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1. NPK fertilization for the first years of physic nut cultivated in two regions.

Author

Silva, Enilson de Barros, Santos, Lauana Lopes dos, Grazziotti, Paulo Henrique, Bezerra, Iracema Raquel Santos, Souza, Willian Cleisson Lopes de, Miranda, Li Chaves, Santos, Ângela Aparecida, Silva, Wesley Costa, and Uane, Bento Gil

Subjects
OILSEED plants, MINERALS in nutrition, PLANT growth, CROP growth, OILSEEDS
Abstract

The physic nut is an oilseed plant that has stood out as an alternative source for biodiesel. However, using it in this way requires determining the edaphoclimatic conditions and adequate fertilization to guarantee maximum productivity. This study objectived to evaluate and establish adequate rates of Nitrogen (N), Phosphorus (P), Potassium (K) to maximize the growth and productivity of physic nut in two edaphoclimatic conditions. Two experiments were performed over two consecutive years, one under Quartzarenic Neosol in the municipality of Diamantina and the other under Red-Yellow Latosol in the municipality of Governador Valadares. The treatments comprised rates of N: 0, 25, 50, 100 kg ha−1; P: 0, 35, 70, 140 kg ha−1; and K: 0, 40, 80, 160 kg ha−1. Plant growth was evaluated every 30 days until flowering. Seed and oil productivity was also assessed, with one harvest in Diamantina and two harvests in Governador Valadares. The edaphoclimatic condition of Governador Valadares was a determining factor in providing greater growth and productivity of the physic nut when compared to that of Diamantina. The application of N rates was unnecessary for the growth and productivity of the physic nut in Diamantina. Thus, phosphate fertilization was unnecessary in Governador Valadares and potassium fertilization was unnecessary for both regions. In Diamantina, 84 kg ha−1 and 87 kg ha−1 of P is recommended for growth and maximum productivity, respectively. Whereas, in Governador Valadares, 49 kg ha−1 and 55 kg ha−1 of N is recommended for growth and maximum crop productivity, respectively. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Toxicity and Availability of Manganese in the Growth of Tropical Grasses in Contaminated Soil.

Author

Silva, Enilson de Barros, Souza, Willian Cleisson Lopes de, Nardis, Barbara Olinda, Alleoni, Luís Reynaldo Ferracciú, Grazziotti, Paulo Henrique, Santos, Lauana Lopes dos, Bezerra, Iracema Raquel Santos, Alves, Flávio Antônio Fernandes, Silva, Wesley Costa, Uane, Bento Gil, Nascimento, Sandra Antunes do, and Koo, Bon-Jun

Subjects
SIGNALGRASS, SOIL pollution, PHYTOREMEDIATION, GRASSES, EXPERIMENTAL design
Abstract

Phytoremediation is a technique with high viability due to its low cost and minimal environmental impact. However, there are a few results regarding the use of tropical grasses in the phytoremediation of manganese (Mn), and there is no clear definition of which extractor is more suitable for assessing Mn availability in soils. The objective of this study was to evaluate the growth potential and phytoremediation of five tropical grasses in Mn‐contaminated soil, as well as to assess the efficiency of four extractors in Mn extraction. The grass cultivars evaluated included Aruana and Tanzânia of Megathyrsus maximus, Xaraés and Marandu of Urochloa brizantha, and Basilisk of Urochloa decumbens grown in Typic Hapludox (Oxisol) amended with 0, 50, 150, and 450 mg of Mn per kg−1 of soil. The experiment was conducted in a greenhouse, using a completely randomized experimental design in a 5 × 4 factorial scheme, with five replications. The experimental period lasted for 90 days. The dry matter of the shoot and root of the grasses was evaluated. Mn concentration in dry matter and its availability in soil were extracted by Mehlich‐1 and DTPA pH 7.3, while the semitotal concentration was determined by USEPA 3051 and total Mn by USEPA 3052 method. Tropical grasses showed reduced growth with increasing Mn rates in the soil, with the following sequence in the reduction in growth: Aruana > Basilisk > Marandu > Xaraés and lastly the Tanzânia. The Aruana cultivar showed greater potential for phytoextraction due to its higher ability to accumulate Mn in its biomass, followed by the Basilisk cultivar. The four different evaluated extractors were efficient in measuring Mn concentrations in the soil, with higher toxicity critical levels for the USEPA 3051 method due to the semitotal extraction nature and USEPA 3052 due to total Mn extraction. The growth of tropical grasses is reduced with increasing Mn rates applied to the soil. The Aruana of M. maximus grass has greater potential for phytoextraction of Mn‐contaminated soils, followed by Basilisk of Urochloa decumbens, Xaraés and Marandu of U. brizantha, and Tanzânia of M. maximus. The Mehlich‐1, DTPA pH 7.3, USEPA 3051, and 3052 extractors were efficient in extracting and evaluating Mn availability in soil for tropical grasses. The USEPA 3051 and 3052 methods presented higher toxicity critical levels. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Toler?ncia de gram?neas tropicais em solo contaminado com mangan?s

Author

Souza, Willian Cleisson Lopes de, Silva, Enilson de Barros, Grazziotti, Paulo Henrique, Fraz?o, Leidivan Almeida, and Universidade Federal dos Vales do Jequitinhonha e Mucuri (UFVJM)

Subjects
Heavy metal, Extrator, Recovery, Recupera??o, Critical level of toxicity, Extractor, N?vel cr?tico de toxidez, Metal pesado
Abstract

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.

Published
2022

10. A Reprodução vegetal

Author

Santos, Maria Isabel Gomes dos, primary, Barbosa, João Pedro Ferreira, additional, Souza, Willian Cleisson Lopes de, additional, Ferro, Jaqueline dos Santos, additional, and Barros, Rubens Pessoa de, additional

Published
2019
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