Consulta: subjectFacets:"Organic matter"
Registros recuperados: 174
Data/hora: 10/06/2024 15:13:56

Compostagem de cama de aviário e seus efeitos na ocorrência da hérnia das crucíferas
Provedor de dados: 196
Autores: de Oliveira Lima, Jéssica; dos Santos, Carlos Antônio; da Costa Barros de Souza, Camila; Luiza Batalha Xavier, Cíntia; Moura Brasil do Amaral Sobrinho, Nelson; Goréte Ferreira do Carmo, Margarida Goréte Ferreira.
This study aimed to evaluate the effects of the application of poultry litter with different composting times on the occurrence of clubroot and the development of cauliflower plants. Plots inoculated with Plasmodiophora brassicae (Pb) and fertilized with non-composted poultry litter (PL-0 + Pb) and with poultry litter composted for 15 (PL-15 + Pb) and 30 days (PL-30 + Pb), were tested. As control treatments, we used inoculated plots without poultry litter (Control + Pb), non-inoculated plots (NI) and treated with composted poultry litter for 30 days (PL-30 - NI), and without poultry litter (Control - NI). The degree of stabilization and maturation of the poultry litter affected the severity of the clubroot, the volume and mass of healthy roots and galls,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. botrytis; Plasmodiophora brassicae; Compost; Organic matter; Suppressiveness; Brassica oleracea var. botrytis; Plasmodiophora brassicae; Composto; Matéria orgânica; Supressividade.
Ano: 2022
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6806

DECOMPOSITION OF THE REMAINING STRAW DURING SOYBEAN GROWING IN THE MIDWESTERN PARANÁ, BRAZIL
Provedor de dados: 196
Autores: Wenneck, Gustavo Soares; Saath, Reni; Araujo, Larissa Leite de; Pereira, Gustavo Lopes; Rezende, Roberto; Wenneck, Guilherme Soares.
Crop biomass plays an important role, especially in tropical and subtropical crops that adopt the no-tillage system, whose decomposition is related to material composition and environmental conditions. The objective of this work was to analyze the decomposition of straw remaining from autumn/winter crops in the development of soybean in succession in the Midwest region of Paraná. The experiment was conducted between 2019 and 2021 in a completely randomized design, with eight treatments (spontaneous, black oat, brachiaria, corn, wheat, oilseed radish, corn + brachiaria, and black oat + oilseed radish) and four replications. After autumn/winter cultivation, biomass samples were dried and placed in nylon bags, returning to the original plot during soybean...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Land cover; Organic matter; No-tillage system; Cobertura de solo; Matéria orgânica; Sistema plantio direto.
Ano: 2021
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6534

Balance de carbono y tasa de descomposición de mantillo y horizontes de fermentación de suelos forestales.
Provedor de dados: 32
Autores: Barrales Brito, Edgar.
El mantillo y horizontes de fermentación (CF) es un reservorio dinámico de carbono (C) en suelos forestales. Las metodologías que cuantifican la emisión de CO2 por la descomposición son escasas y requieren periodos largos de medición. Se requieren métodos para poder generar información de la emisión de CO2 de éstas capas orgánicas en tiempos cortos de medición. Los objetivos fueron: generar un protocolo para la medición de la emisión de CO2 por la descomposición de mantillo y CF con un respirómetro manométrico (OxiTop ®). Medir los reservorios de C de mantillo y CF de bosques con diferentes condiciones. Medir la emisión de CO2 del mantillo y CF y las tasas de descomposición con un respirómetro. Analizar las características químicas de los mantillos y...
Palavras-chave: Biogeoquímica; Emisión de CO2; Respirometría; Materia orgánica; Bosques; Biogeochemistry; CO2 emissions; Respirometry; Organic matter; Forest; Edafología; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/2096

Distribución espacial de nematodos agalladores (Meloidogyne spp.), y su relación con factores edáficos en la Vega de Metztitlán, Hidalgo, México
Provedor de dados: 32
Autores: Hernández Flores, Benjamín.
México ocupa el onceavo lugar a nivel mundial como productor de jitomate (Lycopersicon esculentum Mill.), con una producción de 2.15 millones de toneladas (1.7% del total mundial), sin embargo es el segundo comercializador del producto en el mundo con aproximadamente 895,126 toneladas métricas, solo después de España que exporta 1,023,028 toneladas métricas. En México, el jitomate es una de las hortalizas de mayor importancia por el valor de su producción y superficie cultivada. Según cifras del SIAP-SAGARPA la superficie total cosechada durante el año de 2004 fue de 71,502.3 hectáreas y una producción total de 2.3 millones de toneladas, con un valor de la producción de 14,375.6 millones de pesos. En México los principales productores son: Sinaloa, Baja...
Tipo: Tesis
Palavras-chave: M. incognita; M. arenaria; M. javanica; M. hapla; Textura de suelos; Materia orgánica; PH; Conductividad eléctrica; Meloidogyne spp.; Distribución espacial; Maestría; Fitopatología; Soil texture; Organic matter; Electrical conductivity; Spatial distribution.
Ano: 2007
URL: http://hdl.handle.net/10521/1584

FUZZY MODELING IN ORANGE PRODUCTION UNDER DIFFERENT DOSES OF SEWAGE SLUDGE AND WASTEWATER
Provedor de dados: 70
Autores: Putti,Fernando F.; Lanza,Marcio H.; Filho,Hélio G.; Cremasco,Camila P.; Souza,Angela V.; Gabriel Filho,Luís R. A.
ABSTRACT The present work aimed to develop mathematical fuzzy models to evaluate the effects of different doses of sewage sludge and irrigation with wastewater and potable water. Such models were elaborated from an experiment carried out at the Faculty of Agronomic Sciences, in the Department of Soil and Environmental Resources, from the Sao Paulo State University, in Brazil. The experiment was carried out in a randomized block design, in a 6 × 2 factorial scheme, with 6 doses of sewage sludge (0, 25, 50, 75, 100 and 125 of the recommended dose of N), and in the presence and absence of wastewater. In the development of the fuzzy model, the Mamdani method was used for the defuzzification. As input variables, the doses of sewage sludge and the types of water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fuzzy logic; Organic matter; Biosolid; Reuse water; Mamdani method.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000200204

Start-up of anaerobic reactors for slaughterhouse wastewater treatment
Provedor de dados: 70
Autores: FIA,RONALDO; PEREIRA,ERLON L.; FIA,FÁTIMA R. L.; EMBOABA,DÉBORA G.; GOMES,EMANUEL M.
This study aimed to evaluate the start-up of a horizontal anaerobic fixed bed reactor (HAFBR) followed by an upflow anaerobic sludge blanket (UASB) for the slaughterhouse wastewater treatment. HAFBR was filled with bamboo rings and had 1.2 m in length, 0.10 m in diameter and volume of 7.5 L. The UASB had the volume of 15 L. The HAFBR and UASB operated at organic loading rate and hydraulic retention time average of 8.46 and 3.77 kg m-3 d-1 of COD and 0.53 and 0.98 days, respectively. During 150 days of monitoring system it was found pH 6.8, relatively high values of bicarbonate alkalinity (&gt; 1000 mg L-1) and reduced values of volatile acids (70 to 150 mg L-1), which afforded average removal efficiencies of COD total and total suspended solids of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: UASB; Anaerobic filter; Slaughterhouse; Organic matter.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162015000200331

Atrazine bound residues formation and dissipation in subtropical soil under swine wastewater application
Provedor de dados: 70
Autores: Gonçalves,Morgana S.; Sampaio,Silvio C.; Coelho,Silvia R. M.; Suszek,Floriano L.; Cordovil,Claudia M. D. S.
The effects of swine wastewater on atrazine dissipation and formation of bound residues in subtropical clay soil were investigated in this study. The experiment was carried out in laboratory, under room conditions, where samples of Rhodic Hapludox soil received 168.61 mg kg-1 of atrazine and were incubated for 60 days in the following treatments: T1 (sterilized soil + swine wastewater), T2 (sterilized soil + distilled water), T3 (Non sterilized soil + swine wastewater) and T4 (Non sterilized soil + distilled water). The extractable residues and bound residues of atrazine were extracted and analyzed by high performance liquid chromatography. The results showed no effect of swine wastewater on atrazine dissipation. However, the addition of swine wastewater...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide; Degradation; Sorption; Organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600017

Dosages of bokashi in the control of Meloidogyne javanica in lettuce, in greenhouse
Provedor de dados: 75
Autores: Ferreira,Júlio CA; Hernandes,Isabela; Brito,Olívia DC; Cardoso,Michelly R; Dias-Arieira,Claudia R.
ABSTRACT Root-knot nematodes are among the major phytosanitary problems on vegetables, and the use of organic matter can be a viable method to control this parasite. Thus, in the present study we aimed to investigate in a greenhouse the use of bokashi doses (organic compound produced by fermentation of grain mixtures) in the control of Meloidogyne javanica in lettuce. Substrate infestation was carried out using tomato seedlings transplanted into pots containing 2 kg of autoclaved soil and inoculated with 2000 eggs and eventual second stage juveniles. After 60 days, the aerial part of the tomato plant was discarded and lettuce seedlings of cv. Vera were transplanted, adding bokashi at doses of 0, 5, 10 and 20 g/pot. One second treatment consisted in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lactuca sativa; Organic matter; Root-knot nematode; Management.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362017000200224

Phosphorus sources associated with organic compound in broccoli production and soil chemical attributes
Provedor de dados: 75
Autores: Cardoso,Antonio Ismael Inácio; Silva,Priscilla Nátaly de L; Colombari,Lidiane F; Lanna,Natália BL; Fernandes,Dirceu M.
ABSTRACT Phosphorus is a finite natural resource and the use of gradual-release phosphate sources, associated with an organic compound may favor a more rational use of this nutrient, since organic matter protects P from soil fixation. The aim of this study was to evaluate the effect of phosphorus sources application, associated with organic compound at planting, on single inflorescence type broccoli production and soil chemical properties at the end of the cycle. Eight treatments were evaluated, in a 4 x 2 factorial scheme, using four phosphorus sources [thermophosphate (TM), natural phosphate (NP), reactive natural phosphate (RNP) and triple superphosphate (TSP)]; in the presence (55 t ha-1) and absence of organic compound Visafértil® at planting. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea var. italica; Phosphate fertilization; Organic matter; Productivity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000200228

Химический состав органического вещества в перифитоне системы гидробиологической очистки морской воды
Provedor de dados: 13
Autores: Гапонюк, Т. О.
Впервые получены данные об органическом веществе в перифитоне системы гидробиологической очистки морской воды. Установлено, что количество белка находилось в пределах 0.5 – 2.5 мг/100 мг, аминокислот 0.01 – 0.9 мг/100 мг, углеводов 2.0 – 7.0 мг/100 мг, липидов 1.6 – 7.1 мг/100 мг, нуклеиновых соединений (свободные нуклеотиды, РНК, ДНК) 0.7 – 2.3 мг/100 мг, углеводородов 2.8 – 4.2 мг/100 мг. Количество нефтяных углеводородов в среднем составляло 1.6 мг/100 мг. Отмечено преобладание количества липидно-углеводородного комплекса над остальными компонентами химического состава перифитона за период с января по август 2005 г. и выявлена корреляция между содержанием углеводородов и нефтяных углеводородов, с одной стороны, и количеством липидов, с другой (средний...
Tipo: Journal Contribution
Palavras-chave: Перифитон; Органическое вещество; Система гидробиологической очистки; Черное море; Periphyton; Organic matter; System of water hydrobiological purification; Black Sea Water purification Periphyton Organic matter Periphyton Organic matter Water purification http://aims.fao.org/aos/agrovoc/c_5709 http://aims.fao.org/aos/agrovoc/c_5387 http://aims.fao.org/aos/agrovoc/c_34145.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/310

Переход органических веществ из прибрежных наносов в морскую воду
Provedor de dados: 13
Autores: Миронов, О. Г.; Муравьева, И. П.; Гапонюк, Т. О.; Замыслова, Т. Н.
Впервые приведены данные о количестве органических веществ, переходящих с минеральных частиц наносов в морскую воду в результате гидродинамического воздействия, для прибрежных наносов (Севастопольская бухта, Черное море). Отмечено, что количество органических веществ во взвеси в десятки и сотни раз выше, чем определяемое стандартным методом органическое вещество на поверхности минеральных частиц грунта.
Tipo: Journal Contribution
Palavras-chave: Прибрежные наносы; Органическое вещество; Белки; Липиды; Углеводы; Marine deposits of littoral line; Organic matter; Proteins; Lipids; Carbohydrates Carbohydrates Lipids Proteins Organic matter Carbohydrates Organic matter Lipids Proteins http://aims.fao.org/aos/agrovoc/c_1300 http://aims.fao.org/aos/agrovoc/c_5387 http://aims.fao.org/aos/agrovoc/c_4362 http://aims.fao.org/aos/agrovoc/c_6259.
Ano: 2004
URL: http://repository.ibss.org.ua/dspace/handle/99011/96

Biometry of neotropical invertebrates inhabiting floodplain rivers: unraveling bionomy
Provedor de dados: 76
Autores: Zilli,Florencia; Barco,Julia del; Vanzetti,Agustín.
ABSTRACT Currently, it is widely recognized that invertebrates play key roles in neotropical floodplains and in many other environments worldwide. However, little information has been published concerning their biometry, in spite that it represents an essential tool for many different studies. Here, we provided length-mass and length-length relationships by fitting the linearized model (log10 Y = log10a + b log10 X) and several mean biomass ratios ± SE for bivalves, gastropods, quironomids, ephemeropterans, oligochaetes and hirudineans. We measured, weighed, oven dried and incinerated to ashes specimens collected from 2005 to 2014 in the Paraná River, Argentina. The lineal equations had fit levels higher than 75% in most of the significant regressions....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Allometry; Organic matter; Paraná River; Wetlands; Benthos; Pleuston.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100214

Reproductive biology of the swimming crab Achelous spinimanus (Decapoda, Portunoidea): a potential fishing resource
Provedor de dados: 76
Autores: Sousa,Aline N.; Bernardes,Veronica P.; Bernardo,Camila H.; Taddei,Fabiano G.; Teixeira,Gustavo M.; Costa,Rogério C.; Fransozo,Adilson.
ABSTRACT This study describes the reproductive and recruitment patterns of the swimming crab Achelous spinimanus (Latreille, 1819) in the Ubatuba region of the northern coast of São Paulo, Brazil. Crabs were captured monthly from January 1998 to December 1999 in 18 sites located in three bays (Ubatumirim, Ubatuba, and Mar Virado), using a commercial fishing boat. In each sampling area, bottom temperature, salinity, and organic matter content were recorded. A total of 1,911 individuals were captured: 350 adult males, 475 non-ovigerous adult females, 584 adult ovigerous females, and 502 immature individuals. Reproductive females were more abundant in deeper areas; this migration might be a strategy to improve larval dispersion and survival. Ovigerous females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fishing; Organic matter; Recruitment; Temperature; Ubatuba.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100210

Compostagem de resíduos da produção e abate de pequenos ruminantes.
Provedor de dados: 14
Autores: OLIVEIRA, E. L. de; RODRIGUES, G. de S.; SANTIAGO, L. B.; SOUZA, H. A. de.
A compostagem se enquadra no processo biológico de reciclagem de nutrientes e surge como uma alternativa viável por reduzir o peso e o volume dos resíduos gerados. A compostagem é uma técnica de decomposição e sanitização da matéria orgânica à alta temperatura, pela ação de bactérias e fungos que transformam as carcaças em um produto útil, denominado de composto orgânico. Essa técnica é acessível ao produtor rural e as agroindústrias, tais como frigoríficos e abatedouros. O composto orgânico é um adubo que pode ser utilizado em áreas agrícolas, conforme Instrução Normativa nº 25 de 2009 do Ministério da Agricultura, Pecuária e Abastecimento, que trata da produção e do uso de compostos orgânicos. O uso de composto orgânico apresenta as vantagens de reduzir...
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Resíduo de carcaça; Carcass utilization; Carcasses; Waste.; Composto orgânico; Compostagem; Matéria orgânica; Decomposição; Manejo; Caprino; Ovino; Organic compounds; Composting; Organic matter; Degradation; Goats; Sheep.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1019361

Retorno ao solo de nutrientes de serrapilheira de Eucalyptus cloeziana no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
RESUMO: O objetivo deste trabalho foi comparar procedências de Eucalyptus cloeziana quanto à queda de serrapilheira e aos nutrientes potencialmente retornáveis ao solo por essa via no Cerrado, em Planaltina-DF. O experimento foi implantado em um Latossolo Vermelho, argiloso, distrófico a uma altitude de 1000 m. As procedências avaliadas foram: 11008 de Coominglah; 11666 de Cooktown e 11949 de Fraser Island, todas de Queensland, Austrália. No centro das parcelas de 7x7 plantas colocaram-se coletores de 1x1m, ao nível do solo. De setembro de 1995 a agosto de 2000, mensalmente, o material foi recolhido e separado em folhas, galhos, frutos e casca e determinando a matéria seca. Antes da separação retirava-se uma amostra do material para determinação dos teores...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Cycling.; Carbono; Cerrado; Eucalipto; Fertilidade do Solo; Matéria Orgânica; Nutriente; Serapilheira.; Reflorestamento; Carbon; Organic matter; Reforestation; Nutrients; Soil fertility.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567965

Alternativas para substituição parcial do esterco na vermicompostagem.
Provedor de dados: 14
Autores: AQUINO, A. M. de; DE-POLLI, H.; ALMEIDA, D. L. de.
Minhocas. Resíduos orgânicos e vermicompostagem. Preparo do vermicomposto. Roteiro para preparação do vermicomposto.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Vermicompostagem.; Esterco; Matéria Orgânica; Minhoca; Resíduo Orgânico.; Lumbricidae; Oligochaeta; Composting; Organic fertilizers; Organic matter; Vermicomposting.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/623409

Sistema plantio direto de meloeiro com coquetéis vegetais em Vertissolo no Semiárido.
Provedor de dados: 14
Autores: GIONGO, V.; BRANDÃO, S. da S.; SANTANA, M. da S.; COSTA, N. D.; MENDES, A. M. S.; YURI, J. E.; PETRERE, C.
O melão (Cucumis melo L.) é uma cultura de grande importância econômica para o Brasil, sendo a terceira fruta fresca mais exportada no país. O cultivo do meloeiro está em expansão nos estados de Pernambuco e Bahia. Entretanto, o sistema de cultivo atualmente preconizado envolve o intensivo preparo do solo com a utilização de arações, gradagens e o preparo de camalhões. Tais práticas de manejo aceleram o processo de degradação do solo e favorecem a salinização das áreas de cultivo. Práticas conservacionistas como a utilização de culturas de cobertura e o reduzido revolvimento do solo são incorporadas ao conceito de sistema plantio direto. Para ajustar um modelo tecnológico de sistema plantio direto de meloeiro, em Vertissolos para o Vale do São Francisco, e...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Cucunis melo; Coquetel vegetal.; Melão; Adubação verde; Matéria orgânica; Manejo do solo; Carbono; Nutriente.; Organic matter; Melons; Green manures.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1012770

Emissões de NO, N2O e CO2 em agroecossistemas do Cerrado.
Provedor de dados: 14
Autores: CARVALHO, A. M. de; BUSTAMANTE, M. M. da C.
ABSTRACT: In the last 30 years, the Cerrado Biome has suffered very intense conversion of its native vegetation into croplands (Brazilian Savanna). This habitat modification has contributed with 25% and 90% of the total CO2 and N2O anthropogenic emission respectively. Soil preparation (tillage and no-tillage), deposition of crop residues, cultivation of N-fixing species and nitrogen fertilization are management practices that influence trace gas fluxes from soil to atmosphere. Nevertheless, the interaction between such practices and NO, N2O and CO2 fluxes in the Cerrado region is still unclear. Raining events after the dry season results in NO and CO2 pulses. The interaction between nitrogen application-during rain events affects NO and CO2 emissions. The...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Carbono; Conservação do Solo; Efeito Estufa; Gás; Matéria Orgânica.; Manejo do Solo; Gases; Carbon; Greenhouse effect; Organic matter; Soil conservation; Soil management.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572290

Alterações na matéria orgânica e nas características químicas de um Podzol hidromórfico sob pastagens cultivadas no Pantanal Sul-Mato-Grossense.
Provedor de dados: 14
Autores: 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

