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| Registros recuperados: 39 | |
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| Hernández Hernández, Antelma. |
| Para determinar el efecto de substancias húmicas (SH) en el crecimiento del chile manzano (Capsicum pubescens R y P), en invernadero, se evaluaron tres niveles de presión osmótica de solución nutritiva Steiner (0.54, 0.72 y 0.90 atm) y tres concentraciones de aplicación foliar de substancias húmicas (0.5, 1, 1.5 ml.L-1 de agua de las SH). Las variables medidas fueron: diámetro ecuatorial (DE), diámetro polar (DP), volumen (VOL), grosor de pericarpio (GP), numero de frutos comerciales (NFRC), numero de frutos pequeños (NFRP), número total de frutos (NTOT), rendimiento (RTO), peso seco de fruto (PSFR), firmeza (FIR), sólidos solubles totales (OBRIX), capsaicina (CAPS) y macro y micronutrientes (N, P, K, Ca, Mg y Fe. Al aplicar la solución nutritiva con... |
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Palavras-chave: Substancias húmicas; Solución nutritiva; Capsicum pubescens; Rendimiento; Humic substances; Nutrient solution; Yield; Maestría; Edafología. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/381 |
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| Hernández Hernández, Antelma. |
| Para determinar el efecto de substancias húmicas (SH) en el crecimiento del chile manzano (Capsicum pubescens R y P), en invernadero, se evaluaron tres niveles de presión osmótica de solución nutritiva Steiner (0.54, 0.72 y 0.90 atm) y tres concentraciones de aplicación foliar de substancias húmicas (0.5, 1, 1.5 ml.L-1 de agua de las SH). Las variables medidas fueron: diámetro ecuatorial (DE), diámetro polar (DP), volumen (VOL), grosor de pericarpio (GP), numero de frutos comerciales (NFRC), numero de frutos pequeños (NFRP), número total de frutos (NTOT), rendimiento (RTO), peso seco de fruto (PSFR), firmeza (FIR), sólidos solubles totales (OBRIX), capsaicina (CAPS) y macro y micronutrientes (N, P, K, Ca, Mg y Fe. Al aplicar la solución nutritiva con... |
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Palavras-chave: Substancias húmicas; Solución nutritiva; Capsicum pubescens; Rendimiento; Humic substances; Nutrient solution; Yield; Maestría; Edafología. |
| Ano: 2011 |
URL: http://hdl.handle.net/10521/381 |
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| Baldotto,Lílian EB; Baldotto,Marihus A. |
| Plant regulators, as well as bioactive fractions of the organic matter, can accelerate the development and increase the efficiency of adventitious rooting in ornamental plants. We evaluated rooting in the Brazilian red-cloak (Megaskepasma erythrochlamys) and sanchezia (Sanchezia nobilis) cuttings in response to application of indole-butyric acid (IBA) and humic acids (HA). Stem cuttings of both species treated with solutions of 0, 250, 500, 1000, 2000 mg/L of IBA and 0, 10, 20, 30, 40 mmol/L of C of HA were placed in 2.0 L plastic pots containing carbonized rice husk, kept in greenhouse. Survival of cuttings, number of leaves and shoot and root fresh and dry matter were evaluated 45 days after. Data were used to run an analysis of variance. We observed the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Megaskepasma erythrochlamys; Sanchezia nobilis; Vegetative propagation; Humic substances; Auxins.. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362014000400434 |
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| Fontana, Ademir; INCRA; Silva, Cristiane Figueira da; UENF-Campos dos Goytacazes; Pereira, Marcos Gervasio; UFRRJ; Loss, Arcângelo; UFRRJ; Brito, Roberto Josino de; INCRA; Benites, Vinicius de Melo; Embrapa Solos. |
| Este trabalho objetivou avaliar os compartimentos da matéria orgânica do solo (MOS) em áreas com diferentes coberturas vegetais no entorno do Parque Estadual da Serra do Mar, Ubatuba, Estado de São Paulo. Foram selecionadas áreas cultivadas com as culturas de mandioca (monocultivo) e banana (sistema agroflorestal), uma área sob capoeira e outra sob floresta secundária (Mata Atlântica). Nestes locais foram coletadas amostras nas profundidades de 0-5 e 5-10 cm nos meses de julho/2003 (inverno) e março/2004 (verão). Foram determinados o teor de carbono orgânico total (COT), as substâncias húmicas com os teores de carbono orgânico na fração ácidos fúlvicos (C-FAF), fração ácidos húmicos (C-FAH) e humina (C-HUM) e a relação C-FAH/C-FAF e a matéria orgânica leve... |
