Consulta: subjectFacets:"Microbial activity"
Registros recuperados: 19
Data/hora: 11/06/2024 07:19:17

Parâmetros microbiológicos e enzimáticos em área cultivada com cana-de-açúcar com diferentes quantidades de palha.
Provedor de dados: 14
Autores: VIEIRA, R. F.; RAMOS, N. P.; PAZIANOTTO, R. A. A.
Resumo - Os efeitos da manutenção de quantidades diferentes de palha foram avaliados após a colheita da cana-de-açúcar, utilizando indicadores microbiológicos e enzimáticos de solo. O experimento foi conduzido utilizando três quantidades de palha: T0, toda a palha foi retirada do solo; T50 e T100, 50% e 100% da palha foram mantidas sobre o solo, respectivamente. O N da biomassa microbiana e a atividade da beta-glucosidase (AG) aumentaram com as quantidades de palha, ao contrário da atividade da urease. A respiração basal apresentou tendência crescente com o aumento das quantidades de palha. O nitrogênio potencialmente mineralizável (NPM) não apresentou diferença significativa entre os T50 e T100, mas foi maior do que o obtido no T0. Os resultados relativos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Qualidade do solo; Atividade microbiana; Solo; Palha; Microbiologia do Solo; Uréase; Cana de Açúcar; Straw mulches; Sugarcane; Sugarcane soils; Soil quality; Microbial activity; Beta-glucosidase.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1124307

Imidazolinone Degradation in Soil in Response to Application History
Provedor de dados: 87
Autores: Bundt,A.C.; Avila,L.A.; Pivetta,A.; Agostinetto,D.; Dick,D.P.; Burauel,P.
Accelerated herbicide degradation consists in its faster degradation in areas where it has been previously applied, due to the adaptation of microbial population to that particular compound. Accelerated degradation can reduce herbicide persistence and reduce its efficacy in soil. The objective of this study was to investigate if imidazolinone herbicides have enhanced microbial degradation in rice paddy soils. A laboratory experiment was conducted, evaluating the CO2 evolution rate from soils with and without history of herbicide application (imazapyr + imazapic and imazethapyr + imazapic), incubated with imidazolinone herbicides: imazethapyr, imazapyr, imazapic, imazamethabenz, imazamox and an untreated check. The amount of CO2 released from the soil was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Residual effect; Herbicide; Microbial activity; Oryza sativa.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200341

Pedochronology and development of peat bog in the environmental protection area pau-de-fruta - Diamantina, Brazil
Provedor de dados: 90
Autores: Campos,José Ricardo da Rocha; Silva,Alexandre Christófaro; Vasconcellos,Leandro Lara; Silva,Daniel Valladão; Romão,Rafael Vitor; Silva,Enilson de Barros; Grazziotti,Paulo Henrique.
In the region of the Serra do Espinhaço Meridional, peat bog is formed in hydromorphic environments developed in sunken areas on the plain surfaces with vegetation adapted to hydromorphic conditions, favoring the accumulation and preservation of organic matter. This pedoenvironment is developed on the regionally predominant quartzite rocks. Peat bog in the Environmental Protection Area - APA Pau-de-Fruta, located in the watershed of Córrego das Pedras, Diamantina,Brazil, was mapped and three representative profiles were morphologically characterized and sampled for physical, chemical and microbiological analyses. The organic matter was fractionated into fulvic acid (FA), humic acids (HA) and humin (H). Two profiles were sampled to determine the radiocarbon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organosols; Soil organic matter; Humic substances; Microbial activity; Radiocarbon dating; Δ13C.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000600021

Early Changes in Soil Metabolic Diversity and Bacterial Community Structure in Sugarcane under Two Harvest Management Systems
Provedor de dados: 90
Autores: Azevedo,Lucas Carvalho Basilio; Morais,Marcio; Lambais,Marcio Rodrigues.
Preharvest burning is widely used in Brazil for sugarcane cropping. However, due to environmental restrictions, harvest without burning is becoming the predominant option. Consequently, changes in the microbial community are expected from crop residue accumulation on the soil surface, as well as alterations in soil metabolic diversity as of the first harvest. Because biological properties respond quickly and can be used to monitor environmental changes, we evaluated soil metabolic diversity and bacterial community structure after the first harvest under sugarcane management without burning compared to management with preharvest burning. Soil samples were collected under three sugarcane varieties (SP813250, SP801842 and RB72454) and two harvest management...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 16S rRNA gene; Harvest management; Metabolic profile; Microbial activity; PCR-DGGE.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000300701