Ciclagem de carbono em ecossistemas terrestres: o caso do cerrado brasileiro.
Provedor de dados: 14
Autores: ADUAN, R. E.; VILELA, M. de F.; KLINK, C. A.
ABSTRACT: In the Cerrado Biome, the internal carbon cycling, the main carbon pools size, and the fluxes intensity between carbon pools are far from to be completely understood. This study presents the main carbon pools and cycling fluxes in terrestrial ecosystems, emphasizing the neotropical savannas. This study will also review literature of internal carbon cycling in the Cerrado. In spite of the science advances, the knowledge of internal carbon dynamics in the Cerrado are scarce. The relation between the carbon pools size and fluxes intensity and the Cerrado's vegetation phytofisionomies, soil gradient, and climate still remains unknown. The carbon pools and fluxes data analysis show that the Cerrado's aerial carbon pools are smaller than the forest...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Fluxo de carbono; Carbon fluxes; Carbon cycling.; Biomassa; Cerrado; Matéria Orgânica; Serapilheira; Solo.; Biomass; Organic matter; Soil.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569012

Resumos expandidos.
Provedor de dados: 14
Autores: ENCONTRO BRASILEIRO DE SUBSTÂNCIAS HÚMICAS, 6., 2005, Rio de Janeiro.
Aplicação na agricultura; aplicações diversas; aspectos estruturais, caracterização e métodos de estudo; substâncias húmicas e humanidades; substâncias húmicas e o meio ambiente; substâncias húmicas em sistemas aquáticos.
Tipo: Anais e Proceedings de eventos
Palavras-chave: Substâncias húmicas; Matéria Orgânica; Carbono; Organic matter; Carbon; Humic substances.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/338634

Melhorando a qualidade dos sistemas produtivos.
Provedor de dados: 14
Autores: SALTON, J. C.; TOMAZI, M.
bitstream/item/218500/1/SOLO-VIVO-P.-50.pdf
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Atributos físicos do solo; Physical soil attributes; Qualidade; Manejo do Solo; Matéria Orgânica; Management systems; Organic matter.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1127365

Soil fauna and litter decomposition in primary and secondary forests and a mixed culture system in Amazonia.
Provedor de dados: 14
Autores: HÖFER, H.; MARTIUS, C.; BECK, L.; GARCIA, M. V. B.
Este relatório representa um relato das atividades efetuadas no segundo ano do projeto como também dos resultados obtidos dos dados de 1997-1998 e da primeira serie de experimentos de decomposição com sacos de liteira (serrapilheira). Baseado nos resultados ainda preliminares, as áreas de estudo podem ser organizadas numa série, começando da área de floresta primária FLO via um dos locais de plantação, POC, até o local de floresta secundária, SEC, e o segundo local de plantação, POA.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Tropical rain forest; Decomposição; Floresta Tropical Úmida; Matéria Orgânica; Solo; Degradation; Organic matter; Soil.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/668179

Retorno, ao solo, de nutrientes de serrapilheira de pinus no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK. D. V. S.
bitstream/CPAC-2009/24656/1/bolpd_75.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Pinus caribea; Carbono organico; Cycling.; Cerrado; Fertilidade do Solo; Matéria Orgânica; Nutriente; Reflorestamento; Serapilheira.; Carbon; Nutrients; Organic matter; Reforestation; Soil fertility.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559118

Mudança no conteúdo de matéria orgânica do solo sob a cultura de cana-de-açúcar e pastagem em argissolo de Conceição da Barra-ES.
Provedor de dados: 14
Autores: CAMPOS, D. V. B. de; BRAZ, S. P.; MACHADO, P. L. O. de A.; SANTOS, G. A. dos; LIMA, E.; ALVES, B. J. R.; BODDEY, R. M.; URQUIAGA, S.
Caracterização da área. Metodologia. Densidade do solo. Teores de carbono e relação C:N.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Densidade do solo; Sugar cane.; Cana de Açúcar; Matéria Orgânica; Pastagem; Solo.; Pastures; Organic matter; Soil; Soil density.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/627823

Manejo do palhiço residual n a cultura de cana-de-açúcar no Cerrado: primeira aproximação.
Provedor de dados: 14
Autores: SA, M. A. C. de; FRANZ, C. A. B.; SANTOS JUNIOR, J. de D. G. dos; REIN, T. A.; BUFON, V. B.; CARVALHO, A. M. de; MULLER, A. G.
bitstream/item/131266/1/cirtec-27.pdf
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Goiás; Cana-de-açúcar; Agroenergia; Brasil; Decomposition; Second-generation ethanol; Savanna.; Colheita mecânica; Cana de açúcar; Canavial; Palha; Latossolo vermelho; Cerrado; Colheita; Conservação do Solo; Decomposição; Matéria Orgânica; Saccharum Officinarum.; Brazil; Bioenergy; Harvesting; Organic matter; Soil conservation; Straw; Sugarcane.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1026337

Produção de "litter" e seu conteúdo de nutrientes em floresta primária e capoeira da Amazônia Oriental.
Provedor de dados: 14
Autores: DANTAS, M.
bitstream/item/57922/1/Doc40-p147-162.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Produção de liteira; Produtividade primária; Capitão Poço; Pará; Brasil; Plant soil relations.; Ecossistema; Matéria Orgânica; Nutriente; Relação Solo-Planta.; Amazonia; Forest litter; Ecosystems; Organic matter; Primary productivity.; Nutrients.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/394726

Espécies vegetais para produção de cobertura morta de solo, em plantio no outono, sem irrigação, na região de São Carlos, SP.
Provedor de dados: 14
Autores: PRIMAVESI, O.; PRIMAVESI, A. C.; NOVAES, N. J.
bitstream/CPPSE/11330/1/PROCIComT16OP1996.00133.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Matéria Orgânica; Irrigação; Solo.; Irrigation; Organic matter; Soil.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/43370

Retorno ao solo de nutrientes de serrapilheira de Eucalyptus camaldulensis no cerrado do Distrito Federal.
Provedor de dados: 14
Autores: MELO, J. T. de; RESCK, D. V. S.
RESUMO: O objetivo deste trabalho foi comparar procendências de Eucalyptus camaldulensis quanto à queda de serrapilheira e o retorno de nutrientes ao solo por essa via, no cerrado, em Planaltina-DF. O experimento foi em uma área localizada a 1000 m de altitude.O solo é Latossolo Vermelho Ditrófico típico textura argilosa. As argilosa. As procedências avaliadas foram: 10911 de Emu Creek, Queensland; 9856 de Agnew Road, West Autralian e 10557 de Kimberly Area, West Australian. No centro das parcelas de 7 x 7 plantas, colocaram-se coletores de 1,0 x 1,0 m, ao nível do solo. De setembro de 1995 a agosto de 2000, mensalmente, o material foi recolhido e separado em folhas, galhos, frutos cascas e determinada matéria seca. Antes da separação, retirava-se uma...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Ciclagem; Cycling.; Carbono; Eucalipto; Fertilidade do Solo; Matéria Orgânica; Nutriente; Serapilheira.; Reflorestamento; Carbon; Organic matter; Reforestation; Nutrients; Soil fertility.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568115

Predição dos teores de carbono e nitrogênio do solo utilizando espectroscopia de infravermelho próximo.
Provedor de dados: 14
Autores: MARCHAO, R. L.; BECQUER, T.; BRUNET, D.
A espectroscopia de reflectância no infravermelho próximo foi utilizada para prever os teores totais de carbono e nitrogênio do solo. Amostras de solo foram escaneadas em um instrumento monocromador.
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Espectro; Multivariate calibration; M-PLS; NIRS; Soilchemistry; Redlatosol.; Análise do Solo; Matéria Orgânica; Latossolo Vermelho; Química do Solo; Solo.; Organic matter; Soil organic matter.; Soil analysis.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/942405

Parametros fisicos dos solos da regiao dos cerrados.
Provedor de dados: 14
Autores: RESCK, D. V. S.
bitstream/item/98699/1/bolpd-02.pdf
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Brasil; Região do Cerrado; Soil chemicophysical; Soil chemicophysical properties.; Cerrado; Física do Solo; Granulometria; Matéria Orgânica; Solo.; Organic matter; Soil.; Savannas.
Ano: 1981
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/549437

Degradação de pastagens, matéria orgânica do solo e a recuperação do potencial produtivo em sistemas de baixo "input" tecnológico na região dos cerrados.
Provedor de dados: 14
Autores: BRAZ, S. P.; URQUIAGA, S.; ALVES, B. J. R.; BODDEY, R. M.
Matéria orgânica do solo; Rebrota da pastagem; Compactação do solo; Deficiência de nitrogênio; Resposta das pastagens a adubação com nitrogênio; Sistemas extensivos de prdução pecuária.
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Degradação de Pastagem; Deficiência de nitrogênio; Deterioração de Pastagem; Pasture degradation; Pasture deterioration; Nitrogen deficiency.; Matéria Orgânica; Solo.; Organic matter; Soil.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/627822

Cultivo orgânico do café: recomendações técnicas.
Provedor de dados: 14
Autores: RICCI, M. dos S. F.; ARAÚJO, M. do C. F.; FRANCH, C. M. de C.
Agricultura alternativa e agricultura convencional. Fundamentos da agricultura orgânica. A cafeicultura, segundo os princípios da agricultura orgânica. Escolha da espécie e das cultivares adequadas. Formação das mudas. Preparo da área de plantio. Correção do solo. Fontes de matéria orgânica e de nutrientes. Estercos. Compostagem. Vermicompostagem. Cobertura morta do solo. Cobertura viva do solo e adubos verdes. Biofertilizantes. Espaçamento e densidade de plantio. Controle alternativo de fitopatógenos e pragas do cafeeiro. Controle de fitopatógenos. Controle de pragas, ácaros e nematóides. Controle de plantas invasoras. Arborização ou sombreamento de cafezais. Conversão de lavouras convencionais em orgânicas. Certificação e comercialização de café orgânico.
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Agricultura natural; Vermicompostagem; Cobertura viva; Fitopatologia; Planta invasora; Coffee; Alternative agriculture; Planting density; Spacing; Cultural practices; Cultural methods; Phytopathology; Plant diseases; Nematodes; Revegetation.; Agricultura Alternativa; Ácaro; Adubo Orgânico; Agricultura Orgânica; Biofertilizante; Arborização; Café; Compostagem; Cobertura Morta; Comercialização; Densidade de Plantio; Doença de Planta; Esterco; Erva Daninha; Nematóide; Matéria Orgânica; Nutriente; Praga; Pratica Cultural; Solo; Sombreamento.; Acarus; Lumbricidae; Nematoda; Composting; Biofertilizers; Organic fertilizers; Organic matter; Plant pathology; Mulching; Nutrients; Soil; Vermicomposting.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/622689

Diagnóstico da fertilidade do solo em áreas de sequeiro de agricultores familiares em municípios do Sertão dos Inhamuns, Ceará.
Provedor de dados: 14
Autores: SOUZA, H. A. de; CAVALCANTE, A. C. R.; TONUCCI, R. G.; POMPEU, R. C. F. F.; SOUZA, M. C. M. R. de.
bitstream/item/126439/1/cnpc-2015-Cot-145.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Semiárido; Brasil; Região Nordeste; Análise do solo; Fertilidade do solo; Matéria orgânica; Nutriente; Agricultura familiar; Comunidade rural; Caatinga; Soil analysis; Soil fertility; Organic matter; Nutrients; Rural communities; Semiarid soils; Brazil.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1019645

A decomposição da matéria orgânica.
Provedor de dados: 14
Autores: DENICH, M.; BRANDINO, Z. G.; BLUM, E.
bitstream/item/57923/1/Doc40-p163-186.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Biologia solo; Igarapé-Açu; Pará; Brasil.; Decomposição; Ecossistema; Matéria Orgânica.; Amazonia; Degradation; Ecosystems; Organic matter; Soil biology.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/394727

Sistema plantio direto: o produtor pergunta, a Embrapa responde.
Provedor de dados: 14
Autores: SALTON, J. C.; HERNANI, L. C.; FONTES, C. Z.
Introdução; Conceitos, Adoção, Palha; Manejo do material orgânico; Culturas, sucessões e rotações; Água e temperatura no solo; Biologia do solo; Compactação do solo; Terraços; Correção do solo; Adubação; Coleta de amostras de solo e de planta; Mecanização; Tecnologia de aplicação de defensivos agrícolas; Plantas daninhas e seu controle; Manejo de pragas; Manejo de doenças; Integração agricultura-pecuária; Custos de produção; Agricultura de precisão.
Tipo: Col Criar Plantar ABC 500P/500R Saber (INFOTECA-E)
Palavras-chave: Adubação; Agricultura de Precisão; Biologia do Solo; Cerrado; Compactação do Solo; Custo de Produção; Doença de Planta; Matéria Orgânica; Mecanização Agrícola; Plantio Direto; Rotação de Cultura; Sistema de Cultivo; Tecnologia; Disease control; Fertilizer application; No-tillage; Organic matter; Pesticides; Soil biology; Technology; Weed control.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1124531

Fertilizantes.
Provedor de dados: 14
Autores: MESSIAS, A. S.; SILVA, D. J.; FREIRE, F. J.; SILVA, M. C. L. da.
Nitrogenados; Fosfatados; Potassicos; Organicos; Micronutrientes; Fertilizantes simples e formulacoes comerciais; Epocas e modos de aplicacao de fertilizantes.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Micronutriente; Adubo; Corretivo; Fertilizante; Fósforo; Matéria Orgânica; Nitrogênio; Potássio; Solo; Fertilizer application; Nitrogen; Organic matter; Phosphorus; Potassium; Trace elements; Soil.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/132544

Dinamica do carbono da biomassa microbiana em cinco profundidades de um latossolo no cerrado sob diferentes sistemas de manejo.
Provedor de dados: 14
Autores: FERREIRA, E. A. B.; RESCK, D. V. S.; GOMES, A. C.; RAMOS, M. L. G.
bitstream/CPAC-2009/24364/1/p2002_29.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Biomassa; Cerrado; Manejo do Solo; Matéria Orgânica; Química do Solo; Solo.; Biomass; Organic matter; Soil chemistry; Soil; Soil management.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567663

Microrganismos de processos biológicos do solo: perspectiva ambiental.
Provedor de dados: 14
Autores: SIQUEIRA, J. O.; MOREIRA, F. M. de S.; GRISI, B. M.; HUNGRIA, M.; ARAUJO, R. S.
Organismos e processos biologicos do solo; Ciclagem dos elementos no solo; Aspectos biologicos da degradacao do solo; Reabilitacao de solos degradados.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Microorganismos; Toxicidade do aluminio; Fixacao biologica do nitrogenio; Degradacao do solo; Brasil; Microorganism; Environmental; Biological nitrogen fixation; Mycorhiza.; Acidez; Ecologia; Matéria Orgânica; Micorriza; Microbiologia; Meio Ambiente; Solo.; Acidity; Degradation; Ecology; Brazil; Organic matter; Microbiology; Soil; Toxicity.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/449290

Soil carbon sequestration and mulch-based cropping in the cerrado region of Brazil.
Provedor de dados: 14
Autores: CORBEELS, M.; SCOPEL, E.; CARDOSO, A.; DOUZET, J-M.; SIQUEIRA NETO, M.; BERNOUX, M.
bitstream/CPAC-2009/25318/1/p2004_38.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Dinâmica; Cover plants.; Carbono; Cerrado; Matéria Orgânica; Planta de Cobertura; Química do Solo.; Dynamics; Carbon; Organic matter; Soil chemistry.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568320

O sistema minirhizotron no estudo da dinâmica de raízes.
Provedor de dados: 14
Autores: SANTOS JÚNIOR, J. de D. G. dos; SÁ, M. A. C. de; FERREIRA, E. A. B.; RESCK, D. V. S.; LAVRES JÚNIOR, J.
ABSTRACT: Root dynamic is an important component of agricultural e natural ecosystems. The minirhizotrons system is a multicomponent assembly used to study root dynamics in a nondestructive manner. Basically, transparent tubes are installed in the soil and the root intersections along the tube are recorded and measured with appropriated software's. In this review, the minirhizotron method was discussed based in the international literature. The potential, applications and limitations of this tool, and future uses in the Cerrado region was also discussed.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Fertilidade do Solo; Manejo do Solo; Matéria Orgânica; Raiz; Solo.; Sistema Radicular; Organic matter; Soil; Root systems; Roots; Soil fertility; Soil management.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572255

Manual de calagem e adubação do Estado do Rio de Janeiro.
Provedor de dados: 14
Autores: FREIRE, L. R.
Produtividade vegetal e fertilidade do solo; Principais classes de solo do Estado do Rio de Janeiro; Fertilidade do solo; Análise química de amostras de terra; Adubos e corretivos; Aplicação de adubos; Uso e manejo da matéria orgânica para fins de fertilidade do solo; Insumos biológicos; Manejo da fertilidade do solo na agricultura orgânica; Cultivo protegido; Cultivo hidropônico; Critérios econômicos relacionados com a seleção de adubos e corretivos; Recomendações gerais; Recomendações de adubos, corretivos e de manejo da matéria orgânica para as principais culturas do Estado do Rio de Janeiro.
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Solo; Matéria orgânica; Agricultura orgânica; Sistema de cultivo; Fertilidade do Solo; Soil; Organic matter; Cropping systems; Soil fertility.
Ano: 2013
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/963089

Soil termites in primary forest, secondary forest and an agroforestry plantation system in central Amazonia.
Provedor de dados: 14
Autores: MARTIUS, C.; GOMES, E.; GARCIA, M. V. B.
Litter and soil termites were collected with soil cores (21cm diameter) in a primary forest site, a secondary forest site and two sites of a polyculture plantation system in central Amazonia (Brazil), in three-monthly intervals from 1997 to 1999. Termite genus diversity, abundance and biomass all were highest in the primary forest. The values in the secondary forest were half those of the primary forest, and they were lowest in the plantation systems, indicating that the latter sites may suffer from functional constraints concerning the process of organic residue decomposition.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Tropical rain forest; Agrossilvicultura; Biomassa; Cultivo Multiplo; Cupim de Montículo; Decomposição; Fauna Edáfica; Floresta Tropical Úmida; Isoptera; Matéria Orgânica; Serapilheira; Termitidae; Agroforestry; Biomass; Degradation; Forest litter; Multiple cropping; Organic matter; Soil fauna.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/669561

Estoques de carbono de frações lábeis e estáveis da matéria orgânica em solos sob diferentes tempos de cultivo de eucalipto no Vale do Jequitinhonha - MG (2009).
Provedor de dados: 14
Autores: PULROLNIK, K.; BARROS, N. F. de; SILVA, I. R. da; NOVAIS, R. F. de; BRANDANI, C. B.
bitstream/item/78167/1/p2009-054.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Sivilculture; Carbon stock.; Eucalyptus Urophylla.; Organic matter; Soil.
Ano: 2009
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/748204

Efeitos da inoculação de micorriza na produção de matéria orgânica de leguminosas arboreas e arbustivas.
Provedor de dados: 14
Autores: BLUM, E.
bitstream/item/57928/1/Doc40-p245-260.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Árvore leguminosa; Produção de matéria orgânica; Absorção de nitrogênio; Absorção de fósforo; Capitão Poço; Pará; Brasil.; Inoculação; Micorriza.; Amazonia; Absorption; Inoculation methods; Legumes; Mycorrhizae; Nitrogen; Organic matter; Phosphorus; Trees.; Soil.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/394731

Dinamica do carbono da biomassa microbiana em cinco epocas do ano sob diferentes sistemas de manejo do solo no cerrado.
Provedor de dados: 14
Autores: FERREIRA, E. A. B.; RESCK, D. V. S.; RAMOS, M. L. G.; GOMES, A. C.
bitstream/CPAC-2009/24335/1/p2002_30.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Biomassa; Cerrado; Manejo do Solo; Matéria Orgânica; Química do Solo; Solo.; Biomass; Organic matter; Soil chemistry; Soil; Soil management.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567630

Dinamica da materia organica na regiao dos cerrados.
Provedor de dados: 14
Autores: RESCK, D. V. S.; PEREIRA, J.; SILVA, J. E. da.
bitstream/item/101470/1/doc-36.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Rotational cropping; Cultura; Fertilizer; Matéria; Orgânica; Rotação; Sistema.; Cerrado; Fertilidade; Matéria Orgânica; Rotação de Cultura; Solo.; Organic matter; Soil.; Savannas.
Ano: 1991
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/548002

Avaliacao da cobertura do solo proporcionada por especies vegetais na regiao do cerrado.
Provedor de dados: 14
Autores: TOFETI, A. R.; CARDOSO, A. N.; CARVALHO, A. M. de; SOUSA JUNIOR, J. G. de A.
bitstream/CPAC-2009/24355/1/p2002_10.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Cover plants.; Adubo Verde; Cerrado; Conservação do Solo; Matéria Orgânica; Planta de Cobertura; Solo.; Green manures; Organic matter; Soil; Soil conservation.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/563238