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Palavras-chave: Carbono orgânico; Substâncias húmicas; Matéria orgânica leve organic carbon; Humic substances; Light organic matter. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5169 |
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| Nobre,Camila Pinheiro; Huertas,Orlando Carlos Tavares; Tardin,José Rogério Figueira; Saggin Júnior,Orivaldo José; Fonseca,Henrique Manoel Apolónia Coutinho; Berbara,Ricardo Luis Louro. |
| In this study, we evaluated the growth of the liverwort Lunularia cruciata, inoculated or not with the arbuscular mycorrhizal fungi (AMF) Glomus proliferum (15 spores per Petri dish), in Strullu-Romand Variant (SRV) medium modified and enriched with humic acid (HA) at different concentrations (0, 20, 40 and 80 mg C L−1), as well as the sporulation of the AMF. We assessed the absolute growth rate (AGR) and relative growth rate (RGR) at inoculation, as well as at 7, 14, 21, 28, 43, 52 and 60 days after inoculation (DAI), whereas we assessed sporulation at 25, 43, 60 and 70 DAI. The main determinant of L. cruciata growth was the presence of AMF. With and without G. proliferum inoculation, respectively, the AGR peaked at 39 and 42 DAI, and the RGR was 0.0474... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arbuscular mycorrhizal fungi; Liverworts; Monoxenic cultures; Humic substances. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000400017 |
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| Valladares,Gustavo Souza; Pereira,Marcos Gervasio; Benites,Vinícius de Melo; Anjos,Lúcia Helena Cunha dos; Ebeling,Adierson Gilvani; Guareschi,Roni Fernandes. |
| ABSTRACT Despite limited geographic expression of Organosols in Brazil, their high carbon storage capacity and natural environmental vulnerability justifies further studies on C and N stocks in these soils and their relationship to the nature of organic matter. Evaluation of physical and chemical properties of organic soils and their ability to store C is important so as to develop sustainable management practices for their preservation. The objectives of the study were to measure the total organic carbon stock (OCst), total nitrogen stock (Nst), and humic fractions in Organosols from different environments and regions of Brazil, and to correlate the data with soil chemical (pH, P, K, Ca2+, Mg2+, Al3+, H+Al, CEC, V) and physical properties (soil bulk... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic matter; Humic substances; Histic horizon; Physical and chemical properties. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100425 |
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| Toma,Maíra Akemi; Owens,Phillip Ray; Silva,Carlos Alberto; Silva,Sérgio Henrique Godinho; Silva,Elen Alvarenga; Curi,Nilton. |
| In soil surveys, it is usual to find profiles with an uncommon disposition of horizons. Dark horizons in depth might be either the consequence of erosion and redeposition of soil materials from upslope or an indication of the podzolization process, which forms a spodic horizon. Few laboratory analyses are known to characterize dark subsurface horizons which could allow for the differentiation of spodic from buried A horizons. Some researchers propose C-humic and C-fulvic acid fraction ratios and forms of carbon to analyze characteristics of these horizons. Therefore, this research aimed to characterize dark subsurface horizons found in soils under a Eucalyptus minimum tillage system in the state of Rio Grande do Sul, Brazil, and to relate soil organic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Humic substances; Organic matter; Erosion; Podzolization; Redeposition. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400334 |
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| Vale Júnior,José Frutuoso do; Nicodem,Steven; Melo,Valdinar Ferreira; Uchôa,Sandra Catia Pereira; Cruz,Diego Lima de Sousa. |