Chemical and biological properties of phosphorus-fertilized soil under legume and grass cover (Cerrado region, Brazil)
Provedor de dados: 90
Autores: Souza,Marcelo Fernando Pereira; Silva,Mariana Pina da; Arf,Orivaldo; Cassiolato,Ana Maria Rodrigues.
The use of cover crops has been suggested as an effective method to maintain and/or increase the organic matter content, while maintaining and/or enhancing the soil physical, chemical and biological properties. The fertility of Cerrado soils is low and, consequently, phosphorus levels as well. Phosphorus is required at every metabolic stage of the plant, as it plays a role in the processes of protein and energy synthesis and influences the photosynthetic process. This study evaluated the influence of cover crops and phosphorus rates on soil chemical and biological properties after two consecutive years of common bean. The study analyzed an Oxisol in Selvíria (Mato Grosso do Sul, Brazil), in a randomized block, split plot design, in a total of 24 treatments...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial biomass carbon; Microbial activity; Organic matter; Cover plants; Cerrado.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600006

Soil microbial biomass under different management and tillage systems of permanent intercropped cover species in an orange orchard
Provedor de dados: 90
Autores: Balota,Elcio Liborio; Auler,Pedro Antonio Martins.
To mitigate soil erosion and enhance soil fertility in orange plantations, the permanent protection of the inter-rows by cover species has been suggested. The objective of this study was to evaluate alterations in the microbial biomass, due to different soil tillage systems and intercropped cover species between rows of orange trees. The soil of the experimental area previously used as pasture (Brachiaria humidicola) was an Ultisol (Typic Paleudult) originating from Caiuá sandstone in the northwestern part of the State of Paraná, Brazil. Two soil tillage systems were evaluated: conventional tillage (CT) in the entire area and strip tillage (ST) (strip width 2 m), in combination with different ground cover management systems. The citrus cultivar 'Pera'...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial activity; Soil tillage; Nutrient cycling; Citrus management.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600004

Microbial and soil properties in restoration areas in the jequitinhonha valley, Minas Gerais
Provedor de dados: 90
Autores: Santos,Danielle Cristina Fonseca; Grazziotti,Paulo Henrique; Silva,Alexandre Christófaro; Trindade,Aldo Vilar; Silva,Enilson de Barros; Costa,Lidiomar Soares da; Costa,Hesmael Antônio Orlandi.
To mitigate the impacts of eucalypt monoculture, forestry companies in the Upper Jequitinhonha Valley (MG) have adopted the insertion of strips of native vegetation in-between the commercial plantations. The method used for the creation of these corridors is to allow spontaneous regrowth of native vegetation in areas previously under eucalypt. The objective of this study was to evaluate the effect of cover crops on microbial and soil properties for a detailed description of the restoration process of native vegetation in forest soils of the Jequitinhonha Valley. The treatments were represented by an initial restoration stage (&lt; 4 years) with or without remaining eucalypt and the advanced restoration stage (&amp;gt; 4 years) with or without remaining...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spontaneous regrowth; Soil quality; Degraded areas; Microbial biomass; Microbial activity.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000600035

Soil microbial biomass under different tillage and levels of applied pig slurry
Provedor de dados: 91
Autores: Balota,Elcio L.; Machineski,Oswaldo; Matos,Maria A.
ABSTRACT The objective of this work was to evaluate the changes in microbial biomass C, N and P due to the application of pig slurry under different soil tillage systems. The experiment was established in a clayey Oxisol, Eutrophic Red Latossol in Palotina, PR. Different quantities of pig slurry (0, 30, 60 and 120 m3 ha-1 year-1) were applied to the soil prior to the summer and winter crop season under conventional tillage (CT) and no tillage (NT), in three replicates. The area was cultivated with soybean (Glycine max L.) or maize (Zea mays L.) in the summer and wheat (Triticum sativum Lam.) or oat (Avena sativa L.) in the winter. The soil samples were collected in March and October of 1998 and 1999 at depths of 0-5, 5-10 and 10-20 cm. The soil tillage and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial activity; Swine manure; Soil management; Nutrient cycling.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662012000500004