Micronutrientes no solo sob diferentes fitofisionomias no Pantanal da Nhecolândia, Mato Grosso do Sul.
Provedor de dados: 14
Autores: FREITAS, D. A. F. de; CARDOSO, E. L.; SILVA, M. L. N.; SANTOS, S. A.
O Pantanal da Nhecolândia é caracterizado por uma elevada diversidade de unidades de vegetação que apresentam diferenças na fertilidade do solo. O presente estudo objetivou avaliar a disponibilidade de micronutrientes do solo sob as diferentes fitofisionomias desta região. Amostras de solo foram coletadas na profundidade de 0-10 cm, para avaliação da disponibilidade de zinco, ferro, manganês, cobre, boro e sódio, em sete fitofisionomias sujeitas a diferentes regimes de inundação: a) livres de inundação - floresta semidecídua e cerradão; b) sujeitas a inundação ocasional ? cerrado/campo cerrado e campo limpo com predominância de Elionurus muticus; c) sujeita a inundação sazonal - campo limpo com predominância de Axonopus purpusii e Andropogon spp.; bordas...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: PH do solo; Native vegetation.; Matéria Orgânica; Vegetação Nativa.; Organic matter; Soil pH.
Ano: 2011
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/921423

Matière organique et pollution par les hydrocarbures dans les sédiments superficiels du golfe d'Arzew (mer Méditerranée, Algérie)
Provedor de dados: 5
Autores: Buscail, R; Foudil-bouras, Ae; Pauc, H.
The distribution of global organic parameters (organic carbon, nitrogen, hydrolyzable carbon) was established in surficial sediments of the Gulf of Arzew. Moreover, humic substances, humin and hydrocarbons have provided information on the organic matter origin and evolution in the identified sedimentary areas: prodeltas at the mouth of the dry rivers Cheliff and Macta; muddy mid-deposits and carbonated shallow environments. The higher organic matter concentrations characterize the muddy mid-deposits and especially the western part located near the Arzew and Bethioua harbours (TOC &gt; 0.9 %; Nt = 0.35 % d.w.). The marine origin of the organic matter is supported by low C/N ratios (5-9) in the total sediments and the position in the Van Krevelen diagram of...
Tipo: Text
Palavras-chave: Sédiment; Matière organique; Substance humique; Hydrocarbure; Marge algérienne; Sediment; Organic matter; Humic substance; Hydrocarbon; Algerian margin.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43612/43914.pdf

Mercury in the Lot-Garonne River system (France): Sources, fluxes and anthropogenic component
Provedor de dados: 5
Autores: Schafer, J; Blanc, Gerard; Audry, S; Cossa, Daniel; Bossy, C.
Dissolved and particulate Hg fluxes in the Lot-Garonne-Gironde fluvial-estuarine system were obtained from observation of daily discharge and suspended particulate matter (SPM) concentrations. In addition to the measurements of the total dissolved (&lt; 0.45 gm) and particulate Hg (&gt; 0.45 gm), called HgTD and HgTp respectively, the dissolved inorganic Hg species (HgRD) were determined monthly. Geochemical background values for HgTp in sediments and SPM were similar to crustal values and to typical concentrations in SPM of non-contaminated river systems, respectively. The Riou Mort watershed already known as the origin of important historical polymetallic (e.g., Cd, Zn) pollution was identified as an important Hg point source. In the downstream Lot...
Tipo: Text
Palavras-chave: Lot; Garonne; SPM; River; Organic matter; Mercury.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1343.pdf

Living (stained) benthic foraminifera from the Mozambique Channel (eastern Africa): Exploring ecology of deep-sea unicellular meiofauna
Provedor de dados: 5
Autores: Fontanier, Christophe; Garnier, Eline; Brandily, Christophe; Dennielou, Bernard; Bichon, S.; Gayet, Nicolas; Eugene, Thibaut; Rovere, Mickael; Gremare, A.; Deflandre, B.
Live (Rose-Bengal stained) deep-sea foraminiferal faunas have been studied at four stations between 530–3200-m depth in the Mozambique Channel (eastern Africa) to understand how complex environmental conditions (e.g., organic matter, oxygenation) control their ecological structure (i.e., diversity, density, and microhabitats). Two upper-slope stations, located at 530- and 780-m depth off Madagascar, are bathed by well-oxygenated bottom waters. They are characterized by fine sediments enriched in highly degraded organic matter (low amino-acid bio-availability and reduced chlorophyllic freshness). Mineralization of organic compounds results in relatively moderate oxygen penetration depth (i.e., 15 and 30 mm) in sediment. Interestingly, foraminiferal species...
Tipo: Text
Palavras-chave: Mozambique Channel; Foraminifera; Diversity; Microhabitat; Organic matter.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00344/45505/45057.pdf

Response of sedimentary processes to cyanobacteria loading
Provedor de dados: 5
Autores: Zilius, Mindaugas; De Wit, Rutger; Bartoli, Marco.
Sedimentation of pelagic cyanobacteria in dystrophic freshwater and oligohaline lagoons results in large inputs of labile organic matter (OM) to the benthos. We used an experimental approach to study the short-term impact of such phenomena on the benthic microbial community metabolism and on the nitrogen (N) fluxes across the sediment-water interface. We hypothesized an increase of respiratory activity, including N loss via denitrification and its recycling to the water column. Our results show that the incorporation within sediments of the settled bloom increases benthic bacterial activities. This is coupled to large DON and NH4+ effluxes, and to a comparatively smaller increase of N-2 production, while no significant effects were detected for the benthic...
Tipo: Text
Palavras-chave: Cyanobacteria; Organic matter; Sediments; Benthic metabolism; DON; Denitrification.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00354/46504/74457.pdf

Stable isotopes in deep-sea living (stained) foraminifera from the Mozambique Channel (eastern Africa): multispecies signatures and paleoenvironmental application
Provedor de dados: 5
Autores: Fontanier, Christophe; Sakai, Saburo; Toyofuku, Takashi; Garnier, Eline; Brandily, Christophe; Eugene, Thibaut; Deflandre, Bruno.
Oxygen and carbon isotopes (δ18O and δ13C) have been investigated in carbonate tests of deep-sea foraminifera living in the Mozambique Channel (eastern Africa) to understand how environmental constraints (e.g., organic matter, oxygenation) control the intra- and interspecific variability of isotopic signatures. 197 living individuals, including eight different species, from various microhabitats within the sediment were sorted from sediment samples gathered at two stations on the Malagasy upper slope. Results show that the δ18O values of foraminiferal taxa were not controlled by microhabitat pattern. They presented tremendous and intriguing intraspecific variability that is not explained by the classical ontogenetic effect. The δ13C values of infaunal...
Tipo: Text
Palavras-chave: Oxygen and carbon isotopes; Deep-sea foraminifera; Organic matter; Oxygenation; Microhabitat.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00357/46831/46979.pdf

Ecologie bacterienne dans les bacs d'elevage larvaire de coquilles Saint-Jacques (Pecten maximus )
Provedor de dados: 5
Autores: Jacq, E; Moal, Jeanne; Samain, Jean-francois; Corre, S; Daniel, J; Nicolas, Jean-louis; Cochard, Jean-claude; Fera, P.
Larval rearings were performed with seawater either freshly pumped or after storage in a pond. Concerning bacterial populations these waters were characterized by a high diversity, little sized bacteria whose few of them (1%) were cultivable on Zobell medium. In the tanks, the bacterial ecosystem was modified by the presence of antibiotics, larvae and algae: the diversity was lowered, the cellular volume was increased by a factor 2 to 5, 100% bacteria were cultivable and chloramphenicol resistant, and their metabolism changed. Taxonomic screening showed no differences among the two waters neither at the beginning nor at the end of the rearings. However, depending on the water (stored or not) differences were identified for bacterial physiology and...
Tipo: Text
Palavras-chave: Marine aquaculture; Pond culture; Scallop culture; Ecology; Antibiotics; Organic matter; Grazing; Carbohydrates; Mathematical models; Modelling; Growth; Bacterial diseases; Biological production; Culture tanks; Larvae; Rearing.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-914.pdf

Etude de la matière organique et demande en oxygène des sédiments en baie de vilaine
Provedor de dados: 5
Autores: Merceron, Michel.
After the fish mortality through an anoxia, which occured during the summer of 1982 in the bay of Vilaine, the oxygen consumption of the sediment was investigated during spring and summer. It was found moderately important, submitted to limited evolutions along time and on different zones. A significant correlation with the organic carbon content of sediment could not be established.    The oxygen consumption of the bottom waters was approached. In the bay of Vilaine as a whole, it was found more important than the sediment consumption. It could vary in a wide range, till leading to pronounced hypoxias, especially during phytoplankton. (Not controlled OCR)
Tipo: Text
Palavras-chave: Organic matter; Water oxygen consumption; Sediment oxygen consumption; Anoxia; Dissolved oxygen; Coastal waters; Matière organique; Respiration de la phase liquide; Respiration du sédiment; Anoxie; Oxygène dissous; Eaux côtières.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/rapport-2666.pdf

La "malaïgue" de l'été 1990 dans l’étang de Thau
Provedor de dados: 5
Autores: Pichot, Paul; Juge, Claude; Guillou, Jean-louis.
In summer 1990, Thau, a Mediterranean lagoon was affected by a dystrophic crisis. An aerial survey was performed to observe polluted areas. The analysis of the main environmental water conditions have shown that suspended organic matter plays an important part in the development of this dystrophic crisis.
Tipo: Text
Palavras-chave: Crise dystrophique; Oxygène; Matière organique; THAU; Méditerranée; Dystrophic crisis; Oxygen; Organic matter; Mediterranean lagoori.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00432/54333/58906.pdf

High-resolution prediction of organic matter concentration with hyperspectral imaging on a sediment core
Provedor de dados: 5
Autores: Jacq, Kévin; Perrette, Yves; Fanget, Bernard; Sabatier, Pierre; Coquin, Didier; Martinez-lamas, Ruth; Debret, Maxime; Arnaud, Fabien.
In the case of environmental samples, the use of a chemometrics-based prediction model is highly challenging because of the difficulty in experimentally creating a well-ranged reference sample set. In this study, we present a methodology using short wave infrared hyperspectral imaging to create a partial least squares regression model on a cored sediment sample. It was applied to a sediment core of the well-known Lake Bourget (Western Alps, France) to develop and validate a model for downcore high resolution LOI550 measurements used as a proxy of the organic matter. In lake and marine sediment, the organic matter content is widely used, for example, to reconstruct carbon flux variations through time. Organic matter analysis through routine analysis methods...
Tipo: Text
Palavras-chave: Hyperspectral imaging; Chemometrics; Near-infrared spectroscopy; High resolution analysis; Organic matter.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00478/59018/61636.pdf

Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. I. Azote et populations bactériennes en fonction de certains paramètres du milieu
Provedor de dados: 5
Autores: Chamroux, S.; Boucher, G.
Chemical and Biological evolution of sediments in closed circuit : I. Nitrogen and bacteria. A series of well controlled sea water closed circuit sand filters al­lowed the study of chemical and biological regulation processes in the sediment. Bacteria, Nitrogen chemistry and meiofauna were mainly investigated. The evolution of the different forms of nitrogen is rather similar, whatever the organic matter flow in the sediment. As long as the amount of or­ganic input works as limiting factor, bacteria densities are proportional to its flow. No correlation was found between bacteria and chemical parameters in the sand or in the water. The temperature does not seem to play a determinant part neither in the evolution of bacteria nor in the mineralization of...
Tipo: Text
Palavras-chave: Circuit clos; Sédiment; Bactéries; Matière organique; Azote; Closed circuit; Sediment; Bacteria; Organic matter; Nitrogen.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41652/40861.pdf

Evolution des caractéristiques chimiques et biologiques des sédiments en circuit clos. II. Effets de la matière organique circulante sur la méiofaune de systèmes polytrophes
Provedor de dados: 5
Autores: Boucher, G.
Chemical and Biological evolution of sediments in closed circuit : II. Effect of soluble organic matter input on meiofauna in poly­trophic systems. The effect on meiofauna of the input of soluble organic matter in clo­sed circuit sand filters was followed during two years for an oligotrophic, a mesotrophic and an eutrophic tank, and during one year for an atrophic tank. In the case of no input, the density, biomass and species richness of nematodes decreases even if equitability remains constant. Oligotrophy main­tains the stability and diversity. Mesotrophy changes the community composition by species succession. Eutrophy allows biomass increase, due to one dominant species.
Tipo: Text
Palavras-chave: Circuit clos; Matière organique; Meiofaune; Closed circuit; Organic matter; Meiofauna.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00305/41653/40862.pdf

Biorheological properties of intertidal organic fluff on mud flats and its modification of gill ventilation in buried sole Solea solea
Provedor de dados: 5
Autores: Jenkinson, Ian; Claireaux, Guy; Gentien, Patrick.
Intertidal mudflats are important nursery grounds for juveniles of many fish species. However, they are being used increasingly to farm bivalve molluscs, which produce large amounts of organic "fluff", overlying the mud. Fish such as sole, Solea solea, hide in this fluff from potential predators, but the energy consumed by respiring the fluff may be high due to its biorheological properties. We developed an ichthyoviscometer. It incorporates a freshly killed fish as a viscometer, and we developed it to measure the rheological properties of fluids and suspensions, including fluff, at scales encompassing those in gill ventilation. We have shown that the rheological behaviour of fluff is close to that of a gel with a yield stress strongly dependent on...
Tipo: Text
Palavras-chave: Fish; Organic matter; Gill ventilation; Biorheology; Organic fluff; Mud flats.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2219.pdf

Origin and distribution of the organic matter in the distal lobe of the Congo deep-sea fan – A Rock-Eval survey
Provedor de dados: 5
Autores: Baudin, Francois; Stetten, Elsa; Schnyder, Johann; Charlier, Karine; Martinez, Philippe; Dennielou, Bernard; Droz, Laurence.
The Congo River, the second largest river in the world, is a major source of organic matter for the deep Atlantic Ocean because of the connection of its estuary to the deep offshore area by a submarine canyon which feeds a vast deep-sea fan. The lobe zone of this deep-sea fan is the final receptacle of the sedimentary inputs presently channelled by the canyon and covers an area of ~2500 km². The quantity and the source of organic matter preserved in recent turbiditic sediments from the distal lobe of the Congo deep-sea fan were assessed using Rock-Eval pyrolysis analyses. Six sites, located at approximately 5000 m water-depth, were investigated. The mud-rich sediments of the distal lobe contain high amounts of organic matter (~3.5 to 4% Corg), the origin...
Tipo: Text
Palavras-chave: Recent sediments; Congo turbidite system; Organic matter; Rock-Eval pyrolysis.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00369/48018/48095.pdf

Seasonal development of bacterial communities in a coastal marine sediment as related to the input of organic material.
Provedor de dados: 5
Autores: Meyerreil, L; Graf, G.
The seasonal development of benthic communities was followed in a coastal marine sediment of the Kiel Bight (Baltic Sea; FRG). Total benthic biomass, (ATP), bacterial biomass, overall benthic activity (heat production), and enzymatic decomposition rates of carbohydrate (d-amylase activity) followed a seasonal cycle strongly related to certain events in the sediment. Among these, the input of the phytoplankton blooms in autumn and spring, the accumulation of organic material during winter, and changes in the physical characteristics of the sediment turned out to be most important for the development of benthic biomass and activity. Processes within the benthic community occurred in very short time scales (within days).
Tipo: Text
Palavras-chave: Bacteria; Organic matter; Sediments; Bioenergetics; Enzymatic activity; Biomass.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-944.pdf

The impact of easily oxidized material (EOM) on the meiobenthos: Foraminifera abnormalities in shrimp ponds of New Caledonia; implications for environment and paleoenvironment survey
Provedor de dados: 5
Autores: Debenay, J.p.; Della Patrona, Luc; Herbland, Alain; Goguenheim, H.
This study was carried out in shrimp ponds from New Caledonia, in order to determine the cause of the exceptional proportion of abnormal tests (FAI) (often &gt;50%, sometimes &gt;80%). FAI was positively correlated to the quantity of easily oxidized material (EOM) deposited on the bottom of the ponds and to the sediment oxygen demand, and negatively correlated to redox. These results suggest that a very high FAI is a potential indicator for great accumulations of native organic matter, leading to a high sediment oxygen demand. When studying ancient sediments in core samples, exceptional abundances of abnormal tests may indicate periods of high accumulation of EOM, and therefore of oxygen depletion. This finding should help in better management of...
Tipo: Text
Palavras-chave: SW Pacific; Bioindicators; Organic matter; Shrimp ponds; Deformations; Foraminifera.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6955.pdf

Organic matter isotopes reveal enhanced rainfall activity in Northwestern Mediterranean borderland during warm substages of the last 200 kyr
Provedor de dados: 5
Autores: Pasquier, Virgil; Toucanne, Samuel; Sansjofre, Pierre; Dixit, Yama; Revillon, Sidonie; Mokeddem, Zohra; Rabineau, Marina.
In this study we use bulk sediment organic matter stable isotopes (δ13Corg and δ15N) to examine the nature and timing of preserved organic matter in borehole PRGL1-4 from Northwestern Mediterranean Sea. This region is known as a transitional zone between the North Atlantic atmospheric circulation and the North African monsoon system. In the Gulf of Lion (SE France), increased inputs of organic matter from sediment-laden rivers occurred during warm substages of the last 200 kyr (MIS 5e, 5c, and 5a; MIS 6d, and 6b). Increased terrestrial organic matter are inferred from organic carbon isotopic composition (δ13Corg), and are interpreted as resulting from enhanced rainfall over the Rhone river catchment area. Such increase in terrestrial organic carbon induced...
Tipo: Text
Palavras-chave: Mediterranean; Rainfall; North Atlantic oscillation; Organic matter; North Mediterranean borderland; Sapropel.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00473/58421/61116.pdf

Surface functionalization determines behavior of nanoplastic solutions in model aquatic environments
Provedor de dados: 5
Autores: Tallec, Kevin; Blard, Océane; González-fernández, Carmen; Brotons, Guillaume; Berchel, Mathieu; Soudant, Philippe; Huvet, Arnaud; Paul-pont, Ika.
Plastic debris are classified as a function of their size and recently a new class was proposed, the nanoplastics. Nano-sized plastics have a much greater surface area to volume ratio than larger particles, which increases their reactivity in aquatic environment, making them potentially more toxic. Only little information is available about their behavior whereas it crucially influences their toxicity. Here, we used dynamic light scattering (DLS) to explore the influence of environmental factors (fresh- and saltwater, dissolved organic matter) on the behavior (surface charge and aggregation state) of three different nano-polystyrene beads (50 nm), with (i) no surface functionalization (plain), (ii) a carboxylic or (iii) an amine functionalization. Overall,...
Tipo: Text
Palavras-chave: Nanoplastic; Dynamic light scattering; Behavior; Aggregation; Salinity; Organic matter.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00485/59652/62684.pdf

Essai de détermination d'une typologie des sédiments côtiers en fonction de l'apparition d'eaux colorées
Provedor de dados: 5
Autores: Arzul, Genevieve; Youenou, A.; Derrien, Annick; Gentien, Patrick; Crassous, M.p.; Lunven, M.
The study of different chemical parameters characterizing the coastal sediment, showed a possible relation between, respectively, high levels in organic matter and total copper, and the "red tide"  phenomenon.
Tipo: Text
Palavras-chave: Sédiment côtier; Eaux colorées; Matière organique; Cuivre; Coastal sediment; Red time; Organic matter; Copper.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00425/53708/54565.pdf

Mesure de la demande chimique en oxygène dans l'eau de mer.
Provedor de dados: 5
Autores: Michel, Pierre.
Introduction: Measuring the chemical oxygen demand (COD) is a way of determining the organic matter in water based on its oxidisibility by bichromate. The presence of organic matter in sea water is one of the factors that determines the productivity of the oceans: whether this organic matter will be absorbed directly or must first be transformed into nutritive substances by bacteria. This beneficial action also has its limits. On the one hand, consumption of organic matter remains limited; when it exceeds a certain rate, there is no longer any increase in productivity. On the other hand, the excess organic matter deteriorates by consuming the dissolved oxygen and thus competes with marine life. In extreme cases, this excess can cause the eutrophication of...
Tipo: Text
Palavras-chave: Methodology; Organic matter; Oxygen demand; Seawater.
Ano: 1972
URL: http://archimer.ifremer.fr/doc/1972/publication-2060.pdf

Meiofauna and sedimentary organic matter off Central Chile: response to changes caused by the 1997-1998 El Nino
Provedor de dados: 5
Autores: Neira, C; Sellanes, J; Soto, A; Gutierrez, D; Gallardo, Va.
Quantitative surveys of metazoan meiofauna were carried out in an upwelling region off Central Chile (36 degreesS). During May 1997 and May 1998, coinciding with the onset and end of Fl Nino, five benthic stations (respectively 27, 34, 64, 88, and 120 m depth), from the middle of Concepcion Bay to the edge of the adjacent continental shelf, were sampled. The sedimentary organic matter biopolymeric fraction (proteins, carbohydrates and lipids) and chloroplastic pigments were also assessed. Total meiofauna abundance and biomass increased significantly between sampling dates at the mid-bay and inner shelf sites, from 1474 +/- 354 to 5035 +/- 291 individuals 10 cm(-2) and from 2618 +/- 332 to 5241 +/- 903 individuals 10 cm(-2), respectively. The relative...
Tipo: Text
Palavras-chave: Chili central; El Niño; Méiofaune; Matière organique; Thioploca; Central Chile; El Nino; Meiofauna; Organic matter; Thioploca.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43358/42857.pdf