| ABSTRACT Soil organic matter (SOM) fractions result from a variety of environmental processes, which affect incorporation and production rates, decomposition, alteration, and/or mineralization of organic matter. The aim of this study was to characterize SOM under the environments of rain forest, wooded campinarana (grasslands), arboreal-shrubby campinarana, grassy-woody campinarana, and pioneer plants of the Viruá National Park, in the north of the Brazilian Amazon. After chemical and physical characterization and soil classification, total organic carbon (TOC), total N, microbial activity, organic C from fulvic acid fractions (FA), humic acid (HA), and humin (Hu) were determined at two depths (0.00-0.15 and 0.15-0.30 m). The TOC was lower in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil organic carbon; Humic substances; Campinarana; Quartzipsamment; Spodosol. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100408 |
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| Whitby, Hannah; Hollibaugh, James T.; Van Den Berg, Constant M. G.. |
| The concentrations of dissolved copper (Cu-d), copper-binding ligands, thiourea-type thiols, and humic substances (HScu) were measured in estuarine waters adjacent to Sapelo Island, Georgia, USA, on a monthly basis from April to December 2014. Here we present the seasonal cycle of copper speciation within the estuary and compare it to the development of an annually occurring bloom of Ammonia Oxidizing Archaea (AOA), which require copper for many enzymes. Two types of complexing ligands (L-1 and L-2) were found to dominate with mean complex stabilities (log K'(cuL)) of 14.5 and 12.8. Strong complexation resulted in lowering the concentration of free cupric ion (Cu2+) to femtomolar (fM) levels throughout the study and to sub-fM levels during the summer... |
| Tipo: Text |
Palavras-chave: Copper speciation; Cathodic stripping voltammetry; Humic substances; Thiols; Thiourea; Organic ligands; Thaumarchaeota; Ammonia-oxidizing archaea. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00616/72834/72735.pdf |
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| Oliveira,Mara Lucia Jacinto; Araujo,Ademir Sérgio Ferreira de; Melo,Wanderley José de. |
| Tannery sludge contains high concentrations of inorganic elements, such as chromium (Cr), which may lead to environmental pollution and affect human health The behavior of Cr in organic matter fractions and in the growth of cowpea (Vigna unguiculata L.) was studied in a sandy soil after four consecutive annual applications of composted tannery sludge (CTS). Over a four-year period, CTS was applied on permanent plots (2 × 5 m) and incorporated in the soil (0-20 cm) at the rates of 0, 2.5, 5.0, 10.0, and 20.0 Mg ha-1 (dry weight basis). These treatments were replicated four times in a randomized block design. In the fourth year, cowpea was planted and grown for 50 days, at which time we analyzed the Cr concentrations in the soil, in the fulvic acid, humic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil contamination; Humic substances; Solid residue; Heavy metals; Plant growth; Trace elements. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100297 |
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| Alister,Claudio; Araya,Manuel; Kogan,Marcelo. |
| Once pesticides reach the soil, there are several factors that affect their soil behavior. To identify the principal soil and herbicide properties that control their adsorption and leaching, a study of five Chilean agricultural and forest soils was performed. Simazine, diuron, terbuthylazine and MCPA were applied to the top of 45-cm tall by 12-cm diameter disturbed soil columns, filled with either an Andisol, Ultisol, Entisol or one of two Inceptisol soils. After herbicide applications, each lysimeter received 24 mm of simulated rain every 24 hours for five days. Once water percolation stopped, the lysimeters were divided into five sections and herbicide concentrations were quantified using High Pressure Liquid Chromatography. Relationships between soil... |
| Tipo: Journal article |
Palavras-chave: Diuron; Fulvic acids; Humic substances; MCPA; Triazines. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000200010 |
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| Rosa,Sara Dantas; Silva,Carlos Alberto; Maluf,Henrique José Guimarães Moreira. |
