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| Registros recuperados: 54 | |
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| Silva,Jéssica C. N.; Silva,Arystides R.; Veloso,Carlos A. C.; Dantas,Edilândia F.; Sacramento,José A. A. S. do. |
| ABSTRACT Sustainable agricultural production systems can improve physical attributes of soil as well as increase carbon and nitrogen stocks in soils. The objective of this study was to evaluate changes in the stability of soil aggregates and contents and stocks of carbon and nitrogen after the conversion of native forest to crop-livestock-forest integration systems in the region of Western Pará. Soil samples from five management systems (including a control) were collected at three depths in a randomized block design, with five replications. The stability of the aggregates, soil density, particle density, and total soil porosity, as well as total carbon and nitrogen and their respective stocks were evaluated. The native forest had the highest percentages... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic carbon; Soil physics; Sustainability; Brazilian Amazon. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200837 |
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| FERNANDES, F. A.; CERRI, C. C.; FERNANDES, A. H. B. M.. |
| Estudou-se uma cronosseqüência de introdução de pastagens cultivadas em áreas com 10 e 20 anos de implantação, tendo uma área de Cerrado intacto como referência. Coletaram-se amostras até 40cm de profundidade ao longo de dois transectos, para cálculo dos estoques de C e N e determinações químicas. Também abriram-se trincheiras e coletaram-se amostras de solo até 1m de profundidade, para estudo das variações nos conteúdos de C e N no perfil. Após 10 anos de cultivo, o solo apresentou aumento no teor de bases trocáveis e na capacidade de troca catiônica, e diminuição da acidez. Entretanto, após 20 anos, os teores de bases trocáveis e a capacidade de troca catiônica diminuíram e a acidez aumentou, indicando tendência do sistema de retornar ao equilíbrio... |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Característica química; Bases trocáveis; Carbono orgânico; Frações húmicas; Chemical characteristics; Organic carbon; Humic fractions; Cultivated pasture.; Acidez; Fracionamento; Matéria Orgânica; Nitrogênio; Pastagem Cultivada; Solo.; Acidity; Pantanal; Fractionation; Exchangeable cations; Organic matter; Nitrogen; Soil.. |
| Ano: 2002 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810747 |
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| MORAIS, P. A. de O.; SOUZA, D. M. de; MADARI, B. E.; OLIVEIRA, A. E. de. |
| Imagens digitais de 177 amostras de solo de três regiões do Brasil foram utilizadas para desenvolver uma metodologia de análise dos parâmetros de fertilidade do solo: carbono orgânico total e textura. As imagens, obtidas com um scanner de mesa, foram correlacionadas com os parâmetros experimentais de fertilidade por meio de calibração multivariada. LSSVMR apresentou os melhores resultados para estimar os teores de areia, argila e carbono orgânico. Em seguida, a classificação textural das amostras com imagens digitais apresentou 90,6% de concordância com o método convencional. A metodologia proposta por imagens digitais, além de determinar os parâmetros de fertilidade de forma simultânea e em poucos minutos, dispensa o uso de reagentes químicos. A aplicação... |
| Tipo: Artigo de periódico |
Palavras-chave: Organic carbon; Imagem digital; Carbono; Química; Fertilidade do Solo; Textura do Solo; Texture; Soil texture; Green chemistry. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1126557 |
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| Montalvo, J. F.. |
| Los sedimentos superficiales de las bahías de Cárdenas y Santa Clara fueron muestreados en mayo de 2002 y julio de 2005, evaluándose los parámetros orgánicos e inorgánicos que tienen mayor peso en los ciclos biogeoquímicos (carbón, nitrógeno, fósforo, carbonatos, sulfuro de hidrógeno y consumo de oxidante químico). Los sedimentos de las bahías de Cárdenas y Santa Clara, poseen notables contenidos de carbón orgánico y concentraciones de nitrógeno inferiores a 0,2 %, evidenciando que la fuente principal de materia orgánica en estos cuerpos de agua es la vegetación periférica y acuática, rica en carbono y pobre en nitrógeno. En estas bahías las concentraciones promedio de carbonatos son superiores al 35 %, aunque la mayor riqueza corresponde a la bahía de... |
| Tipo: Journal Contribution |
Palavras-chave: Sediments; Organic carbon; Nitrogen; Hydrogen sulphide; Bays; Nitrogen; Hydrogen sulphide; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_15986. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/3342 |
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| SOUZA, L. M. de; SOUSA, D. M. G. de; REIS JUNIOR, F. B. dos; MENDES, I. de C.. |
| O objetivo deste trabalho foi avaliar as relações entre os métodos de oxidação úmida e combustão a alta temperatura, utilizados em determinações do carbono da biomassa microbiana, e verificar a necessidade do uso de fatores de correção entre os dois métodos. Foram utilizadas 96 amostras de solo, coletadas à profundidade de 0?10 cm em Latossolos Vermelhos argilosos de Cerrado, sob cultivos anuais, pastagens, eucalipto e vegetação nativa. O carbono da biomassa microbiana foi determinado a partir de extratos de K2 SO4, pelo método de fumigação?extração, por meio de oxidação úmida com dicromato de potássio com aquecimento externo, e por combustão a alta temperatura em analisador de C orgânico total. Observou?se relação linear positiva e significativa entre os... |
| Tipo: Separatas |
Palavras-chave: Analisador de carbono; Bioindicador; Carbono orgânico; Fumigação-extração; Carbon anayzer; Bioindictors; Organic carbon; Fumigation-extraction; Soil quality. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1035360 |
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| Scheid,Douglas Leandro; Silva,Rodrigo Ferreira da; Silva,Vanderlei Rodrigues da; Ros,Clovis Orlando Da; Pinto,Marlo Adriano Bison; Gabriel,Márcia; Cherubin,Maurício Roberto. |