Origine et devenir de la matière organique au sein du micro-estuaire temporaire de Fiume Santu (L’Agriate, Haute-Corse)
Provedor de dados: 5
Autores: Massey, Jean-laurent.
In relation with meteorological, hydrological and topographic characteristics, Corsica has a very large number of temporarily open/closed micro-estuaries. Agriates contains several of them, including the Fiume Santu’s temporarily micro-estuary. These ecosystems are specific because of their sporadic connection with the sea. The opening and closure depends on both the river flow and the presence of the Posidonia oceanica (L.) Delile “banquettes”. Characterization of the global functioning was based on a multiparameter approach (particulate matter and dissolved inorganic matter descriptors, carbon and nitrogen stable isotope, phytoplankton communities), in order to qualify and quantify the organic matter (OM), along an estuary – coastal zone gradient. The OM...
Tipo: Text
Palavras-chave: Corsica; Fiume Santu; Micro-estuaire temporaire; Matière organique; Isotopes stables; Nutriments; Phytoplancton; Corsica; Fiume Santu; Temporarily open/closed micro-estuary; Organic matter; Stable isotope; Nutrients; Phytoplankton.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00276/38691/37188.pdf

Influence of     Crepidula fornicata     on suspended particle dynamics in coastal systems: a mesocosm experimental study
Provedor de dados: 5
Autores: Grasso, Florent; Carlier, Antoine; Cugier, Philippe; Verney, Romaric; Marzloff, Martin.
In coastal environments, strong feedback can exist between benthic fauna and sediment dynamics. Benthic populations can modify sediment dynamics through biofiltration and bioturbation, while hydro- and sediment dynamics directly determine local environmental conditions for benthic organisms. However, these complex feedbacks are difficult to study in situ. Here, we carried out mesocosm experiments to characterize the effects of a benthic species (the gastropod Crepidula fornicata) on mud dynamics under hydrodynamic conditions representative of their natural habitat. Different experimental tests related to the inclusion (or not) of dead or live crepidula reveal that biofiltration can increase particle settling up to 40%. Flocculation, which is strengthened...
Tipo: Text
Palavras-chave: Laboratory experiments; Coastal processes; Physical-biological interactions; Benthic engineer species; Mud settling; Flocculation; Biofiltration; Organic matter.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00662/77403/79043.pdf

Influence of Freshwater Discharges on Biogeochemistry and Benthic Communities of a Coral Reef Ecosystem (La Réunion Island, Indian Ocean)
Provedor de dados: 5
Autores: Tedetti, Marc; Bigot, Lionel; Turquet, Jean; Guigue, Catherine; Ferretto, Nicolas; Goutx, Madeleine; Cuet, Pascale.
We investigated the influence of freshwater discharges on biogeochemistry and benthic communities of La Saline fringing reef, the largest coral reef system of La Réunion Island (France, Indian Ocean). Sampling was conducted in February–March 2012 along a land-ocean continuum, including rivers, groundwater, reef waters, and oceanic waters. Our results indicated the discharges of basalt groundwater (enriched in nitrates) in the southern part of the reef, and the discharges of sand groundwater and river waters (enriched in organic matter) in sites located northward. These discharges mainly impacted fore reef surface waters, while groundwater resurgences were more diffuse and not clearly detected in depth. We highlighted the relationship Si(OH)4/NO3– to...
Tipo: Text
Palavras-chave: Coral reefs; La Reunion; Indian Ocean; Eutrophication; Groundwater; Nutrients; Organic matter; Fluorescence.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00658/77030/78316.pdf

Dynamique des matières en suspension en mer cotière : caractérisation, quantification et interactions sédiments/matière organique
Provedor de dados: 5
Autores: Chapalain, Marion.
The knowledge of suspended particulate matter (SPM) and turbidity dynamics in coastal waters is essential for studying marine ecosystems. Flocculation/deflocculation processes are crucial mechanisms controlling the dynamics of SPM physical characteristics and thus, the fate of these SPM in the environment. This PhD thesis focuses on the SPM characteristics and their dynamics in coastal waters, from tidal to annual scales, in response to hydrodynamic, hydrological and biological forcing that take place at the interface between estuaries and coastal seas. To this end, optical and acoustic sensors were deployed in situ through 6 field campaigns in 2016, in order to characterize and quantify SPM in the water column, near the mouth of the Seine estuary...
Tipo: Text
Palavras-chave: Matière en suspension (MES); Floculation; Matière organique; Distribution en classe de taille; Dimension fractale; Capteurs optiques et acoustiques; Baie de Seine; Suspended particulate matter (SPM); Flocculation; Organic matter; Particle size distribution; Fractal dimension; Optical and acoustic sensors; Seine Bay.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61155/64591.pdf

Dynamique et réponse fonctionnelle des foraminifères et de la macrofaune benthiques en zone ostréicole dans les pertuis charentais
Provedor de dados: 5
Autores: Bouchet, Vincent.
In oyster farming areas, organic matter fluxes toward sediment is increased. Pacific oysters (Crassostrea gigas) reject organic-rich faeces and pseudofaeces as a result of filtration process. Organic matter can be consumed by benthic fauna, but in excess it can entails the reduction of benthic faunal species richness, abundance and biomass. Organic matter degradation also induces hypoxic (or anoxic) conditions in the sediment, and production of ammonia and sulfides in toxic concentrations. The main objective of this study is to assess the effects of oyster farming on benthic intertidal ecosystems in the Pertuis Charentais. Benthic macrofauna, living (stained) foraminifera, and physicochemical characteristics of the water column and sediment were used as...
Tipo: Text
Palavras-chave: CAT scan; Bioturbation; Macrofauna/foraminifera interaction; Sensible species; Tolerant species; Benthic foraminifera; Benthic macrofauna; Chlorophyl a; Organic matter; Intertidal areas; Pertuis charentais; Oyster farming; CAT scan; Bioturbation; Interaction macrofaune/foraminifères; Espèces sensibles; Espèces tolérantes; Foraminifères benthiques; Macrofaune benthique; Chlorophylle a; Matière organique; Zone intertidale; Pertuis charentais; Ostréiculture.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-2582.pdf

La qualité des eaux dans l'Estuaire de la Gironde. 1- Traitement des données. 2 - Synthèse
Provedor de dados: 5
Autores: Maurice, Laurence.
The main problem of the Girond estuary is a pollution by the cadmium. During this last ten years, the good quality of the water is proved by the analysis of the main physico - chemical and biochemical parameters and bacteria. But since 1989, straight to the Blayais power station, the BOD5 varied between 2 and 3,5 mg.l-1 and a diminution of the dissolved oxygen has been observed; it's probably caused by the accumulation of biodegradable organic matter in the maximum turbidity zone during years characterized by low river flows. For average river flow, urban discharges takes part for 20 % in total fluxes of BD05; in 1991, this part attempts 35 %. During the last 7 years, the pluriannual evolution of the nitrate concentrations measured in the Garonne river...
Tipo: Text
Palavras-chave: Oxygène; Sels nutritifs; Matière organique; Bactéries; Apports; Estuaire Gironde; Oxygen; Nutrients; Organic matter; Bacteria; Fluxes; Gironde estuary.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00037/14855/12178.pdf

Comparative study of isotopic trends in two coastal ecosystems of North Biscay: A multitrophic spatial gradient approach
Provedor de dados: 5
Autores: Mortillaro, J. M.; Schaal, G.; Grall, Jacques; Nerot, C.; Brind'Amour, Anik; Marchais, V.; Perdriau, M.; Le Bris, H.
In coastal estuarine embayments, retention of water masses due to coastal topography may result in an increased contribution of continental organic matter in food webs. However, in megatidal embayments, the effect of topography can be counterbalanced by the process of tidal mixing. Large amounts of continental organic matter are exported each year by rivers to the oceans. The fate of terrestrial organic matter in food webs of coastal areas and on neighboring coastal benthic communities was therefore evaluated, at multi-trophic levels, from primary producers to primary consumers and predators. Two coastal areas of the French Atlantic coast, differing in the contributions from their watershed, tidal range and aperture degree, were compared using carbon and...
Tipo: Text
Palavras-chave: Bay of Brest; Bay of Vilaine; Benthic; Filter-feeders; Stable isotopes; Organic matter.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00167/27847/26203.pdf

Rare earth elements and neodymium isotopes in sedimentary organic matter
Provedor de dados: 5
Autores: Freslon, Nicolas; Bayon, Germain; Toucanne, Samuel; Bermell, Sylvain; Bollinger, Claire; Chéron, Sandrine; Etoubleau, Joel; Germain, Yoan; Khripounoff, Alexis; Ponzevera, Emmanuel; Rouget, Marie Laure.
We report rare earth element (REE) and neodymium (Nd) isotope data for the organic fraction of sediments collected from various depositional environments, i.e. rivers (n=25), estuaries (n=18), open-ocean settings (n=15), and cold seeps (n=12). Sedimentary Organic Matter (SOM) was extracted using a mixed hydrogen peroxide/nitric acid solution (20%-H2O2 – 0.02M-HNO3), after removal of carbonate and oxy-hydroxide phases with dilute hydrochloric acid (0.25M-HCl). A series of experimental tests indicate that extraction of sedimentary organic compounds using H202 may be complicated occasionally by partial dissolution of sulphide minerals and residual carbonates. However, this contamination is expected to be minor for REE because measured concentrations in H2O2...
Tipo: Text
Palavras-chave: Organic matter; Rare earth elements; REE; Neodymium isotopes; ΕNd; Sediment; Boundary Exchange; Paleoceanography.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00191/30250/28682.pdf

Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus
Provedor de dados: 5
Autores: Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text
Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf

Minéralisation de la matière organique et échanges ioniques à l'interface eau-sédiment de l'étang de Berre, Méditerranée
Provedor de dados: 5
Autores: Delmas, Daniel.
The étang de Berre, near Marseilles (France), is an inland brackish basin with a high primary rate of production. In 1966, the diversion of the Durance River introduced important hydrological changes. A study of organic matter mineralization and ionie exchanges at the water-sediment interface has made it possible to distinguish two areas, according to the composition of organic matter, mineralization mechanism and ionie transfers. In the North, the high rate of mineral sedimentation leads to a low content of organic matter in the sediment. This organic matter of detrital origin is little affected by mineralization; there is, however, high production of ammonium nitrogen, which is released to overlying waters. Nitrates and nitrites undergo denitrification...
Tipo: Text
Palavras-chave: Interface eau-sédiment; Matière organique; Eau interstitielle; Minèralisation; Milieu saumâtre; Water-sediment interface; Organic matter; Lnterstitial water; Mineralization; Brackish basin.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00122/23317/21142.pdf

Origine, devenir et contrôle de la matière particulaire dans les élevages de poissons marins en système recyclé
Provedor de dados: 5
Autores: Franco, Miguel.
The particulate matter plays an essential role in the functioning of recirculating aquaculture systems (RAS). Rich in organic substances, it provides ideal conditions for the bacterial development, which contribute to its mineralization. The understanding of interactions between the bio-geochemical cycles of carbon and nitrogen in these processes is necessary to define an effective and adapted management of aquaculture facilities.  A methodology using natural stable isotopes (13C and 15N) and elemental carbon and nitrogen analysis on particulate matter, allows to identify its sources and to quantify its fluxes. Applying this methodology, we found an enrichment of 13C in dorsal muscle of reared fish and non differences of 13C in fish liver compared to the...
Tipo: Text
Palavras-chave: Nitrogen; Carbon; Isotopes; Organic matter; Particulate matter; Dicentrarchus labrax; Seabass; Recirculating systems; Aquaculture; Azote; Carbone; Isotopes; Matière organique; Matière particulaire; Dicentrarchus labrax; Bar; Système de recirculation; Aquaculture.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/these-322.pdf

Shift in benthic assemblages and organisms’ diet at salmon farms: community structure and stable isotope analyses
Provedor de dados: 5
Autores: Callier, Myriam; Lefebvre, Sebastien; Dunagan, Mary K.; Bataille, Marie-paule; Coughlan, Jennifer; Crowe, Tasman P.
The extent of the influence of salmon farming on the environment and on the uptake of particulate and dissolved effluents by benthic organisms was assessed using community structure and stable isotope analyses. Sediment cores were collected in 2 directions: perpendicular and parallel to the main residual current, 0, 25 and 200 m from 2 salmon farms (Millstone and Cranford) located in Mulroy Bay, Ireland. In addition, artificial substrates were placed for 2 mo at 1 m depth 0, 25 and 200 m from one farm to trace the uptake of farm-related nutrients by fouling organisms. The extent of measurable change in benthic communities (abundance, diversity, structure, trophic composition) depended on residual current direction. Intraspecific variation in isotopic...
Tipo: Text
Palavras-chave: Aquaculture; Organic matter; Stable isotope; Community structure; Diet shift; Trophic structure.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00144/25481/23634.pdf

Organic carbon accumulation in modern sediments of the Angola basin influenced by the Congo deep sea fan
Provedor de dados: 5
Autores: Baudin, Francois; Martinez, Philippe; Dennielou, Bernard; Charlier, Karine; Marsset, Tania; Droz, Laurence; Rabouille, Christophe.
Geochemical data (total organic carbon-TOC content, δ13Corg, C:N, Rock-Eval analyses) were obtained on 150 core tops from the Angola basin, with a special focus on the Congo deep sea fan. Combined with the previously published data, the resulting dataset (322 stations) shows a good spatial and bathymetric representativeness. TOC content and δ13Corg maps of the Angola basin were generated using this enhanced dataset. The main difference in our map with previously published ones is the high terrestrial organic matter content observed downslope along the active turbidite channel of the Congo deep sea fan till the distal lobe complex near 5,000 m of water-depth. Interpretation of downslope trends in TOC content and organic matter composition indicates that...
Tipo: Text
Palavras-chave: Organic matter; Recent sediments; South Atlantic Ocean; Turbidites.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00369/47974/47999.pdf

Size-dependent variations on the nutritional pathway of Bathymodiolus azoricus demonstrated by a C-flux model
Provedor de dados: 5
Autores: Martins, Irene; Colaco, Ana; Dando, Paul R; Martins, I; Desbruyeres, Daniel; Sarradin, Pierre-marie; Marques, J; Serrao Santos, R.
Bathymodiolus azoricus is a mussel from vent fields in the south-west of the Azores Triple junction (Mid-Atlantic Ridge-MAR). Experimental evidence indicates that B. azoricus is a mixotrophic organism, which obtains energy from a dual endosymbiosis and filter-feeding. Yet the relative contribution of symbiosis and filter-feeding to B. azoricus nutrition is still unclear. To address this question, we developed and individual-based model which describes sulphide and methane uptake by endosymbionts, the energy gained through microbial oxidations, the transfer of energy from endosymbionts to B. azoricus, filter-feeding of particulate organic matter (POC) by B. azoricus and the energetic wastes of the mytilid with respiration. The model accounts for...
Tipo: Text
Palavras-chave: Carbon flux model; Organic matter; Size; Filter feeding; Endosymbiosis; Bathymodiolus azoricus.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/2008/publication-4541.pdf

Mangrove‐Derived Organic and Inorganic Carbon Exchanges Between the Sinnamary Estuarine System (French Guiana, South America) and Atlantic Ocean
Provedor de dados: 5
Autores: Ray, Raghab; Thouzeau, Gerard; Walcker, Romain; Vantrepotte, Vincent; Gleixner, Gerd; Morvan, Sylvain; Devesa, Jeremy; Michaud, Emma.
There is growing evidence that a substantial fraction of the dissolved organic and inorganic carbon (DOC and DIC) and particulate organic carbon (POC) can be exported from mangroves to the ocean. Yet our understanding of C fluxes in mangrove forests is limited to only few regional studies that exclude the world's longest sediment dispersal system connected to the Amazon River. The present study aims at (1) examining tidal fluctuations of DOC, POC, and DIC; their isotopes; and optical properties such as chromophoric dissolved organic matter (CDOM) and (2) estimating their exchange fluxes between the mangroves and adjacent coastal water in the Sinnamary estuary, French Guiana. Time series observation highlighted that physical processes coupled to tides...
Tipo: Text
Palavras-chave: Organic matter; Tidal cycle; Carbon flux; Mangroves; French Guiana.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00643/75488/76339.pdf

Relations entre les eaux interstitielles des fonds sedimentaires ostreicoles et le milieu hydrobiologique. Le Bassin des Chasses des Sables d'Olonne
Provedor de dados: 5
Autores: Feuillet, Michèle.
Extensive data have been obtained on oyster-bearing sediments and interstitial and overlying waters in the Bassin des Chasses, les Sables d'Olonne, which will enable a scale of suitability of waters for oyster-culture to be compiled. The studies concerned: I. Hydrology, including fresh water inflow: II. Salinity; alkaline reserve; Na, K, Ca and Mg levels: III. Circulation and distribution of nitrogenous substances: IV. The N sub(2) cycle: V.P. Nitrogenous and phosphorus nutrients are regenerated continuously in the sediments and replenish the free water.
Tipo: Text
Palavras-chave: Bisacy bay; Organic matter; Nitrogen concentration; Phosphorus; Marine sediment; Hydrobiology; Oyster culture zone.
Ano: 1971
URL: http://archimer.ifremer.fr/doc/1971/publication-2239.pdf

Evalution du bilan énergétique de l'huître creuse, Crassostrea gigas, en baie de Marennes-Oléron (France)
Provedor de dados: 5
Autores: Soletchnik, Patrick; Goulletquer, Philippe; Heral, Maurice; Razet, Daniel; Geairon, Philippe.
This ecophysiological study was conducted on the Japanese oyster (Crassostrea gigas) reared in Marennes-Oléron bay (France), in May 1992. Measurements were achieved using natural food conditions on three different days (a, b, c) at different tide levels (coefficient of 49, 57, and 88). Total particulate matter was continuously monitored with a micro-computer and a turbidimeter probe. The "consumption" function was calculated using a new formula allowing for particulate leakage prior to the pre-ingestive particle sorting. This particle leakage represents a passive loss of particles flowing through the branchial filter. Comparisons of the consumption and absorption rates of organic matter and chlorophyll a showed significant differences between seston...
Tipo: Text
Palavras-chave: Crassostrea gigas; Consumption rate; Selection efficiency; Absorption rate; Energetic budget; Organic matter; Chlorophyll alpha; Marennes-Oleron bay.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/publication-3086.pdf

Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland)
Provedor de dados: 5
Autores: Bridier, Guillaume; Meziane, Tarik; Grall, Jacques; Chauvaud, Laurent; Sejr, Mikael Kristian; Menneteau, Sylvain; Olivier, Frederic.
Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the...
Tipo: Text
Palavras-chave: Arctic ecosystems; Benthic-pelagic coupling; Organic matter; Climate change; Fatty acids; Stable isotopes; Young Sound.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00492/60318/67180.pdf

The shell organic content in the energy budget of Mytilus trossulus from the South Baltic
Provedor de dados: 5
Autores: Wolowicz, Macciek; Goulletquer, Philippe.
La quantité de matière organique et sa valeur énergétique ont été évaluées pour les coquilles de Cerastoderma glaucum, Macoma balthica et Mytilus trossulus de la baie de Gdansk, par extraction chimique et microcalorimétrie. Le contenu moyen en matière organique varie de 0,54% chez C.glaucum, à 5,21 % chez M. balthica et 5,92% chez M. trossulus. La valeur énergétique de la matière organique de la coquille varie entre 15,15 (± 1.41) j .mg-1 chez M. balthica, 20,17 (± 1,60) j.mg-1 chez M. trossulus et 23,88 (± l ,56) j.mg-1 chez C. glaucum. Le contenu en matière organique de la coquille et sa valeur énergétique sont spécifiques, et corrélés avec la microdistribution géographique (facteurs de l'environnement) de la population, ou avec le type de sédiment. Des...
Tipo: Text
Palavras-chave: Matière organique; Valeur énergétique; Coquille; Mytilus trossulus; Organic matter; Energy values; Shell; Mytilus trossulus.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00065/17594/15118.pdf