| ABSTRACT Extractable phosphorus (P) in soil depends on soil test employed, reactivity of fertilizer and interaction of P added to the soil properties, including organic matter. The aim of this paper was to assess the contents of P extracted from Red Latosol (LVd) and Quartzarenic Neosol (RQ) samples, incubated with 0; 5; 10; 50 or 100 mg kg-1 C-humic acid (C-HA) and 400 mg kg-1 of P, via Araxá phosphate rock (AP), Bayóvar reactive phosphate rock (BP) or single superphosphate (SS). Thus, it was adopted a five (C-HA concentrations) x three (P sources) factorial arrangement, using a randomized block design with three replications. The mixtures of soil, C-HA concentrations and P sources were incubated for 60 days; in sequence, the soil P was extracted by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Humic substances; Extractors of soil P; Soil pH; Phosphate rocks. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100032 |
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| Araujo,Jane Kelly Silva; Ribeiro,Mateus Rosas; Corrêa,Marcelo Metri; Galindo,Izabel Cristina de Luna; Souza Júnior,Valdomiro Severino de. |
| The Garanhuns Plateau in the Agreste region of the State of Pernambuco, Brazil is characterized by humid climatic conditions due to orographic rains, unlike the surrounding semiarid region. These soils are subjected to intense agricultural use and are extremely important for the regional economy. This study was carried out in the municipality of Brejão in the Agreste region with the aim of assessing changes in humic Haplustox soils subjected to different land uses. Four plots with different vegetation covers (native forest, secondary shrubby vegetation (capoeira), traditional cropping system, and planted pasture) were selected, and samples were taken from a soil profile and four small pits surrounding it at each site. Physical and chemical properties were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Land use; Highland soils; Humic substances; Aggregate stability; Microbial biomass C. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400029 |
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| DE JULIO,MARCELO; DE JULIO,TATIANE S.; DI BERNARDO,LUIZ. |
| This work used Fenton's reagent as a coagulating agent in the treatment of water samples with high true colour caused by humic substances (HS) extracted from peat. In addition, the effects of the apparent molecular size of HS on coagulation, flocculation and flotation were studied. To that end, four distinct water samples having the same true colour were prepared using HS with different molecular sizes, which were obtained by ultrafiltration fractioning. Through optimisation of coagulant dosage and coagulation pH, as well as posterior construction of coagulation diagrams for each water sample, it was verified that the sample prepared with the smallest apparent molecular size of HS was the most difficult to treat, requiring higher coagulant (Fenton's... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coagulation; DAF; Drinking water; Fenton's reagent; Humic substances; Molecular size. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200833 |
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| Carlsoon, Per; Edling, Hélène; Bechemin, Christian. |
| Dissolved organic matter in the form of riverine humic substances stimulated the growth of both axenic nitrogen-limited Alexandrium catenella cultures and nitrogen-limited cultures with a marine bacterial community present. The biomass increase of A. catenella could not be accounted for by utilization of inorganic nitrogen compounds. However, there was a considerable release of dissolved free and combined amino acids from the humic substances that was utilized by A. catenella. About 40% of the nitrogen used by A. catenella in the axenic treatment with humic substances added was taken up as organic nitrogen. Bacterial aminopeptidase and beta -glucosidase activity was stimulated by the addition of humic substances and bacterial growth increased several-fold.... |
| Tipo: Text |
Palavras-chave: Alexandrium catenella; Dinoflagellates; Bacteria; DOM; Humic substances. |
| Ano: 1998 |
URL: https://archimer.ifremer.fr/doc/00173/28431/26763.pdf |
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| Registros recuperados: 39 | |
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