3052 devido ? extra??o total de Mn. Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2022. Phytoremediation is a highly viable technique due to its low cost and minimal environmental impact. However, there are few results regarding the use of tropical grasses in manganese (Mn) phytoremediation, as well as there is no definition on which extractor is more suitable to assess the availability of Mn in soils. The objective of this study was to evaluate the growth of tropical grasses in soil contaminated with Mn and to analyze the Mn availability in the soil. The evaluated grasses were cultivars 'Aruana' and 'Tanzania' of Megathyrsus maximus, 'Xara?s' and 'Marandu' of Urochloa brizantha and 'Basilisk' of Urochloa decumbens grown in Typic Hapludox (Oxisol) with 0, 50, 150 and 450 mg of Mn per kg-? of soil. The experiment was carried out in a greenhouse, and the experimental design was completely randomized in a 5x4 factorial scheme, with three replications. The experimental period was 90-days, starting after the uniformization cut of the plants and the dry matter of the shoot and roots of the grasses was evaluated. The Mn concentration in dry matter and available in the soil were extracted by Mehlich-1 and DTPA pH 7.3, while the semi-total concentration determined by USEPA 3051 and total Mn by the USEPA 3052 method. Tropical grasses had their growth reduced with the increasing Mn rates in the soil, with an average reduction for the highest rate of 72 % for 'Aruana', 73 % for 'Basilisk', 79 % for 'Marandu', 93 % for 'Xara?s' and 95 % to 'Tanzania'. The 'Aruana' cultivar showed the greatest potential for phytoextraction due to its greater ability to accumulate Mn in its biomass, followed by cv. 'Basilisk'. The four different extractors used were efficient to measure Mn concentrations in the soil, with higher critical level of Mn toxicity for the USEPA 3051 method due to the semi-total extraction character, and USEPA 3052 due to the total Mn extraction.