Detoxification of Pacific oyster Crassostrea gigas fed on diets of Skeletonema costatum with and without silt, following PSP contamination by Alexandrium minutum
Provedor de dados: 5
Autores: Gueguen, Marielle; Bardouil, Michele; Baron, Regis; Lassus, Patrick; Truquet, Philippe; Massardier, Julie; Amzil, Zouher.
Contamination of shellfish by paralytic shellfish poisoning ( PSP) toxins poses an economic threat to shellfish farmers. As contaminated shellfish cannot be harvested for long periods of time, it would be very useful to develop processes to optimise and shorten their detoxification. In this study, Pacific oysters Crassostrea gigas were first experimentally contaminated over a period of 13 days with a continuous flow of toxic Alexandrium minutum cultures at concentrations ranging from 150 to 200 cell ml(-1) ( toxin content after 13 days of contamination 438 mu g STX equiv. 100 g(-1) wet weight). Then, two different detoxification treatments were tested and showed detoxification rates greater than those observed in coastal environments. The first treatment...
Tipo: Text
Palavras-chave: Alexandrium minutum; Crassostrea gigas; Detoxification; Inorganic matter; Organic matter; PSP; Paralytic shellfish poisoning.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3896.pdf

Effects of short-term environmental disturbances on living benthic foraminifera during the Pacific oyster summer mortality in the Marennes-Oléron Bay (France)
Provedor de dados: 5
Autores: Bouchet, Vincent; Debenay, Vincent; Sauriau, Pierre-guy; Radford Knoery, Joel; Soletchnik, Patrick.
Sediment cores were collected from April to August 2004 on tidal mudflats of the macrotidal Marennes-Oléron Bay (SW France), famous for the cultivation of Pacific oysters (Crassostrea gigas). The response of living (stained) benthic foraminifera to short-term biogeochemical disturbances in the sediment and overlying water, which may be involved in oyster summer mortality, was monitored. Short-term hypoxia occurred in early June, in conjunction with a sudden rise in temperature. In mid-June, the ammonia content of sediment porewater increased, leading to potentially maximal flux towards overlying waters. Foraminiferal assemblages, particularly in the topmost layer, were altered. Ammonia tepida was the most tolerant to temperature increase and hypoxic...
Tipo: Text
Palavras-chave: Marennes Oléron bay; Aquaculture; Crassostrea gigas; Intertidal; Ammonium; Hypoxia; Organic matter; Living benthic foraminifera.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2586.pdf

EFFECTIVENESS OF THE APPLICATION OF ARBUSCULAR MYCORRHIZA FUNGI AND ORGANIC AMENDMENTS TO IMPROVE SOIL QUALITY AND PLANT PERFORMANCE UNDER STRESS CONDITIONS
Provedor de dados: 126
Autores: Medina,Almudena; Azcón,Rosario.
Plant growth is limited in arid and/or contaminated sites due to the adverse conditions coming from heavy metal (HM) contamination and/or water stress. Moreover, soils from these areas are generally characterised by poor soil structure, low water-holding capacity, lack of organic matter and nutrient deficiency. In order to carry out a successful re-afforestation, it is necessary to improve soil quality and the ability of plants species to resist this harsh environment. The symbiosis with arbuscular mycorrhizal (AM) fungi has been proposed as one of the mechanisms of plant heavy metal tolerance and water stress avoidance. On the other hand, addition of organic amendments to the soil can reverse degradation of soil properties. Agro-waste residues such as dry...
Tipo: Journal article
Palavras-chave: Arbuscular mycorrhiza (AM); Fungi; Organic amendment; Heavy metal (HM) contamination; Water stress; Drought; Organic matter; Rock phosphate; Revegetation; Bioremediation; Aspergillus niger; Phosphate solubilization.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162010000100009

Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains
Provedor de dados: 83
Autores: Benedito,Evanilde; Santana,Ana Rute A.; Werth,Martin.
ABSTRACT The stable carbon isotopic variability and the contributions of autochthonous (sediment microbial biomass, phytoplankton, and periphyton) and allochthonous (soil microbial biomass) sources available to the detritivorous fish Prochilodus lineatus were investigated in three environments of the floodplain of the Upper Paraná River. The isotopic composition of carbon sources and fish varied significantly among the studied environments. The autochthonous resources, represented by the phytoplankton, were the most assimilated by the species, followed by periphyton and sediment microbial biomass. The species used the sources differently in each environment. This study suggests that the inherent characteristics of this area, as well as the size of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic ecosystems; Carbon sources; Fish; Organic matter; Stable isotopes.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400204

Estudio de la materia orgánica en los sedimentos del Río Jubones, en el área comprendida entre el puente la Iberia hasta su desembocadura
Provedor de dados: 20
Autores: Jácome de Solórzano, M.; Llanos de Bonilla, L.
El principal objetivo de este trabajo es determinar cuantitativamente el contenido de la materia orgánica en base a la concentración de carbono orgánico, nitrógeno orgánico y fósforo total, tratando de sugerir el posible origen del material orgánico sedimentario en el Río Jubones.
Tipo: Journal Contribution
Palavras-chave: Organic matter; Sediments; Organic matter; Http://aims.fao.org/aos/agrovoc/c_5387.
Ano: 1990
URL: http://hdl.handle.net/1834/2170

Análisis de residuos de organoclorados en los sedimentos de zonas de manglar en la Ciénaga Grande de Santa Marta y la Bahía de Chengue, Caribe colombiano
Provedor de dados: 20
Autores: Espinosa, Luisa F.; Ramírez, Gustavo; Campos, Néstor H.
En los sedimentos superficiales aledaños al manglar, de cuatro estaciones dentro de la Ciénaga Grande de Santa Marta y una estación en la Bahía de Chengue, se analizaron las concentraciones de seis residuos de plaguicidas organoclorados (lindano, heptacloro, aldrin, pp'DDE, pp'DDD y pp'DDT), mediante la técnica de cromatografía gas-líquido. Se realizaron muestreos trimestrales entre marzo y diciembre de 1993, tratando de abarcar las principales épocas climáticas de la región (seca, lluviosa menor, seca menor y lluviosa mayor). Mediante análisis de varianza multifactorial se encontraron diferencias significativas solamente en las concentraciones de lindano, heptacloro y pp'DDE, entre las diferentes épocas climática; los otros tres compuestos (aldrin, pp'DDD...
Tipo: Journal Contribution
Palavras-chave: Ecology; Chemical analysis; Salinity effects; Gas chromatography; Organic matter; Coastal lagoons; Estuaries; Mangroves; Ecology; Organic matter; Estuaries; Gas chromatography; Coastal lagoons; Mangroves; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_5387; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_11097; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 1999
URL: http://hdl.handle.net/1834/3804

Características oceanográficas y geoquímicas del Golfo de Guayaquil durante noviembre de 1994
Provedor de dados: 20
Autores: Cuadra, T. de la; Chalén, X.; Pérez, P.; Macías, P.; Ortega, D.; Ormaza, F.
Las masas de agua encontradas a partir de las variables de estado, indican una contribución muy pobre de Agua Subtropical Superficial (ASTS), mientras que las mayores contribuciones fueron de Agua Tropical Superficial (ATS). Parámetros como la temperatura y la salinidad determinaron un calentamiento del océano, tanto a nivel superficial como subsuperficial, lo cual sería una consecuencia de los procesos de redistribución de calor del océano.Esta dinámica ocasionaría anomalías del orden de los 30 metros para el caso de la profundidad de la termoclima y 2°C para el caso de la TSM. En el plancton se registraron valores mayores a 5000 larvas de peces/10 m2. La menor cantidad (260 larvas/10 m2) se registró hacia el norte del Golfo, observándose al mismo tiempo...
Tipo: Journal Contribution
Palavras-chave: Oceanographic data; Geochemistry; Salinity data; Plankton; Organic matter; Plankton; Organic matter; Geochemistry; Http://aims.fao.org/aos/agrovoc/c_5950; Http://aims.fao.org/aos/agrovoc/c_5387; Http://aims.fao.org/aos/agrovoc/c_24848.
Ano: 1994
URL: http://hdl.handle.net/1834/3080

Spatial and temporal characterization of soft bottom polychaetes in a shallow tropical bay (colombian Caribbean)
Provedor de dados: 20
Autores: Guzmán-Alvis, A.I.; Lattig, P.; Ruíz, J.A.
The spatial and temporal variations of the polychaete assemblages were studied within and off a shallow (10-25 m) tropical bay (Bahía de Portete). The polychaete abundances at family level and their trophic mechanisms were used for this purpose. Sediment samples were collected at six stations in this bay during the wet and dry seasons. Multivariate analysis indicated that off- Bay polychaete assemblages were different from the bay ones; this spatial variation was related to sedimentary characteristics, depth and turbid-water conditions. On the other hand, these assemblages did not show significant differences between the dry and wet seasons. The differences between these two assemblages were given specially by the Syllidae, Gonidadidae, Nephtyidae,...
Tipo: Journal Contribution
Palavras-chave: Trophic relationships; Benthic environment; Organic matter; Temporal variations; Spatial variations; Organic matter; Benthic environment; Http://aims.fao.org/aos/agrovoc/c_5387; Http://aims.fao.org/aos/agrovoc/c_877.
Ano: 2006
URL: http://hdl.handle.net/1834/1979

Determinación de la presencia de hidrocarburos disueltos y dispersos y de materia orgánica en la Ensenada Guayaquil y Punta Orión, Isla Greenwich (Enero-febrero del 2001)
Provedor de dados: 20
Autores: Chaux, H.
El objeto de evaluar la presencia de derivados de petróleo que pudiesen ser vertidos por embarcaciones pequeñas así como el aporte de materia orgánica por la descarga de las aguas doméstica de la Estación Pedro Vicente Maldonado, se planificó el presente estudio. Se efectuaron monitoreos cada seis días por un período de un mes tanto en el Paso Orión como en la Ensenada Guayaquil. Se evacuó un promedio de 2.5 metros cúbicos diarios de aguas servidas a la Ensenada previo tratamiento con cloro y formaldehído.
Tipo: Journal Contribution
Palavras-chave: Petroleum hydrocarbons; Organic matter; Domestic wastes; Organic matter; Domestic wastes; Http://aims.fao.org/aos/agrovoc/c_5387; Http://aims.fao.org/aos/agrovoc/c_35241.
Ano: 2002
URL: http://hdl.handle.net/1834/3821

Distribución y enriquecimiento de metales traza en núcleos de sedimento de tres sistemas costeros del Estado de Sonora, México
Provedor de dados: 20
Autores: Ortega Romero, P.; Vásquez del Castillo, D.
Este trabajo tiene como objetivo principal, conocer el enriquecimiento y distribución de los metales traza y su relación con la materia organic y el tamaño medio de partícula (Mz) en la columna sedimentaria con el fin de determinar su acción e influencia ecológica en el medio ambiente marino.
Tipo: Journal Contribution
Palavras-chave: Distribution; Trace metals; Sediments; Inorganic matter; Organic matter; Distribution; Organic matter; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_5387.
Ano: 1992
URL: http://hdl.handle.net/1834/2299

Investigation on possible chemical pollution of the BouGhraa lagoon south of Tunisia by chemical wastes
Provedor de dados: 20
Autores: Farhat, F.; Ben Aoun, Z.; Chouba, L.; Hadj Ali, M. S.
La mer de BouGhrara, un milieu quasi-lagunaire de cinquante milles hectares environ, a contribué d’une manière remarquable à la production halieutique Tunisienne jusqu’au 1992  4.786 tonnes, année à partir de laquelle cette production n’a cessé de décroître (1.118 tonnes en 2002). Par ailleurs le premier projet industriel d’aquaculture marine y a également vu le jour, atteignant une production aquacole en cages flottantes de 252 tonnes en 1990. Malheureusement cette activité a cessé en 1995, après une dizaine d’années et la société  qui assurait cette production a cessé ses activités et les quelques cages ont été déplacées de la lagune vers le bassin du port de Zarzis à la recherche de conditions environnementales meilleures. Plusieurs raisons ont été...
Tipo: Journal Contribution
Palavras-chave: Chemical pollution; Depletion; Eutrophication; Lagoon fisheries; Organic matter; Pollution effects; Salinity; Temperature; Waste disposal; Acidity.
Ano: 2007
URL: http://hdl.handle.net/1834/4249

Características fisico-químicas de los sedimentos del Golfo San Jorge y su relación con los organismos bentónicos
Provedor de dados: 20
Autores: Fernández, M.
This is a study on surficial sediments and bottom water physico-chemical characteristics of the San Jorge Gulf (SW Atlantic, Argentina)during spring 1999 - winter 2000 (first studied period), autumn 2001- summer 2002 (second studied period)and winter 2003 (third studied period), based on samples obtained during research cruises carried out on board of the INIDEP (Instituto Nacional de Investigación y Desarrollo Pesquero)research vessels. Environmental variables such as temperature, salinity, density, oxygen and bottom water chlorophyll a content as well as granulometric fractions, total organic matter, total organic carbon, total nitrogen, total phosphorous, chlorophyll a and phaeopigments in sediment concentration and depth were analyzed. The origen and...
Tipo: Theses and Dissertations
Palavras-chave: Physicochemical properties; Benthic environment; Organic matter; Shrimp fisheries; Benthos; Organic matter; Benthos; Physicochemical properties; Benthic environment.
Ano: 2006
URL: http://hdl.handle.net/1834/3134

Preliminary Observations on Livestock Productivity in Sheep Fed Exclusively on Haulms from Eleven Cultivars of Groundnut
Provedor de dados: 30
Autores: Blümmel, M.
Palavras-chave: Body weight; Groundnuts; Organic matter; Viruses; Aromatic compounds; Nitrogen; Germplasm; Metabolism; Quality; Biological phenomena.
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3255

Morphological, chemical and in vitro stover quality traits to predict the livestock productivity potential of pearl millet stover
Provedor de dados: 30
Autores: Alexander, G.
Palavras-chave: Millets; Nitrogen; Leaf area; Cell walls; Statistical methods; Organic matter; Forecasting; Nutritive value; Quality; Statistics.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3310

Stover fodder quality traits for dual-purpose sorghum genetic improvement
Provedor de dados: 30
Autores: Blümmel, M.
Palavras-chave: Nitrogen; Sorghum; Organic matter; Body weight; Bioreactors; Genetic improvement; Sampling; Aromatic compounds; Forecasting; Metabolism.
Ano: 2006
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3197

Forage yield and quality in pigeonpea germplasm lines
Provedor de dados: 30
Autores: Alexander, G.
Palavras-chave: Pigeonpeas; Organic acids; Animal nutrition; Heritability; Nitrogen; Germplasm; Wet season; Dry matter; Organic matter; Biological phenomena.
Ano: 2007
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3284

Food-fodder traits in groundnut
Provedor de dados: 30
Autores: Blümmel, M.
Palavras-chave: Genotypes; Nutritive value; Groundnuts; Forecasting; Nitrogen; Yields; Organic matter; Sampling; Quality; Breeds (animals).
Ano: 2005
URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3246

On the need for independently estimating organic tripton carbon content
Provedor de dados: 27
Autores: Pissierssens, P.; Bergmans, M.; Polk, Ph.
A method is described by which the contribution of Non-Living Particulate Organic Matter (NLPOM) to Total Organic Matter can be determined. The dye Trypan Blue stains only dead organic matter. The surface of the stained particles is used as an indirect measure of the NLPOM-carbon content. Applying this method, it is shown that the bivariate linear regression of POM on chlorophyll &lt;i&gt;a&lt;/i&gt; may produce serious errors in the calculated NLPOM contribution when carbon which is neither tripton- nor chlorophyll-related is present in appreciable quantities.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Analytical techniques; Carbon compounds; Organic matter; Staining.
Ano: 1985
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3283

Short-term variations in flux and spatial variability of soil CO2 in native forest
Provedor de dados: 190
Autores: D’Andrea, Alexandre Fonseca; Silva, Marx Leandro Naves; Freitas, Diego Antonio França de; Curi, Nilton; Silva, Carlos Alberto.
Soil is an important compartment of carbon in terrestrial ecosystem, retaining substantial quantity of this element in organic forms, mainly in forest areas. The understanding of the factors that affect the fluxes of soil CO2 is the basic to the reduction of emissions of greenhouse gases to the atmosphere. The objective of this work was to evaluate the patterns of spatial variability of soil CO2 flux in native forest in a very clayey dystroferric Red Latosol (Oxisol), in Lavras city, Minas Gerais state, Brazil. A grid of 32 points was delimited, regularly spaced in 5 m distance, in which the CO2 flux and environmental factors (water evaporation, temperature and soil moisture) and attributes related to fertility (pH, base soil saturation and exchangeable...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental factors; Carbon; Organic matter; Linear correlation. fatores ambientais; Carbono; Matéria orgânica; Correlação linear.
Ano: 2010
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/169

Cover plants with potential use for crop-livestock integrated systems in the Cerrado region
Provedor de dados: 86
Autores: Carvalho,Arminda Moreira de; Souza,Lara Line Pereira de; Guimarães Júnior,Roberto; Alves,Pedro Cesar Almeida Castro; Vivaldi,Lúcio José.
The objective of this work was to evaluate the effects of lignin, hemicellulose, and cellulose concentrations in the decomposition process of cover plant residues with potential use in no-tillage with corn, for crop-livestock integrated system, in the Cerrado region. The experiment was carried out at Embrapa Cerrados, in Planaltina, DF, Brazil in a split plot experimental design. The plots were represented by the plant species and the subplots by harvesting times, with three replicates. The cover plants Urochloa ruziziensis, Canavalia brasiliensis, Cajanus cajan, Pennisetum glaucum, Mucuna aterrima, Raphanus sativus, Sorghum bicolor were evaluated together with spontaneous plants in the fallow. Cover plants with lower lignin concentrations and,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Organic matter; Corn yield.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001000012

Soil chemical attributes restricting grain yield in Oxisols under no-tillage system
Provedor de dados: 86
Autores: Corassa,Geomar Mateus; Santi,Antônio Luís; Silva,Vanderlei Rodrigues da; Baron,Felipe Arthur; Reimche,Geovane Boschmann; Fioresi,Dejales; Flora,Diandra Pinto Della.
Abstract: The objective of this work was to identify soil chemical attributes restricting grain yield in Oxisols under the no-tillage system, using directed soil sampling. High, medium, and low yield zones were defined in two agricultural fields using historical yield data of several crops. The yield zones were defined based on the harvest maps of the following crops: corn in 2008/2009, white oat in 2009, and corn in 2012/2013 in field I, with 117.70 ha; and corn in 2009/2010, soybean in 2010/2011, and wheat in 2012 in field II, with 107.30 ha. Soil sampling points were georeferenced in each yield zone, where samples were collected at eight soil depths, spaced 0.05 m apart, totaling 80 variables. Low yields were associated with low cation exchange...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Precision agriculture; Site-specific management; Soil fertility; Soil sampling; Yield zones.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001101203

PERSISTENCE OF ATRAZINE, METRIBUZIN AND SIMAZINE HERBICIDES IN TWO SOILS
Provedor de dados: 86
Autores: FUSCALDO,FEDERICO; BEDMAR,FRANCISCO; MONTERUBBIANESI,GLORIA.
An oat bioassay was conducted in pots under greenhouse conditions to determine the persistence of atrazine, metribuzin and simazine herbicides in soils of the southeast of Buenos Aires Province, Argentina. Atrazine rates of 0, 0.58, 1.16 and 2.32 mug g-1 of active ingredient (a.i.), metribuzin rates of 0, 0.14, 0.28 and 0.56 mug g-1 of a.i., and simazine rates of 0, 0.72, 1.45 and 2.9 mug g-1 of a.i. dry soil weight were applied to pots containing soils from Balcarce and San Cayetano sites. Organic matter (OM) content and pH of Balcarce soil were 5.5% and 5.8%, while for San Cayetano soil were 2.9% and 6.7%, respectively. Relative dry weight (RDW) of oat shoots was calculated as percentage of control. Considering a 20% RDW reduction of oat shoots,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oat; Organic matter; PH; Herbicide rates; Bioassay.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999001100009

Soil quality indicators after conversion of “murundu” fields into no-tillage cropping in the Brazilian Cerrado
Provedor de dados: 86
Autores: Souza,Edicarlos Damacena de; Silva,Camila Rodrigues Menezes da; Pinto,Flávio Araújo; Carneiro,Marco Aurélio Carbone; Paulino,Helder Barbosa; Pacheco,Leandro Pereira; Terra,Flávia Dias; Laroca,Jackeline Vieira dos Santos.
Abstract: The objective of this work was to evaluate changes in soil quality due to different times of adoption of the no-tillage system in “murundu” (mound) fields converted to agriculture, as well as to identify the best indicators to explain these changes. The study was carried out on a Plinthic Altisol, in the municipality of Portelândia, in the state of Goiás, Brazil. The treatments consisted of different times of conversion and of adoption of the no-tillage system - 8, 12, and 17 years - and of native area between the mounds and on top of the mounds (reference area). After 17 years of the adoption of no-tillage, there was an increase in organic carbon and nitrogen, as well as in their particulate fractions in relation to the reference area. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydromorphic soils; Microbial biomass; Organic matter; Plinthosols.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000103801