| ABSTRACT: Chemical and physical properties of soil can be altered with the successive application of liquid swine manure (LSM), also known as slurry. Therefore, monitoring the impact of LSM is essential to an assessment of the potential agronomic and environmental benefits and risks associated with management practices. The aim of this study was to evaluate the effects of LSM on the chemical and physical attributes of soil under pasture (Cynodon spp.), located in southern Brazil. Four areas were sampled: three areas cultivated with Cynodon spp. pasture with successive applications of 200 m3 ha–1 y–1 of LSM for three, eight and 15 years; and untreated native forest as a reference. The soil attributes evaluated were: organic carbon (OC), active (pH water)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Management of organic residues; Organic carbon; Nutrient availability; Soil compaction; Soil chemistry. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501401 |
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| Ochoa,Guido; Oballos,Jajaira; Velásquez,Juan Carlos; López,Isabel; Manrique,Jorge. |
| The majority (60 %) of the soils in the Venezuelan Andes are Inceptisols, a large percentage of which are classified as Dystrustepts by the US Soil Taxonomy, Second Edition of 1999. Some of these soils were classified as Humitropepts (high organic - C-OC-soils) and Dystropepts by the Soil Taxonomy prior to 1999, but no equivalent large group was created for high-OC soils in the new Ustepts suborder. Dystrusepts developed on different materials, relief and vegetation. Their properties are closely related with the parent material. Soils developed on transported deposits or sediments have darker and thicker A horizons, a slightly acid reaction, greater CEC and OC contents than upland slope soils. Based on the previous classification into large groups... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Classification; Inceptisols; Organic carbon. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600026 |
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| Reis,Diony Alves; Lima,Cláudia Liane Rodrigues de; Bamberg,Adilson Luís; Ribeiro,Pablo Lacerda. |
| ABSTRACT: The southern Brazilian lowlands have been historically used for flooded rice cultivation. Over time, heavy machinery and intensive tillage practices have resulted in soil structure disruption, soil compaction, higher production costs and lower agricultural profitability. This study aimed to evaluate the effect of different deployment times of no-tillage (NT). Soil properties including bulk density (BD), compression index (CI), preconsolidation pressure (σp), bulk density at preconsolidation pressure (BDσp), degree of compactness (DC), soil water retention curve (SWRC), plant available water (PAW) and total organic carbon (TOC) content were evaluated using a 30-yr non-cultivated field (NC), adjacent to the experimental plots as a control. The BD,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lowlands; Preconsolidation pressure; Degree of compactness; Organic carbon. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500393 |
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| Andrade,Emilene; Miyazawa,Mário; Pavan,Marcos A.; Oliveira,Edson L. de. |
| The objective of this study was to re-evaluate some aspects of the relative importance of organic matter on Mn solubility in acid soil conditions. Field study showed that black oats, oil seed radish, elephant grass, lupin, leucaena, and coffee leaves serving as mulch decreased Mn solubility as compared with bare soil. The decrease in Mn solubility with plant mulch was related to increase in soil moisture content. Laboratory study showed that increasing temperature from 25 to 100ºC increased Mn solubility and total soil organic carbon was little changed; from 150 to 200ºC increased both Mn solubility and organic carbon oxidation, and up to 300ºC decreased Mn solubility and stoped organic carbon oxidation . Aluminum solubility always increased with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant residue; Mulch; Organic carbon; Heavy metal; Micronutrient. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000100003 |
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| TAKESHITA,V.; MENDES,K.F.; ALONSO,F.G.; TORNISIELO,V.L.. |
| ABSTRACT: With extensive use of herbicides in agricultural areas, the risk of contamination of groundwater and surface water by these products has become a worldwide concern. Practices of application or maintenance of soil organic residues that have begun to be used in agriculture for soil nutrition have demonstrated other benefits besides nutrient supplementation, such as reduced mobility and increased soil degradation of herbicides. Because it is the final destination of herbicides, soil and its constituents, especially organic matter in tropical soils, play a prominent role in processes that encompass the dynamics of herbicide molecules. In this context, it is necessary to know the influence of the organic matter and its constituents on the behavior of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorption; Mobility; Biodegradation; Organic carbon. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100304 |
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| CONZ, R. F.; ABBRUZZINI, T. F.; ANDRADE, C. A. de; MILORI, D. M. B. P.; CERRI, C. E. P.. |
| Pyrolysis temperature and feedstock type used to produce biochar influence the physicochemical properties of the obtained product, which in turn display a range of results when used as soil amendment. From soil carbon (C) sequestration strategy to nutrient source, biochar is used to enhance soil properties and to improve agricultural production. However, contrasting effects are observed from biochar application to soil results from a wide range of biochar?s properties in combination with specific environmental conditions. Therefore, elucidation on the effect of pyrolysis conditions and feedstock type on biochar properties may provide basic information to the understanding of soil and biochar interactions. In this study, biochar was produced from four... |
| Tipo: Separatas |
Palavras-chave: C Sequestration; GHG; Char; Organic carbon; Biocarvão; Pirólise; Biochar; Carbon sequestration; Pyrolysis. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1080700 |
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| Registros recuperados: 54 | |
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