Addition of waste and introduction of microorganisms after 45 years of soil degradation
Provedor de dados: 124
Autores: Santos,Adriana Avelino; Agustini,José Antônio; Maltoni,Kátia Luciene; Cassiolato,Ana Maria Rodrigues.
ABSTRACT The construction of hydroelectric power plants (HPP) may result in environmental problems, such as extensive areas of exposed subsoil and conditions of extreme degradation. These areas require alternative that minimize impact and allow partial recovery of their ecosystem functions and vegetation. This study aimed to evaluate the effects of residue addition (organic/macrophytes - OR and inorganic/ash - AR), hydrogel, and inoculation of microorganisms in degraded soil, cultivated with Jatropha curcas, through fertility and microbial activity. A conserved Cerrado ("savannah") soil was the source of microorganisms - mainly mycorrhizal fungi. The experiment was conducted for 12 months (during 2010/2011) at the farm of UNESP-School of Engineering/Campus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Jatropha curcas; Macrophytes; Sugar cane ash; Hydrogel; Cerrado; Microbial activity.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300363

Resilience of soil microbial activity and of amino acid dynamics to the removal of plant carbon inputs during winter
Provedor de dados: 63
Autores: Avramides,Elizabeth J.; Christou,Matina; Jones,David L.
Many temperate agricultural soils have prolonged periods in the winter when plant carbon inputs to the soil are low. Soil maintained at low temperature in the absence of plants was used to simulate the conditions in a vineyard soil during winter. In a four month simulated overwintering period we showed that the concentration of dissolved organic carbon and nitrogen in soil solution slowly declined alongside heterotrophic soil respiration. Measurements of free amino acid concentrations and turnover indicated that the amino acid pool in soil was rapidly depleted but readily replenished throughout the four-month period. This indicates that the soil contained intrinsic reserves of labile C that was capable of supporting the soil microbial community in times of...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: DOC; DON; Microbial activity; Mineralization; Nitrate; Storage.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100019

Dried powders of velvetbean and pine bark added to soil reduce Rhizoctonia solani-induced disease on soybean
Provedor de dados: 102
Autores: Blum,Luiz E. B.; Rodríguez-Kábana,Rodrígo.
Diseases induced by Rhizoctonia solani, like damping-off and root and stem rot on soybean (Glycine max), are a serious problem around the world. The addition of some organic material to soil is an alternative control for these diseases. In this study, benzaldehyde and dried powders of kudzu (Pueraria lobata), velvetbean or mucuna (Mucuna deeringiana), and pine bark (Pinus spp.) were used in an attempt to improve soybean plant growth and to reduce the disease R. solani (AG-4) causes on soybean. Benzaldehyde (0.1-0.4 mL/kg of soil) and velvetbean (25-100 g/kg) significantly (P &lt; 0.05) reduced mycelial growth of R. solani in laboratory tests. In greenhouse experiments, the percentage of non-diseased plants was higher in treatments with pine bark and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max; Mucuna deeringiana; Damping-off; Microbial activity.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582006000300004