Sorption of oxadiazon in soils cultivated in the brazilian cerrado
Provedor de dados: 87
Autores: Mendes,K.F.; Reis,M.R.; Pereira,A.A.; Nunes,A.R.S.; Santos,C.E.M.; Assis,A.C.L.P.
The objective of this study was to evaluate oxadiazon sorption in different soils of the Brazilian Cerrado, highlighting the correlations of lethal doses of this herbicide capable of inhibiting 50% of the dry matter accumulation of the bio-indicator (LD50) among the chemical characteristics of the soil and its direct and indirect effects. The experiment was carried out in a greenhouse in a randomized block design and four repetitions. Each experimental unit consisted of a pot with increasing rates of oxadiazon and oat (Avena sativa), as the bio-indicator species. For sorption evaluation, washed sand and 22 soils (substrates) from Cerrado Brazilian's Alliaceae cultivated areas were used. LD50 and sorption ratio (SR) = [(LD50soil - LD50sand)/LD50sand] to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bioassay; Neutral herbicide; Organic matter.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100024

Persistence of Biological Activity and Leaching Potential of Herbicides Aminocyclopyrachlor and Indaziflam in Soils with Different Textures1
Provedor de dados: 87
Autores: GUERRA,N.; OLIVEIRA JÚNIOR,R.S.; CONSTANTIN,J.; OLIVEIRA NETO,A.M.; GEMELLI,A.; PEREIRA JÚNIOR,D.M.; GUERRA,A.
ABSTRACT Herbicides aminocyclopyrachlor and indaziflam are under development in Brazil. Information about the behaviors in Brazilian soils and climate is scarce. Thus, the present work has aimed to evaluate the persistence of biological activity and leaching potential of aminocyclopyrachlor and indaziflam in contrasting textured soils by means of bioassays. For the evaluation of persistence, four experiments were performed, in which soils with different textures were studied in different time periods between herbicide application and bioindicator sowing (beet and soybeans). To determine leaching potential, three blades of rainfall (0, 30 and 60 mm) were simulated, each constituting a single experiment in soils with different textures and five bands of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Residual activity; Bioassay; Organic matter.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582016000200345

DYNAMIC ECONOMIC ANALYSIS OF A RESIDUE MANAGEMENT SYSTEM IN COTTON
Provedor de dados: 31
Autores: Paudel,   Krishna P.; Lohr,   Luanne.
Residue management system (RMS), comprised of no till cultivation, a winter cover crop, and poultry litter, could be an alternative to existing management system in cotton production in the Georgian Piedmont.  We compare the productivity and profitability of RMS with the current system over time, focusing on the role of organic matter.  Using dynamic bioeconomic modelling technique, we show that the net return and land value difference between these two systems increase as the terminal period increases.  We conclude that if financial and capital markets based on organic matter work efficiently, farmers will choose RMS in cotton production.
Tipo: Working or Discussion Paper
Palavras-chave: Residue management; Organic matter; Productivity; Crop Production/Industries.
Ano: 1998
URL: http://purl.umn.edu/16677

ECONOMIC EFFECT OF IMPERFECT INFORMATION ON CONSERVATION DECISIONS
Provedor de dados: 31
Autores: Paudel,   Krishna P.; Lohr,   Luanne.
Cotton farmers in the Piedmont region incorrectly believe conservation systems with winter cover crop and no-till cultivation yield less than conventional systems.  We model the effect of organic matter on productivity and show how ignoring this effect causes returns to be underestimated.  Farmers with imperfect information underinvest in residue management.
Tipo: Working or Discussion Paper
Palavras-chave: Residue management; Organic matter; Productivity; Comparative statics; Farm Management; Land Economics/Use; Productivity Analysis.
Ano: 1996
URL: http://purl.umn.edu/16645

Contrasts in Areas of Rubber Tree Clones in Regard to Soil and Biomass Carbon Stocks
Provedor de dados: 90
Autores: Diniz,Anderson Ribeiro; Pereira,Marcos Gervasio; Balieiro,Fabiano de Carvalho; Silva,Eduardo Vinicius da; Santos,Felipe Martini; Lisboa,Francy Junio Gonçalves; Oliveira,Aldo Bezerra de; Cruz,Renato Barbosa da.
ABSTRACT Rubber tree (Hevea brasiliensis) crop may accumulate significant amounts of carbon either in biomass or in the soil. However, a comprehensive understanding of the potential of the C stock among different rubber tree clones is still distant, since clones are typically developed to exhibit other traits, such as better yield and disease tolerance. Thus, the aim of this study was to address differences among different areas planted to rubber clones. We hypothesized that different rubber tree clones, developed to adapt to different environmental and biological constrains, diverge in terms of soil and plant biomass C stocks. Clones were compared in respect to soil C stocks at four soil depths and the total depth (0.00-0.05, 0.05-0.10, 0.10-0.20,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hevea brasiliensis; Organic matter; Carbon sequestration.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000501378

Physical properties of an Alfisol and no-till soybean yield
Provedor de dados: 90
Autores: Tavares Filho,João; Guimarães,Maria de Fátima; Curmi,Pierre; Tessier,Daniel.
It is known that any kind of soil management causes changes in the soil physical characteristics and can affect agricultural yield. The purpose of this study was to evaluate soil properties of an Alfisol and soybean yield under different management systems for no-tillage annual crops, no-tillage with chiseling and no-tillage crop rotation. The 11-year experiment was initiated in the 1998/99 growing season, on 100 x 30 m plots (11 % slope). Soil samples (5 per management system) were systematically collected (0-25 cm layer) in the summer growing season, to quantify soil organic matter, bulk density, macroporosity and flocculation, as well as soybean yield. The highest values for soil bulk density and organic matter content and the lowest for macroporosity...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No tillage; Soil physical properties; Organic matter; Crop rotation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100026

Mild and Moderate Extraction Methods to Assess Potentially Available Soil Organic Nitrogen
Provedor de dados: 90
Autores: Braos,Bruno Boscov; Ferreira,Manoel Evaristo; Cruz,Mara Cristina Pessôa da; Braos,Lucas Boscov; Barbosa,José Carlos.
ABSTRACT The use of chemical methods to assess the soil organic nitrogen (N) potentially available to plants is not a common practice in Brazil. However, associated with others, this tool might improve efficiency in the use of waste and nitrogen fertilizers. In our study, chemical methods were tested to assess potentially available soil N in samples of 17 representative soils of the western plateau of the state of São Paulo (10 Oxisols and 7 Ultisols). Available soil N was extracted from the collected soil samples using moderate (ISNT-Illinois Soil Nitrogen Test) and mild (hot water and heated solutions of 2 mol L-1 KCl and 0.01 mol L-1 CaCl2) extraction methods. The levels of potentially available N obtained from these chemical methods were correlated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical analysis; Organic matter; Mineralization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100422

Spatial variability of aggregate stability in latosols under sugarcane
Provedor de dados: 90
Autores: Souza,Zigomar Menezes de; Marques Júnior,José; Pereira,Gener Tadeu; Sáenz,Carolina Maria Sánchez.
The spatial variability of soils under a same management system is differentiated, as expressed in the properties. The spatial variability of aggregate stability of a eutrophic Red Latosol (ERL) and a dystrophic Red Latosol (DRL) under sugarcane was characterized. Samples were collected in a regular 10 m grid, in the layers 0.0-0.2 and 0.2-0.4 m, with 100 points per area, and the following properties were determined: geometric mean diameter (GMD) of aggregates, mean weight diameter (MWD) of aggregates, percent of aggregates in the &gt; 2.0 mm class and organic matter (OM) content. The eutrophic Red Latosol (ERL) had a higher aggregate stability thn the dystrophic Red Latosol (DRL), which may be attributed to the higher clay and OM content and the gibbsitic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spatial distribution; Physical properties; Organic matter; Saccharum officinarum.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200002

Chemical and microbiological attributes of an oxisol treated with successive applications of sewage sludge¹
Provedor de dados: 90
Autores: Bueno,José Rafael Pires; Berton,Ronaldo Severiano; Silveira,Adriana Parada Dias da; Chiba,Marcio Koiti; Andrade,Cristiano Alberto de; Maria,Isabella Clerici De.
Studies on sewage sludge (SS) have confirmed the possibilities of using this waste as fertilizer and/or soil conditioner in crop production areas. Despite restrictions with regard to the levels of potentially toxic elements (PTE) and pathogens, it is believed that properly treated SS with low PTE levels, applied to soil at adequate rates, may improve the soil chemical and microbiological properties. This study consisted of a long-term field experiment conducted on a Typic Haplorthox (eutroferric Red Latosol) treated with SS for seven successive years for maize production, to evaluate changes in the soil chemical and microbiological properties. The treatments consisted of two SS rates (single and double dose of the crop N requirement) and a mineral...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Municipal waste; Organic matter; Soil microbes; Maize.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400040

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

Termite Mounds Effects on Soil Properties in the Atlantic Forest Biome
Provedor de dados: 90
Autores: Lima,Sandra Santana de; Pereira,Marcos Gervasio; Pereira,Renato Nunes; Pontes,Rafael Moura de; Rossi,Celeste Queiroz.
ABSTRACT Termites have peculiar activities in the soil, inducing significant changes in the soil properties. The objective of this study was to assess physical and chemical properties and soil organic matter to evaluate the effect of termite activity and termite mounds on the soil. Two toposequences were selected and divided in slope thirds (shoulder, backslope, and footslope). In each of these, four termite mounds were selected. Samples were taken from the soils and termite mounds (top, center, and base) along with a variety of termites for identification. Analyses were carried out for physical, soil texture, and chemical properties, as well as for particle size and chemical fractioning of organic matter. The species Cornitermes cumulans was found in all...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isoptera; Termitaria; Macronutrients; Organic matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100406

Structural changes and degradation of Red Latosols under different management systems for 20 years
Provedor de dados: 90
Autores: Tavares Filho,João; Melo,Thadeu Rodrigues de; Machado,Wesley; Maciel,Bruno Vieira.
Soils are the foundation of terrestrial ecosystems and their role in food production is fundamental, although physical degradation has been observed in recent years, caused by different cultural practices that modify structures and consequently the functioning of soils. The objective of this study was to evaluate possible structural changes and degradation in an Oxisol under different managements for 20 years: no-tillage cultivation with and without crop rotation, perennial crop and conventional tillage, plus a forested area (reference). Initially, the crop profile was described and subsequently, 10 samples per management system and forest soil were collected to quantify soil organic matter, flocculation degree, bulk density, and macroporosity. The results...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Profile; Soil physical properties; Organic matter; Soil quality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000400025

Modelling of soil penetration resistance for an oxisol under no-tillage
Provedor de dados: 90
Autores: Tavares Filho,João; Feltran,Clarissa Tieme Matsuda; Oliveira,José Francirlei de; Almeida,Edinei de.
Soil penetration resistance is an important property that affects root growth and elongation and water movement in the soil. Since no-till systems tend to increase organic matter in the soil, the purpose of this study was to evaluate the efficiency with which soil penetration resistance is estimated using a proposed model based on moisture content, density and organic matter content in an Oxisol containing 665, 221 and 114 g kg-1 of clay, silt and sand respectively under annual no-till cropping, located in Londrina, Paraná State, Brazil. Penetration resistance was evaluated at random locations continually from May 2008 to February 2011, using an impact penetrometer to obtain a total of 960 replications. For the measurements, soil was sampled at depths of 0...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No-till; Compaction; Physical properties; Organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100010

Soil aggregation and organic carbon of Oxisols under coffee in agroforestry systems
Provedor de dados: 90
Autores: Guimarães,Gabriel Pinto; Mendonça,Eduardo de Sá; Passos,Renato Ribeiro; Andrade,Felipe Vaz.
Intensive land use can lead to a loss of soil physical quality with negative impacts on soil aggregates, resistance to root penetration, porosity, and bulk density. Organic and agroforestry management systems can represent sustainable, well-balanced alternatives in the agroecosystem for promoting a greater input of organic matter than the conventional system. Based on the hypothesis that an increased input of organic matter improves soil physical quality, this study aimed to evaluate the impact of coffee production systems on soil physical properties in two Red-Yellow Oxisols (Latossolos Vermelho-Amarelos) in the region of Caparaó, Espirito Santo, Brazil. On Farm 1, we evaluated the following systems: primary forest (Pf1), organic coffee (Org1) and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Degree of flocculation; Macroaggregates; Porosity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000100028

Water-dispersible clay in soils treated with sewage sludge
Provedor de dados: 90
Autores: Tavares Filho,João; Barbosa,Graziela Moraes de Césare; Ribon,Adriana Aparecida.
A by-product of Wastewater Treatment Stations is sewage sludge. By treatment and processing, the sludge is made suitable for rational and environmentally safe use in agriculture. The aim of this study was to assess the influence of different doses of limed sewage sludge (50 %) on clay dispersion in soil samples with different textures (clayey and medium). The study was conducted with soil samples collected from native forest, on a Red Latosol (Brazilian classification: Latossolo Vermelho distroférrico) loamy soil in Londrina (PR) and a Red-Yellow Latosol (BC: Latossolo Vermelho-Amarelo distrófico) medium texture soil in Jaguapitã (PR). Pots were filled with 3 kg of air-dried fine earth and kept in greenhouse. The experiment was arranged in a randomized...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biosolids; Flocculation; PZC; ΔpH; Organic matter.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500005

Forms of phosphorus in an oxisol under different soil tillage systems and cover plants in rotation with maize
Provedor de dados: 90
Autores: Carvalho,Arminda Moreira de; Bustamante,Mercedes Maria da Cunha; Almondes,Zayra Azeredo do Prado; Figueiredo,Cícero Célio de.
Phosphorus fractions play a key role in sustaining the productivity of acid-savanna Oxisols and are influenced by tillage practices. The aim of this study was to quantify different P forms in an Oxisol (Latossolo Vermelho-Amarelo) from the central savanna region of Brazil under management systems with cover crops in maize rotation. Three cover crops (Canavalia brasiliensis, Cajanus cajan (L.), and Raphanus sativus L.) were investigated in maize rotation systems. These cover crops were compared to spontaneous vegetation. The inorganic forms NaHCO3-iP and NaOH-iP represented more than half of the total P in the samples collected at the depth of 5-10 cm during the rainy season when the maize was grown. The concentration of inorganic P of greater availability...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Available phosphorus; Phosphorus sequential fractionation; Organic phosphorus; Inorganic phosphorus.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300029

Liquid Bovine Biofertilizer and Cultivation Effects on the Porosity of a Typic Haplocambids as a Function of Cultivation and Dose
Provedor de dados: 90
Autores: Alencar,Thiago Leite de; Chaves,Arilene Franklin; Freire,Alcione Guimarães; Assis Júnior,Raimundo Nonato de; Mota,Jaedson Cláudio Anunciato.
ABSTRACT The soil porous space is where processes related to gases and soil solution occur, and provides an adequate guide for agricultural practices. This study aimed to evaluate the integrated effects of cultivation and the application of liquid bovine biofertilizer on the porous network of a Typic Haplocambids (Cambissolo Háplico Ta Eutrófico) cultivated with figs (Ficus carica L.). Four treatments were evaluated (under fig cultivation with the application of 20, 40 and 60 % of biofertilizer through irrigation, a control treatment without biofertilizer and an additional treatment – soil under natural vegetation). Disturbed and undisturbed soil samples were collected in three soil layers (0.0-0.1, 0.1-0.2 and 0.2-0.3 m) with four replicates. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil physics; Soil porosity; Organic matter.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100414

Paleoenvironmental Characterization of a High-Mountain Environment in the Atlantic Forest in Southeastern Brazil
Provedor de dados: 90
Autores: Silva Neto,Eduardo Carvalho da; Santos,Jaqueline Jesus Santana dos; Pereira,Marcos Gervasio; Maranhão,Deyvid Diego Carvalho; Barros,Fabiana da Costa; Anjos,Lúcia Helena Cunha dos.
ABSTRACT: Records of changes in the phytosociological structure of vegetation can be observed more clearly in soils that have more significant accumulation of organic matter, like those occurring in high-mountain environments. The aim of this study was to characterize soils formed in high-mountain environments in the Itatiaia National Park (INP), state of Rio de Janeiro, southeastern Brazil, and to discuss the potential of preserved phytoliths as markers of vegetative history and environmental factors. Four profiles were selected, which were morphologically described and evaluated for their physical and chemical properties. For phytolith analysis and high-resolution determination of the stable carbon isotopes, samples were collected at 0.10 m intervals....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil memory; Pedogenesis; Histosols; Folist soils; Organic matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100312

Macronutrients in watermelon plants fertilized with potassium and cattle manure
Provedor de dados: 91
Autores: Nascimento,José A. M. do; Souto,Jacob S.; Pereira,Walter E.; Medeiros,Sherly A. da S.; Cavalcante,Lourival F.
ABSTRACT Potassium is the nutrient required in greatest quantity by watermelon, especially during the production phase. Therefore, the aim of this experiment was to evaluate the effect of potassium and cattle manure doses on the nutritional composition of ‘Crimson Sweet’ watermelon plants. The treatments were arranged in a randomized block design with three replicates and 21 plants per plot using a 3 × 5 + 1 factorial scheme, referring to three manure doses (0; 1,100 and 2,520 g hole-1), in order to increment the level of soil organic matter from 0.67 present in the soil to 3.0 and 6.0%, five potassium doses (0, 7.5, 15, 22.5 and 30 kg ha-1) in the form of potassium chloride and one additional treatment (without organic and mineral fertilization). At the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Citrullus lanatus; Organic matter; Mineral nutrition.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900836

Organic fertilization to attenuate water salinity effect on papaya growth
Provedor de dados: 91
Autores: Sousa,Mônica S. da S.; Lima,Vera L. A. de; Brito,Marcos E. B.; Silva,Luderlândio de A.; Moreira,Rômulo C. L.; Oliveira,Carlos J. A.
ABSTRACT The salinity of water and soil reduces the growth and production of crops, especially the fruit trees, such as papaya. Thus, it is necessary to obtain management alternatives for cultivation under these conditions. Therefore, the objective of this study was to evaluate the growth and phytomass of papaya cultivated under irrigation with saline water and organic fertilization. An experiment was set up using a randomized block design, with the treatments distributed in a 5 x 2 factorial scheme, consisting of five levels of salinity of irrigation water (0.6, 1.2, 1.8, 2.4 and 3.0 dS m-1) and two levels of organic fertilization (10 and 20 L of bovine manure per plant), with three replications, totaling thirty experimental plots. Growth variables of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Saline stress; Organic matter.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000200079

SOIL ATTRIBUTES THREE YEARS AFTER MAKING RIDGES AND OR DRAINS FOR PLANTING GRAPEVINE ROOTSTOCK
Provedor de dados: 94
Autores: VEIGA,MILTON DA; DAMBRÓS,REMI NATALIN; DALBÓ,MARCO ANTÔNIO.
RESUMO Os atributos do solo estão relacionados com o desenvolvimento e a produção das culturas, tanto anuais como perenes. O presente trabalho teve como objetivo determinar os atributos químicos e físicos do solo três anos após a aplicação de sistemas de manejo para implantação de porta-enxertos de videira, em um Nitossolo Vermelho com textura muito argilosa. Os sistemas de manejo consistiram na confecção ou não de camalhões e/ou de drenos antes da implantação das mudas de porta-enxertos Dog Ridge. Os atributos químicos (pH em água e teores de matéria orgânica e de macronutrientes) foram determinados em amostras coletadas na linha da cultura, nas camadas de 0-0,1; 0,1-0,2; 0,2-0,3 e 0,3-0,4 m de profundidade. Os atributos físicos do solo (teor de argila,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PH; Organic matter; Macronutrients; Bulk density; Porosity; Penetration resistance; Vitis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452015000300797

Spatial variability of forage yield and soil physical attributes of a Brachiaria decumbens pasture in the Brazilian Cerrado
Provedor de dados: 96
Autores: Pariz,Cristiano Magalhães; Carvalho,Morel de Passos e; Chioderoli,Carlos Alessandro; Nakayama,Fernando Takayuki; Andreotti,Marcelo; Montanari,Rafael.
The objective of this study was to analyze variability, linear and spatial correlations of forage dry mass yield (FDM) and dry matter percentage (DM%) of Brachiaria decumbens with the bulk density (BD), gravimetric (GM) and volumetric (VM) moisture, mechanical resistance to penetration (RP) and organic matter content (OM), at depths 1 (0-0.10 m) and 2 (0.10-0.20 m), in a Red Latosol (Oxisol), in order to select an indicator of soil physical quality and identify possible causes of pasture degradation. The geostatistical grid was installed to collect soil and plant data, with 121 sampling points, over an area of 2.56 ha. The linear correlation between FDM × DM% and FDM × BD2 was low, but highly significant. Spatial correlations varied inversely and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bulk density; Geostatistics; Gravimetric and volumetric moisture; Mechanical resistance to penetration; Organic matter.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001000007