Biomassa microbiana, em um Argissolo Vermelho, em diferentes coberturas vegetais, em área cultivada com mandioca - DOI: 10.4025/actasciagron.v30i4.5301
Provedor de dados: 1
Autores: Mercante, Fabio Martins; EMBRAPA; Silva, Rogério Ferreira da; EMBRAPA; Francelino, Silvana Fabbro; UNIGRAN; Cavalheiro, Juliana Cristina Touro; EMBRAPA; Otsubo, Auro Akio; EMBRAPA.
Objetivou-se avaliar a influência de cultivos de mandioca, em diferentes sistemas de manejo sobre a biomassa microbiana de solo, sua atividade e índices derivados. O estudo foi conduzido no Município de Glória de Dourados, Estado do Mato Grosso do Sul, em Argissolo Vermelho, de textura arenosa, em sistema de preparo convencional, plantio direto, sobre resíduos culturais de mucuna, sorgo e milheto, além de sistema com vegetação nativa, usado como referencial para comparação. As avaliações foram realizadas em seis épocas distintas: maio/2003, junho/2003, novembro/2003, abril/2004, agosto/2004 e novembro/2004. A presença ou ausência de resíduos vegetais influenciou diretamente a microbiota do solo, indicando que o uso de plantas de cobertura, no cultivo de...
Palavras-chave: 5.01.00.00-9    Agronomia plantio direto; Carbono orgânico; Atividade microbiana; Manihot esculenta. no-tillage; Organic matter; Microbial activity; Manihot esculenta.
Ano: 2008
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5301

Microbiological Indicators of Soil Quality Under Native Forests are Influenced by Topographic Factors
Provedor de dados: 42
Autores: TEIXEIRA,ANITA F.S.; SILVA,JACQUELINE S.; VILELA,LAÍZE A.F.; COSTA,PATRÍCIA F.; COSTA,ELAINE M. DA; GUIMARÃES,AMANDA A.; SANTOS,JESSÉ V. DOS; SILVA,SÉRGIO H.G.; CARNEIRO,MARCO AURÉLIO C.; MOREIRA,FATIMA M.S.
Abstract: Several microbiological indicators of soil quality present high sensitivity, but little is known about the influence of topographic factors on them. This work aimed to evaluate variability of biological indicators of soil quality across a hillslope under native forest and the influence of topographic factors on them. Four positions on a hillslope were evaluated. Activity of the enzymes β-glucosidase, acid phosphatase, urease and fluorescein diacetate (FDA) hydrolysis were determined, as well as basal and substrate-induced respiration, and density of microorganisms: total bacteria, total fungi, actinobacteria, phosphate solubilizers, ammonifiers, native rhizobia, free-living N2-fixing bacteria, spores of arbuscular mycorrhizal fungi and percentage...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological indicators; Digital elevation model; Enzymes; Microbial activity; Random forest.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700866

Microbial biomass and organic matter in an oxisol under application of biochar
Provedor de dados: 53
Autores: Petter,Fabiano André; Leite,Luiz Fernando Carvalho; Machado,Diogo Milhomem de; Marimon Júnior,Ben Hur de; Lima,Larissa Borges de; Freddi,Onã da Silva; Araújo,Ademir Sérgio Ferreira.
ABSTRACT The aim of this study was to investigate the short- and medium-term effect of biochar on soil microbial properties, organic carbon and nitrogen in an Oxisol from Brazil. The experiment was conducted in a randomized block design consisting of five levels of biochar (0, 2, 4, 8 and 16 Mg∙ha–1) with and without of synthetic fertilizer: 0 and 200 kg.ha–1 of synthetic fertilizer N-P-K (00-20-20). The following soil properties were determined: microbial biomass carbon (MBC) and nitrogen (MBN), microbial respiration (MR), metabolic quotient (qCO2) and microbial quotient (qMIC), total organic carbon (TOC) and nitrogen (TN). The MBC, qCO2 and carbon management index (CMI) were not altered by doses of fertilizer and biochar. The presence of biochar reduced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial activity; Soil organic carbon; Metabolic quotient; Brazilian soil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000100109

Differential response of microbial respiration to supplied nitrogen forms in 3 contrasting alpine meadow soils on the Tibetan Plateau
Provedor de dados: 53
Autores: Zeng,Xiaoyang.
ABSTRACT An incubation experiment was conducted to examine the effects of nitrogen (N) applications in different forms (NH4NO3, NH4Cl, and KNO3) on microbial respiration considering 3 different alpine meadow soils (C poor soil, pH = 8.1, 1.6% C; C moderate soil, pH = 6.0, 5.0% C; C rich soil, pH = 7.1, 7.4% C) in the Tibetan Plateau. The addition of NH4NO3 and NH4Cl increased the microbial respiration in C poor soil, but KNO3 had no effect. The inorganic N forms had no effects on C rich soil, but decreased microbial respiration in C moderate soil. Soil microbial respiration levels across the different types were ordered as follows: C poor soil &lt; C rich soil &lt; C moderate soil, regardless of N addition. These results suggest that the effect of N on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C cycling; Microbial activity; N deposition; Soil properties; High-altitude region.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300416