Growth and gas exchange in cowpea plants under different managements and saline conditions
Provedor de dados: 124
Autores: Silva,Weslley Costa; Moura,Joana Gomes de; Oliveira,Alexandre Bosco de; Ferreira,Leonardo Elias; Silva,Tatiana Maria da.
ABSTRACT The cowpea is one of the main crops of economic and social importance in the northeast of Brazil. However, the growing need to increase crop yield has prompted the use of irrigation water with high levels of salts. The aim of this study therefore, was to evaluate the effects of different irrigation depths and rates of liquid biofertilizer on growth and gas exchange in cowpea plants under saline conditions. The experiment was conducted in a randomized block design, using a scheme of split lots consisting of four irrigation depths with saline water (75, 100, 125 and 150% of crop evapotranspiration - ETc) and sub-lots of four different doses of biofertilizer (0; 5,000; 10,000 and 15,000 L ha-1). At 75 days after sowing (DAS), readings were taken of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Vigna unguiculata (L.) Walp; Water stress; Organic matter.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000500756

Microbial soil quality indicators under different crop rotations and tillage management
Provedor de dados: 124
Autores: Ferreira,Enderson Petrônio de Brito; Santos,Henrique Pereira dos; Costa,Janaina Ribeiro; De-Polli,Helvécio; Rumjanek,Norma Gouvêa.
An experiment was carried out under field conditions to assess the effects of soil management (no-tillage- NT and conventional tillage- CT) and crop rotation systems on microbial biomass-C (Cmic), basal soil respiration (BSR), metabolic quotient (qCO2), soil organic carbon content (Corg) and microbial carbon to organic carbon ratio (Cmic/Corg). Soil samples were collected on an area cultivated with wheat as winter crop and soybean as summer crop, both in rotation with vetch, maize and oats. Samples were also collected in a secondary forest used as reference. Data of each management system (NT and CT) were compared to forest area by "t" test (p&lt;0.05) and crop rotations were compared by Tukey test (p&lt;0.05). All data were submitted to multivariate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial biomass; Microbial respiration; Organic matter; Soil management.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000200002

Characterization of cover crops by NMR spectroscopy: impacts on soil carbon, nitrogen and phosphorus under tillage regimes
Provedor de dados: 124
Autores: Carvalho,Arminda Moreira de; Marchão,Robélio Leandro; Bustamante,Mercedes Maria da Cunha; Alcântara,Flávia Aparecida de; Coser,Thais Rodrigues.
The objective of this study was to investigate the chemical composition of cover crops by solid-state CPMAS 13C NMR spectroscopy and its effects on carbon, nitrogen and phosphorus in a Typic Acrustox. Cover crops (Crotalaria juncea, Canavalia brasiliensis, Cajanus cajan, Mucuna pruriens and Raphanus sativus) and natural fallow were studied in rotation with maize under conventional and no-tillage regimes. Tissues of Crotalaria juncea, Canavalia brasiliensis, Mucuna pruriens and Raphanus sativus were analyzed using CPMAS 13C NMR spectroscopy. Soil samples were collected at the end of the growing season of the cover crops (September 2002) and during the grain filling period in corn from 0-5 and 5-10 cm layers. Cajanus cajan presented the lowest content of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazilian Savanna; Solid-state CPMAS 13C NMR spectroscopy; Organic matter; Ecological Intensification.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000500012

Biosolids and heavy metals in soils
Provedor de dados: 63
Autores: Silveira,Maria Lucia Azevedo; Alleoni,Luís Reynaldo Ferracciú; Guilherme,Luiz Roberto Guimarães.
The application of sewage sludge or biosolids on soils has been widespread in agricultural areas. However, depending on their characteristics, they may cause increase in heavy metal concentration of treated soils. In general, domestic biosolids have lower heavy metal contents than industrial ones. Origin and treatment method of biosolids may markedly influence their characteristics. The legislation that controls the levels of heavy metal contents in biosolids and the maximum concentrations in soils is still controversial. In the long-term, heavy metal behavior after the and of biosolid application is still unknown. In soils, heavy metals may be adsorbed via specific or non-specific adsorption reactions. Iron oxides and organic matter are the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sewage sludge; Adsorption; Speciation; PH; Organic matter.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400029

Carbon pool ratios as scientific support to field morphology in the differentiation of dark subsurface soil horizons
Provedor de dados: 63
Autores: 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

Liming and electrochemical attributes of an oxisol under no tillage
Provedor de dados: 63
Autores: Alleoni,Luís Reynaldo Ferracciú; Zambrosi,Fernando César Bachiega; Moreira,Silvino Guimarães; Prochnow,Luís Ignácio; Pauletti,Volnei.
No tillage areas are increasing in Brazil especially due to a general improvement in water and nutrient availability to plants. Few results have reported the effect of liming on soil electrochemical attributes in areas under the no tillage system. This study was conducted to evaluate the effect of liming (at the soil surface and incorporated to 0.2 m) on soil pH, point of zero salt effect (PZSE), electric potential, soil organic matter (SOM), and yield of soybean and corn, cultivated on an Typic Hapludox, submitted 12 years to no tillage. Rates of lime of 1/3, 2/3 and the total amount calculated for soil to reach a base saturation of 70 % (2.5 ton ha-1) were applied on soil surface. The full rate was also applied and incorporated to the 0.2 m depth. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PSSE; Organic matter; Electric potential.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100018

Contribution of organic amendments to soil properties and survival of Stenocarpella on maize stalk
Provedor de dados: 63
Autores: Faria,Mírian Rabelo de; Guimarães,Rafaela Araújo; Pinto,Felipe Augusto Moretti Ferreira; Siqueira,Carolina da Silva; Silva,Carlos Alberto; Medeiros,Flávio Henrique Vasconcelos de; Bettiol,Wagner.
ABSTRACT: The incorporation of organic matter to the soil not only improves nutrient content, but also reduces the survival of Stenocarpella, the causal agent of stalk rot, Diplodia ear rot, and grey leaf spot, in maize stubble. We evaluated the effect of organic waste incorporation on Stenocarpella survival in maize stalks, the activity of suppressiveness-related enzymes, and nutrient contents. We conducted the assays in the municipalities of Lavras and Sete Lagoas, Minas Gerais State, Brazil. Maize stalks infested with Stenocarpella were kept in field conditions for three months after poultry litter, swine manure, fish hydrolysate, compost sewage sludge, and urea application. Infested stalks, without residue amendment, were kept on surface or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stenocarpella maydis; Stenocarpella macrospora; Zea mays; Stalk rot; Organic matter.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601201

Organic residue, limestone, gypsum, and phosphorus adsorption by lowland soils
Provedor de dados: 63
Autores: Andrade,Alex Teixeira; Fernandes,Luiz Arnaldo; Faquin,Valdemar.
Organic residue application is a low cost alternative to reduce the use of inorganic fertilizers and correctives. In order to study the effect of organic residues, limestone and gypsum application on phosphorus adsorption by lowland soils, four experiments were carried out. A Mesic Organosol (OY), a Melanic Gleysol (MG), a Haplic Gleysol (GX), and a Fluvic Neosol (RU) were used in a completely randomized design and factorial scheme (3 x 2), with five replicates: three soil amendment practices (limestone, gypsum and no corrective) and two levels of organic residue (with and without corral manure). Soil samples were incubated for 60 days, with and without organic residue incorporation. After this period, we applied the corrective and incubated the soil for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Liming; Gypsum; Organic matter.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162002000200022

Rock biofertilizer and earthworm compost on sugarcane performance and soil attributes in two consecutive years
Provedor de dados: 63
Autores: Stamford,Newton Pereira; Simões Neto,Djalma Eusébio; Freitas,Ana Dolores Santiago de; Oliveira,Emídio Cantídio Almeida; Oliveira,Wagner Silva; Cruz,Leila.
ABSTRACT The deployment of soluble fertilizers has been one of the most commonly applied agricultural practices in the bid to increase crop yield. However, the production of soluble fertilizers has a considerable economic cost and consumes a substantial amount of energy. In general, soil organic matter provides the nutrients needed for plant growth in organic agriculture. However, these nutrients are not sufficient if the best yield is to be obtained. The aim of our field experiment was to evaluate the effectiveness of phosphate and potassic sources (rocks, bio-fertilizers and soluble fertilizers) based on several sugarcane characteristics and soil attributes. Our experiment was conducted over two consecutive years, and we assessed the effect of using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acidithiobacillus; Organic fertilization; Organic matter; Soil nutrients; Sulfur oxidation.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000100029

Soil carbon stock and humification in pastures under different levels of intensification in Brazil
Provedor de dados: 63
Autores: Segnini,Aline; Xavier,Alfredo Augusto Pereira; Otaviani-Junior,Pedro Luis; Oliveira,Patrícia Perondi Anchão; Pedroso,André de Faria; Praes,Maria Fernanda Ferreira Menegucci; Rodrigues,Paulo Henrique Mazza; Milori,Débora Marcondes Bastos Pereira.
ABSTRACT: Intensive management of tropical pastures has shown potential for greenhouse gas (GHG) mitigation due to high forage production and C accumulation in the soil. This study aimed to evaluate different pasture management options in relation to their effect on soil C stocks and soil organic matter (SOM) humification. Pastures in four beef cattle production systems were assessed: intensive and irrigated pasture with high stocking rate (IHS); dryland pasture with high stocking rate (DHS); dryland pasture with moderate stocking rate (DMS); degraded pasture (DP). The soil under the native forest was also evaluated and soil carbon stocks from the 0-100 and 0-30 cm layers were assessed. Carbon stocks (0-100 cm) ranged from 99.88 to 142.33 Mg ha−1 in DP and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest biome; Brazilian livestock systems; Laser-Induced Fluorescence Spectroscopy; Humification index; Organic matter.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019000100033

Tillage, fertilization systems and chemical attributes of a Paleudult
Provedor de dados: 63
Autores: Dorneles,Evelyn Penedo; Lisboa,Bruno Brito; Abichequer,André Dabdab; Bissani,Carlos Alberto; Meurer,Egon José; Vargas,Luciano Kayser.
Tillage and fertilization methods may affect soil fertility. With the aim of assessing changes in soil chemical properties over a period of ten years, soil samples of a Paleudult were collected over nine seasons at three layer depths (0-5, 5-10, 10-20 cm) and were chemically analyzed. Grain yield and nutrient export in two summer crops, soybean (Glycine max) and corn (Zea mays), in a field experiment set in Eldorado do Sul, in the state of Rio Grande do Sul, Brazil, were determined. Three soil tillage systems were evaluated, conventional (CT), reduced (RT) and no-tillage (NT), combined with mineral (lime and fertilizers) and organic (poultry litter) fertilization. The no-tillage system stood out as compared to the others, especially in the surface layer,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil fertility; Conventional tillage; No-tillage; Organic matter; Cation exchange capacity.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000200175

Cattle manure fertilization increases fig yield
Provedor de dados: 63
Autores: Leonel,Sarita; Tecchio,Marco Antonio.
Fertilization using organic compounds is complementary to chemical fertilization, being essential to integrated fruit production. Reports on fig tree (Ficus carica L.) organic fertilization and mineral nutrition are worldwide scarce, especially in Brazil. This experiment aimed to evaluate the effects of cattle manure fertilization on the yield and productivity of the fig tree 'Roxo de Valinhos' in Botucatu, São Paulo State, Brazil, during the 2002/03, 2003/04, 2004/05 and 2005/06 crop cycles. Plants aged one, two, three and four year olds received the following cattle manure treatments: control (no fertilizer), 25%, 50%, 75%, 100%, 125% and 150% of the recommended N level for this crop. The evaluated variables were: fruit number, weight and mean diameter,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ficus carica L.; Nitrogen; Organic matter.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000600013

Organic matter decomposition and microarthropod community structure in corn fields under low input and intensive management in Guaíra (SP)
Provedor de dados: 63
Autores: Rodrigues,G.S; Ligo,M.A.V; Mineiro,J.L. de C.
The rate of organic matter decomposition and the structure of the communities of microarthropods were compared between two corn fields receiving contrasting agricultural management practices (low input and intensive farming). The rate of decomposition tended to be higher in the intensively managed field in the beginning of the growing season, but decreased to a level significantly lower than the observed in the low input field by the end of the growing season. This suggested that the biological community associated with the decomposition process could be negatively influenced in the intensively managed field. Analyses of the structure of microarthropod communities indicated differences between the two areas. The microarthropod populations present in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil fauna; Organic matter; Decomposition; Agroecosystems; Farming systems; Low-input agriculture.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000100010

ผลของการใช้กากถั่วเหลืองหมักในสูตรอาหารต่อการย่อยได้ของโภชนะในลูกสุกรหย่านม
Provedor de dados: 106
Autores: Daorung Sila-on; Chanika Chanthasa.
The objective of this study was to examine effect of using fermented soybean meal with pineapple peel juice in diet on nutrients digestibility in weaning pigs. Twelve male weaning pigs, 5-weeks-old were used in a completely randomized design (CRD). There were 4 treatments; group 1 and 2 were 22% protein diet with soybean meal and fermented soybean meal, respectively and group 3 and 4 were 20% protein diet with soybean meal and fermented soybean meal, respectively. The result was found that digestibility of dry matter, organic matter, protein, fat, fiber and ash in all groups were not statistically significant difference (P&gt;0.05). Therefore, the use of fermented soybean meal with pineapple peel juice 22% and 20% in diet did not affect nutrients...
Tipo: PhysicalObject
Palavras-chave: Weaning pigs; Soybean meal; Fermented soybean meal; Pineapple peel juice; Digestive system; Nutrients digestibility; Dry matter; Organic matter; Protein; Fat; Fiber; Ash; Feed production; ลูกสุกรหย่านม; กากถั่วเหลือง; เปลือกสับปะรด; ระบบการย่อยอาหาร; การย่อยอาหาร; ประสิทธิภาพการย่อยได้; ประสิทธิภาพการย่อยโปรตีน; ประสิทธิภาพการย่อยไขมัน; ประสิทธิภาพการย่อยเยื่อใย; ประสิทธิภาพการย่อยอินทรีย์วัตถุ; คุณค่าทางโภชนะ; สูตรอาหารสัตว์.
Ano: 2014
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5757

การปรับปรุงดินก่อนปลูกอ้อยโดยใช้ประโยชน์จากวัชพืชในธรรมชาติ และวัสดุหรือพืชบำรุงดินชนิดต่างๆ
Provedor de dados: 106
Autores: Santimaitree Gonkhamdee; Prasit Jaisil; Wanwipa Kaewpradit Polpinit; Tassanee Wongphet.
Tipo: PhysicalObject
Palavras-chave: Sugarcane; Sugarcane production; Soil improvement; Weed; Green manure; Upland rice; Crotalaria juncea; Filter cake; Soil amendment; Fallow; Soil management; Organic matter; Total nitrogen; Available phosphorus; อ้อย; การปลูกอ้อย; การปรับปรุงดิน; วัชพืช; พืชบำรุงดิน; ข้าวไร่; ปอเทือง; วัสดุปรับปรุงดิน; กากตะกอนหม้อกรอง; การจัดการดิน; อินทรียวัตถุ; ปริมาณไนโตรเจนทั้งหมด; ปริมาณฟอสฟอรัสที่เป็นประโยชน์; การเพิ่มความอุดมสมบูรณ์ดิน; วิธีการที่เหมาะสม; การลดต้นทุนการผลิต.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5823

Plant growth and yield of butter kale (Brassica olerácea L. var. acephala), as influenced by the combined application of bovine manure and rock powder
Provedor de dados: 109
Autores: Pereira,Micaela B.; Dias,Thiago J.; Lima,Neriane R.; Justino,Evandra S.; Oliveira,Daivyd S.; Martins-Veras,Mario L.
Abstract The supply of organic matter in soil of arid and semiarid in Brazilian regions is very import, as it allows to increase crop yields. However, there are few studies on alternative sources of fertilizer for vegetables. Therefore, the objective was to evaluate the effect of different doses of bovine manure and rock powder (RP) on growth characteristics, concentration of chlorophyll, and physiological indices and production of (B. oleracea L. var. acephala). The treatments were arranged in five randomized blocks in a factorial 4 x 4 reference doses of bovine manure (60, 120, 180 and 240 g pit-1) combined with doses of rock powder (6, 12, 18 and 24 g pit-1). Doses of bovine manure and rock powder of 180 and 18 g, respectively, increased the growth of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassica oleracea; Agricultural fertilizers; Organic matter.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122020000100038

Plant growth evaluation of Cajanus cajan (L.) Millsp., Canavalia ensiformis (L.) DC. and Cratylia argentea (Desvaux) O. Kuntze., in soils degraded by sand and gravel extraction
Provedor de dados: 109
Autores: Vargas-Zapata,Mateo; López-Isaza,Juan Guillermo; Restrepo-Betancur,Luis Fernando; Ayala-Lopera,Silvio; Medina-Sierra,Marisol.
Abstract In this research, the adaptability of pigeon pea (Cajanus cajan (L.) Millsp., canavalia (Canavalia ensiformis (L.) DC.) and veranera (Cratylia argentea (Desvaux) O. Kuntze) species, was evaluated in soils degraded by sand and gravel extraction. The three species were planted in bags as follows: 20 x 10cm, each with 3 seeds, with a substrate 2:1 soil and sand, respectively. The plants were grown under shadow conditions with 50% for 60 days, and received irrigation according to climate conditions. Therefore, were transplanted at field conditions, plant height (PH), fully developed leaves (FDL) and stem diameter (SD) variables, were measured every week for 10 weeks. A randomized block design was used with a fixed balanced effect. The number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adaptability; Erosion; Legumes; Losses from soil; Organic matter; Soil physicochemical properties.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400580

Flood pulse and spatial dynamics of mercury in sediments in Puruzinho lake, Brazilian Amazon
Provedor de dados: 36
Autores: Almeida,Ronaldo de; Bernardi,José Vicente Elias; Oliveira,Ronaldo Cavalcante; Carvalho,Dario Pires de; Manzatto,Angelo Gilberto; Lacerda,Luiz Drude de; Bastos,Wanderley Rodrigues.
The study was conducted in Puruzinho lake (Humaitá, AM) considering seasonal periods of rainy and dry in way to elucidate the flood pulse importance in the deposition, remobilization and distributions of mercury and organic matter in bottom sediments in the Madeira River Basin (Brazilian Amazon). Bottom sediments and soils samples were analyzed for total mercury and organic matter. Mercury concentrations obtained in bottom sediment were 32.20-146.40 ng g-1 and organic matter values were 3.5 - 18.0%. The main region for accumulation of mercury and organic matter was in the central and deepest lake area In the rainy season there was a greater distribution of Hg and organic matter, mainly controlled by means of income of the Madeira river water during...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Indicator kriging; Madeira river; Seasonality.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000100010

Immature life cycle of laboratory-reared Phylloicus elektoros and Phylloicus amazonas (Trichoptera: Calamoceratidae) from a central Amazonian stream
Provedor de dados: 36
Autores: MARTINS,Renato Tavares; SOARES,Kleicy Maciel; HAMADA,Neusa.
ABSTRACT We reared field-collected egg masses of the caddisflies Phylloicus amazonas (n = 2) and Phylloicus elektoros (n = 7) to adulthood. First instar larvae of both species hatched up to five days after field collection. Median development time from first larval instar to adult was 229 days for P. amazonas and 275 for P. elektoros, including the pupal development time (median of 13.5 and 16 days, respectively). Shredder organisms have been used frequently in studies related to organic matter processing in freshwater ecosystems. The biological information reported in here may be useful for the design of experimental studies in the field or under laboratory conditions.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Aquatic insects; Development time; Life stages; Organic matter; Shredders.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672021000100067

The effect of different soil properties on arbuscular mycorrhizal colonization of peanuts, sorghum and maize
Provedor de dados: 39
Autores: Carrenho,Rosilaine; Trufem,Sandra Farto Botelho; Bononi,Vera Lúcia Ramos; Silva,Eraldo Schunk.
Arbuscular mycorrhizal fungi (AMF) are important for plant growth since they increase mineral influx. However, symbiosis efficiency is affected by many environmental factors. This study evaluated the effects of different treatments (+/- phosphorus; +/- liming; +/- organic matter; field, sandy or clayey soil textures) on root colonization (RC) of peanuts, sorghum and maize. The combination of these resulted in seventy-two treatments. The 2×2×2×3×3 factorial experiment was laid out in a randomized design. All data were subjected to variance analysis and the means were compared (Tukey at P&lt;0.05). Three months after seed germination, roots were collected to evaluate the percentage of RC. Results showed that soil texture and liming were the most important...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mycorrhiza; Liming; Soil texture; Organic matter; Phosphorus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000300018

Depth distribution of exchangeable aluminum in acid soils: A study from subtropical Brazil
Provedor de dados: 1
Autores: Rabel, Diego Oliveira; Motta, Antonio Carlos Vargas; Barbosa, Julierme Zimmer; Melo, Vander Freitas; Prior, Stephen Arthur.
Due to potential crop toxicity, high aluminum (Al) availability requires increased attention when preparing agricultural soils. However, research examining the relationship between depth distribution of Al and soil weathering has received little priority in Brazil, particularly regarding the number of soil profiles investigated. This study analyzed 38 acid soils selected from Soil Surveys in southern Brazil to identify and isolate the effects of organic and mineral components on depth distribution of exchangeable Al extracted with KCl (AlKCl). These soil profiles were divided into the following three groups based on AlKCl depth distribution: Group I – decrease with depth; Group II – little variation with depth; and Group III – increase with depth. High...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil Science; Agronomy Ki index; Organic matter; Smectite; Kaolinite; Al oxides; Lime requirement. Soil chemistry; Soil genesis  morphology and classification; Soil fertility.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39320

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

Determinação da densidade relativa do solo por uma função de pedotransferência para a densidade do solo máxima - doi: 10.4025/actasciagron.v33i2.6120
Provedor de dados: 1
Autores: Marcolin, Clóvis Dalri; Universidade do Oeste de Santa Catarina; Klein, Vilson Antonio; UPF.
O objetivo desse trabalho foi estimar a densidade relativa do solo (DR) a partir de uma função de pedotransferência para a densidade do solo máxima (Dsmáx). Amostras de dez solos, em sistema de plantio direto estabelecido há mais de dez anos, foram coletadas no Estado do Rio Grande do Sul, em camadas de 5 até 30 cm de profundidade, com a estrutura preservada e não-preservada. Determinaram-se a granulometria, os teores de matéria orgânica (MO), a densidade do solo (Ds) e a Ds do solo máxima (DsMax) pela metodologia do ensaio de Proctor. Com esses dados foi ajustada uma equação de regressão linear para se obter o valor da Dsmáx a partir dos teores de argila e MO no solo. Para os solos avaliados no Estado do Rio Grande do Sul a densidade do solo máxima pode...
Palavras-chave: Ciências Agrárias  Agronomia  Ciência do Solo  Física doSolo compactação do solo; Plantio direto; Textura; Matéria orgânica Física do Solo soil compaction; No-tillage; Texture; Organic matter.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6120

Depth distribution of exchangeable aluminum in acid soils: A study from subtropical Brazil
Provedor de dados: 1
Autores: Rabel, Diego Oliveira; Motta, Antonio Carlos Vargas; Barbosa, Julierme Zimmer; Melo, Vander Freitas; Prior, Stephen Arthur.
Due to potential crop toxicity, high aluminum (Al) availability requires increased attention when preparing agricultural soils. However, research examining the relationship between depth distribution of Al and soil weathering has received little priority in Brazil, particularly regarding the number of soil profiles investigated. This study analyzed 38 acid soils selected from Soil Surveys in southern Brazil to identify and isolate the effects of organic and mineral components on depth distribution of exchangeable Al extracted with KCl (AlKCl). These soil profiles were divided into the following three groups based on AlKCl depth distribution: Group I – decrease with depth; Group II – little variation with depth; and Group III – increase with depth. High...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ki index; Organic matter; Smectite; Kaolinite; Al oxides; Lime requirement.; Soil chemistry; Soil genesis; Morphology and classification; Soil fertility.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/39320

Use of Water Hyacinth (Eichhornia crassipes) to Treat Biogas Effluent of A Tapioca Industry Wastewater Treatment System
Provedor de dados: 111
Autores: Haryanto, Agus; Triyono, Sugeng; Siska, Posmaria Mei.
This research aims to evaluate performance of a water hyacinth (Eichornia crassipes (Mart) Solms) pond used to treat biogas effluent of a tapioca industry wastewater treatment system.  The water hyacinth pond which treats biogas effluent has been monitored for about two months.  Wastewater samples were taken from influent and effluent of the water hyacinth pond.  Parameters to be observed included wastewater quality parameters (pH, temperature, turbidity, BOD5, ammonia, solids, evapotranspiration, discharge, and hydraulic retention time) and water hyacinth parameters (growth, population density, moisture, ash, nutrient contents).  The results showed that water hyacinth improved some parameters of the biogas effluent to some extent.  Within HRT of 53 days,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wastewater; Biogas; Environmental burden; Organic matter; Indonesia.
Ano: 2020
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5867

Interaction effect between mineral zinc-nitrogen fertilization mixture and organic fertilization as compost on yield, nutrients uptake of rice and some soil properties
Provedor de dados: 111
Autores: Mosaad, Ibrahim S; Khafagy, El-Hosiny E; Seada, Ali K.
To study the effect of organic fertilization as compost (20 m3 fed-1), mineral Zinc-Nitrogen fertilization mixture (three Zinc levels (0, 8 and 16 kg Zn fed-1) and three nitrogen rates (0, 30 and 60 kg N fed-1 were mixed alternately) on growth, grain and straw yields, N, P and K uptake for rice crop (Oryza sativa), variety Giza 178, two field trials at El-Serw Agricultural Research Station, Damietta governorate were conducted through summer seasons of 2015 and 2016. Plant height, dry matter, grain and straw yields also, N, P and K-uptake in grain and straw yields increased with increasing levels of zinc and nitrogen fertilization. Moreover, use organic fertilization as compost gave the highest values of the previous parameters. Applying of 16 kg Zn fed-1 +...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rice; Zinc; Compost; Organic matter; Uptake; Nitrogen; Fertilization.
Ano: 2018
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4647

Relation between the sedimentary organic record and the climatic oscilations in the Holocene attested by palynofacies and organic geochemical analyses from a pond of altitude in southern Brazil
Provedor de dados: 42
Autores: GADENS-MARCON,GABRIELLI T.; MENDONÇA-FILHO,JOÃO G.; GUERRA-SOMMER,MARGOT; CARVALHO,MARCELO A.; PIRES,ETIENE F.; HARTMANN,LÉO A.
This paper presents the quantitative and qualitative results obtained from palynofacies and geochemistry analyses carried out on a core covering approximately 8000 years of sedimentation of a pond of altitude located at the mining district of Ametista do Sul, southernmost Brazil. The main objective of this paper is to consider the paleoclimatic and paleoenvironmental significance of these analyses. The hydrological isolation renders this pond climatically sensitive to variations in pluviometric regime and this enabled infer rainfall events during the early Holocene, which was responsible for the beginning of the processes of water accumulation in the gossan and the sedimentation of the pond. Changes in the pattern of moisture over the time become the drier...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continental environment; Pond; Organic matter; Palynofacies analysis; Total organic carbon; Total sulfur.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301077

Spatial distribution of organic matter in the surface sediments of Ubatuba Bay (Southeastern - Brazil)
Provedor de dados: 42
Autores: BURONE,LETICIA; MUNIZ,PABLO; PIRES-VANIN,ANA MARIA S.; RODRIGUES,MARCELO.
Analyses of organic matter content, organic carbon, nitrogen, sulfur and granulometric variables were performed on 101 surface sediment samples from Ubatuba Bay in order to investigate the spatial distribution of organic matter, its origin and the relationships among its components. The samples were obtained with a manual corer, from water depths between 1 and 15m during 5 cruises of the R/V "Veliger II'', two months apart. Pearson correlation, regression and Principal Component Analysis (PCA) statistical methods were used to analyze the data. Strong correlations between organic matter and fine sediment fractions were obtained. The PCA revealed at least two main sample groups that reflect the different environmental conditions prevalent in the bay. There...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Sediment; C/N ratio; Ubatuba; Brazil.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652003000100009

Spatial changes in the water quality of Itajaí-Açú Fluvial-Estuarine System, Santa Catarina, Brazil
Provedor de dados: 42
Autores: Pereira-Filho,Jurandir; Rörig,Leonardo R.; Schettini,Carlos A.F.; Soppa,Mariana A.; Santana,Bruno L.; Santos,José Eduardo dos.
This study was carried out with the aim of evaluating the spatial variation of the water quality in the Itajaí-Açú River estuary. Seven stations along the estuary were monitored on a weekly basis, from October 2003 to December 2004, plus two stations in tributaries (Itajaí-Mirim River, the main tributary, and one reference station). This monitoring included measurements of salinity, pH, dissolved oxygen, temperature, nutrients(NH+4,NO3-2,NO-3,PO3-4,H4SiO4) Biochemical Oxygen Demand (BOD), total phosphorous and dissolved organic phosphorus (TP and DOP), particulate organic carbon (POC), suspended particulate matter (SPM) and chlorophyll-a (Cla). Multivariate analyses demonstrated the compartmentalization of the system based on the deterioration in water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Itajaí Estuary; Nutrients; Organic matter; River; Santa Catarina.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000400019

Soil microbial C:N:P ratio across physiognomies of Brazilian Cerrado Soil microbial biomass across a gradient of preserved native Cerrado
Provedor de dados: 42
Autores: ROCHA,SANDRA M.B.; ANTUNES,JADSON E.L.; ARAUJO,FABIO F. DE; MENDES,LUCAS W.; SOUSA,RICARDO S. DE; ARAUJO,ADEMIR S. F. DE.
Abstract: Different physiognomies across the Cerrado could influence the microbial C:N:P ratio in the soil since these physiognomies present different abundance and diversity of plant species. Thus, the aim of this study was to evaluate the microbial C:N:P ratio in soil across three different physiognomies of Cerrado in the Northeast, Brazil, namely campo graminóide (dominance of grasses), cerrado stricto sensu (dominance of grasses, shrubs, low trees, and woody stratum), and cerradão (dominance of woody stratum). Campo graminóide was characterized by lower values of total organic C, N, microbial C:P, N:P, and soil C:N. Cerrado stricto sensu presented average values for most of the measured parameters, while cerradão presented higher values of microbial C,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial biomass; Soil quality; Organic matter; Tropical soil.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700857

Past and present land use influences on tropical riparian zones: an isotopic assessment with implications for riparian forest width determination
Provedor de dados: 49
Autores: Salemi,Luiz Felippe; Lins,Silvia Rafaela Machado; Ravagnani,Elizabethe de Campos; Magioli,Marcelo; Martinez,Melissa Gaste; Guerra,Fernando; Vidas,Natassia Bonini; Fransozi,Aline; Ferraz,Silvio Frosini de Barros; Martinelli,Luiz Antonio.
Abstract In this article, by using carbon stable isotopes, we assessed the past and present land use influences that riparian areas are subject within agricultural landscapes. Emphasis is given to the understanding of the effects of the 2012 Brazilian Forest Act on such areas. We selected five riparian areas within a highly C4 dominated agricultural landscape. Three of them had 30 meters native riparian forest buffer (NRFB) and two of them had 8 meter and no NRFB. We used three 100 meter-transects located 5, 15 and 30 meters relative to stream channel to obtain soil samples (0 - 10 cm). All riparian areas presented soil carbon isotopic signatures that are not C3 (native forests) irrespective of having or not 30 meters NRFB. Two cases presenting less than...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Watershed; Soil degradation; Organic matter; Sediment; Carbon cycling.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000200210

Models for the estimation of the physical quality of a Yellow Red Latosol (Oxisol) under pasture
Provedor de dados: 52
Autores: Ribon,Adriana Aparecida; Tavares Filho,João.
Models were developed considering the physical parameters penetration resistance (RP), bulk density (Ds), gravimetric moisture (U), clay content (Ag), sand content (Ar) and organic matter (MO) collected from a Yellow Red Latosol (Oxissol) medium texture under pasture from Rondonópolis county district, Mato Grosso State. Sampling was carried out in 34 fully randomized points in a 1 ha area to the depth of 0-20cm. The models were created using the Statistical Analysis System program (SAS) through which linear multiple regressions and correlations were made. Using the determination coefficient the following model was selected: RP=-12.134+0.004MO+7.6187Ds+0.131AG (R²=0.78). The evaluation of the organic matter and the soil clay content were important tools to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Modeling; Penetration resistance; Organic matter; Texture.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100004

Applicability of the use of waste from different banana cultivars for the cultivation of the oyster mushroom
Provedor de dados: 58
Autores: Carvalho,Cristiane Suely Melo de; Aguiar,Lorena Vieira Bentolila de; Sales-Campos,Ceci; Minhoni,Marli Teixeira de Almeida; Andrade,Meire Cristina Nogueira de.
The objective of this research was to evaluate the oyster mushroom Pleurotus ostreatus- (Jacq.: Fr.) Kumm. cultivation in substrates based on different combinations of wastes (leaf, pseudo-stem and pseudo-stem + leaf) and banana cultivars - Musa spp. (Thap Maeo, Prata Anã, Pelipita and Caipira) during 49 days. Organic matter loss in the substrate by action of the fungus was also evaluated during that period. It was verified that the pseudo-stem waste provided the best averages of biological efficiency among all cultivars tested and best rates were obtained by Thap Maeo (61.5%). The highest organic matter loss (OML) was obtained from pseudo-stem + leaf wastes (Prata Anã - 78.6%; Thap Maeo - 67.6%; Pelipita - 64.8%; Caipira - 60.6%). Therefore, the use of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pleurotus ostreatus; Mycelium; Organic matter; Biological efficiency; Supplementation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000200048

Integrated evaluation of soil quality after the incorporation of organic matter and microorganisms
Provedor de dados: 58
Autores: Valarini,Pedro J.; Alvarez,Mª Cruz Díaz; Gascó,José Mª; Guerrero,Francisca; Tokeshi,Hasime.
The soil quality was evaluated following the addition of organic matter and microorganisms to a clay loam soil collected in Aranjuez (Madrid) under controlled conditions of temperature and moisture, and over a period of three months. The following treatments were carried out: soil (control); soil + 50 t/ha of animal manure (E50); soil + 50 t/ha of animal manure + 30l/ha of effective microorganisms (E50EM); soil + 30 t/ha of combination of various green crop residues and weeds (RC30) and soil + 30 t/ha of combination of various green crop residues and weeds + 30l/ha of effective microorganisms (RC30EM). The soil samples were taken before and after the incubation and analysed using physical, chemical and microbiological parameters. A significant increase in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Methodology; Organic matter; Microorganisms; Physico-chemical; Microbiological soil properties.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000100007

Microbicide activity of clove essential oil (Eugenia caryophyllata)
Provedor de dados: 58
Autores: Nuñez,L.; D' Aquino,M.
Clove essential oil, used as an antiseptic in oral infections, inhibits Gram-negative and Gram-positive bacteria as well as yeast. The influence of clove essential oil concentration, temperature and organic matter, in the antimicrobial activity of clove essential oil, was studied in this paper, through the determination of bacterial death kinetics. Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa were the microorganisms selected for a biological test. To determine the temperature effect, they were assayed at 21° and 37° C. The concentration coefficient was determined with 0.4%, and 0.2% of essential oil. The influence of the presence of organic matter was determined with 0.4% of essential oil. The results obtained demonstrated that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clove essential oil; Concentration coefficient; Organic matter; Antibacterial activity.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400003

Effect of Irrigation Levels on Dissolved Organic Carbon Soil Distribution and the Depth Mobility of Chlorpyrifos
Provedor de dados: 117
Autores: Junod,Julio; Zagal,Erick; Sandoval,Marco; Barra,Ricardo; Vidal,Gladys; Villarroel,Mario.
Water flows provided by irrigation systems may be associated with dissolved organic carbon (DOC) content in the soil solution and may modify the mobility of pesticides, such as chlorpyrifos (CHP). These compounds were analyzed under field conditions, evaluating their distribution in the soil profile under excessive irrigation in a Humic Haploxerand soil. The trial was carried out in soil columns located under the canopy of apple trees (Malus domestica Borkh.) in an orchard located in the Bío-Bío Region, Chile. The insecticide CHP was applied 120 g hL-1, and later the natural run off was collected from the foliage to the columns. Surface irrigation was used as a control, the equivalent to 4 L h-1 weekly, plus two treatments over the columns of 6 and 8 L h-1...
Tipo: Journal article
Palavras-chave: Pesticides; Organic matter; Volcanic soil.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300017

Dissolved Organic Carbon and Nitrogen in Andisol for Six Crop Rotations with Different Soil Management Intensity
Provedor de dados: 117
Autores: Undurraga D,Pablo; Zagal V,Erick; Sepúlveda W,Gloria; Valderrama V,Natalia.
Soil organic matter (OM) content is a quality indicator, but is an inadequate indicator in the short-term because these changes take place slowly, so dissolved organic components have emerged as an alternative. In volcanic soil subjected to different crop rotations with distinct land use intensity, dissolved organic C and N (DOC and DON) were determined as well as their relationship with total C and N contents in the soil, considering the effects of crop rotation, fertilization level, and soil depth. In humid samples of Humic Haploxerands collected at four depths up to 40 cm, DOC and DON contents were determined by extraction with K2SO4 and filtered. Results indicated interaction between the studied factors, DOC fluctuated between 67.8 and 151.7 mg kg-1...
Tipo: Journal article
Palavras-chave: Organic matter; Dissolved organic matter; Total C; Total N; Volcanic soil.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300018

Effect of organic and mineral amendments upon soil respiration and microbial biomass in a saline-sodic soil
Provedor de dados: 118
Autores: Celis,José E; Sandoval,Marco; Martínez,Bárbara; Quezada,Celerino.
J.E. Celis, M. Sandoval, B. Martínez, and C. Quezada. 2013. Effect of organic and mineral amendments upon soil respiration and microbial biomass in a saline-sodic soil. Cien. Inv. Agr. 40(3): 571-580. An understanding of soil carbon stocks and fluxes in saline-sodic soils is becoming critical in environmental management because salinity and sodicity are predicted to increase worldwide. The effects of amendment with sewage sludge (SW), mined gypsum (MG) and synthetic gypsum (SG) on the soil respiration rate and soil (S) microbial biomass (SMB) of a saline-sodic soil were assessed in vitro over 60 days under controlled conditions. The treatments were: T1 = S + MG (7 t ha-1); T2 = S + MG (7 t ha-1) + SW (90 t ha-1); T3 = S + SG (7 t ha-1); T4 = S + SG (7 t...
Tipo: Journal article
Palavras-chave: Arid soil; Biological activity; Gypsum; Organic matter; Sewage sludge; Soil respiration.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000300010

Oxidizable fractions of soil organic carbon in Caatinga forest submitted to different forest managements
Provedor de dados: 65
Autores: Batista,Suellen Gomes Monteiro; Barreto-Garcia,Patrícia Anjos Bittencourt; Paula,Alessandro de; Miguel,Divino Levi; Batista,Willyan Charles Amaral.
ABSTRACT:  One of the main alternatives for the rational exploitation of the Caatinga biome’s natural resources is sustainable forest management. Soil organic carbon (SOC) and its fractions can be used to evaluate the conservation status of forest ecosystems after anthropic interventions. Therefore, the objective of this study was to evaluate the short-term effect of different forest management practices on the distribution of SOC fractions in the Caatinga area located in Contendas do Sincorá National Forest (BA). Three forest management practices (clear cutting, selective cutting by diameter and selective cutting by species) were evaluated, using the unmanaged Caatinga as a control. Soil samples were collected at the 0-10cm depth. The SOC was fractionated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Chemical fractionation; Labile carbon.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001000300

Hydro-physical processes and soil properties correlated with origin of soil hydrophobicity
Provedor de dados: 65
Autores: Vogelmann,Eduardo Saldanha; Reichert,José Miguel; Prevedello,Juliana; Awe,Gabriel Oladele.
Hydrophobicity is the phenomenon where the soil has reduced wettability, usually associated with coating of soil particles by hydrophobic organic substances. This study aimed to provide a description of the hydrophobicity occurrence, highlight recent discoveries about the origin of phenomenon and discuss the main hydro-physical properties and chemical processes linked to the development of hydrophobic behavior in soils. Hydrophobicity is associated with other factors such as soil moisture, presence of some fungi species, particle size, soil pH and occurrence of burnings. The causative substances may be provided by local vegetation, through deposition or decomposition. The dependence and combination of different factors that influence hydrophobicity in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydrophobic; Hydrophilic; Organic matter; Water repellency; Soil moisture.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000900008

Winter cover crops affecting physical and chemical soil attributes in a commercial vineyard
Provedor de dados: 65
Autores: Veiga,Milton da; Feldberg,Nelson Pires; Nava,Gilberto; Bettoni,Jean Carlos.
ABSTRACT: Cover crops may have direct or indirect effects on the physical and chemicalsoil attributes; these cropsplay a key role in the cycling of nutrients in the soil and add labile organic carbon, bringing economic and environmental benefits to the system. To study the effect of cover crops on the physical and chemical properties of an Oxisol, a three-year experiment was conducted in a commercial vineyard located at Epagri’s Experimental Station in Videira, SC, Brazil. Different winter species (white clover, red clover, common vetch, turnip, corn spurrey, black oat, rye, and ryegrass) were sown in addition to treatments with manual weeding or mechanical mowing. Certain chemical and physical attributes of soil were determined in samples collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic matter; Nutrients; Bulk density; Soil porosity; Vitis spp.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017001200252