Glycolytic activities in size-fractionated water samples: emphasis on rhamnosidase, arabinosidase and fucosidase activities
Provedor de dados: 52
Autores: Colombo-Corbi,Vanessa; Dellamano-Oliveira,Maria José; Vieira,Armando Augusto Henriques.
Glycolytic activities of eight enzymes in size-fractionated water samples from a eutrophic tropical reservoir are presented in this study, including enzymes assayed for the first time in a freshwater environment. Among these enzymes, rhamnosidase, arabinosidase and fucosidase presented high activity in the free-living fraction, while glucosidase, mannosidase and galactosidase exhibited high activity in the attached fraction. The low activity registered for rhamnosidase, arabinosidase and fucosidase in the attached fraction seemed contribute to the integrity of the aggregate and based on this fact, a protective role for these structures was proposed. The presented enzyme profiles and the differences in the relative activities probably reflected the organic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eutrophic reservoir; Extracellular polysaccharides; Phytoplanktonic bloom; Microbial activity; Size-fractionated samples.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300013

Filamentous fungi isolated from Brazilian semiarid tolerant to metallurgical industry wastes: an ex situ evaluation
Provedor de dados: 52
Autores: Silva Júnior,Flavio Manoel Rodrigues da; Pereira,Sônia Valéria.
The purpose of this study was to assess the impact of metallurgical industry wastes on the semiarid soil microbiota using physico-chemical and microbiological parameters, highlighting the filamentous fungi assembly. Soil samples were collected in an area of industrial waste deposit contaminated with lead and mixed with natural soil (control soil) in seven different concentrations (0, 7.5, 15, 30, 45, 60 and 100%). The results showed alterations on the physico-chemical properties of the soil treated with industrial wastes, with a gradate increase of the soil's pH (5.6-10.4) and electrical conductivity (0.3-14.7 dS m-1) and also reduction of organic matter (7.0-1.8%). The use of microbiological parameters (fungal richness and diversity, CO2emission, and the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaetomium; Microbial activity; Contaminated soils; Filamentous fungi; Lead.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000500723

Evaluation of pasture soil productivity in the semi-arid zone of Brazil by microbial analyses
Provedor de dados: 58
Autores: Luna,Rômulo Gil de; Coutinho,Henrique Douglas Melo; Grisi,Breno Machado.
The productivity of a pasture soil (caatinga) located in the region of São João do Cariri, PB, Brazil was evaluated based an the following microbiological parameters: biomass (measured by fumigation-incubation method), activity (estimated from basal respiration and cellulose decomposition rate), qCO2, and Cmic : Corg ratio. This analysis demonstrated that livestock management in the 'caatinga' is probably causing environment damage by affecting the soil properties, reducing the microbial biomass and soil respiration and increasing the qCO2, affecting the recovery of this ecosystem.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semi-arid; Biomass; Microbial activity; Pasture; Caatinga.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000300001

Soil microbial biomass in organic farming system
Provedor de dados: 65
Autores: Araújo,Ademir Sérgio Ferreira de; Melo,Wanderley José de.
Agricultural production systems have to combine management practices in order to sustain soil's profitability and quality. Organic farming is gaining worldwide acceptance and has been expanding at an annual rate of 20% in the last decade, accounting for over 24 million hectares worldwide. Organic practices avoid applications of synthetic fertilizers and pesticides, rely on organic inputs and recycling for nutrient supply, and emphasize cropping system design and biological processes for pest management, as defined by organic farming regulation in the world. In comparison with conventional farming, organic farming has potential benefits in improving food quality and safety. Plant production in organic farming mainly depends on nutrient release as a function...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil microorganisms; Microbial activity; Organic C; Soil quality.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782010001100029