Consulta: subjectFacets:"Organic carbon"
Registros recuperados: 44
Data/hora: 19/05/2024 00:36:46

Aggregation, carbon, and total soil nitrogen in crop-livestock-forest integration in the Eastern Amazon
Provedor de dados: 91
Autores: Silva,Jéssica C. N.; Silva,Arystides R.; Veloso,Carlos A. C.; Dantas,Edilândia F.; Sacramento,José A. A. S. do.
ABSTRACT Sustainable agricultural production systems can improve physical attributes of soil as well as increase carbon and nitrogen stocks in soils. The objective of this study was to evaluate changes in the stability of soil aggregates and contents and stocks of carbon and nitrogen after the conversion of native forest to crop-livestock-forest integration systems in the region of Western Pará. Soil samples from five management systems (including a control) were collected at three depths in a randomized block design, with five replications. The stability of the aggregates, soil density, particle density, and total soil porosity, as well as total carbon and nitrogen and their respective stocks were evaluated. The native forest had the highest percentages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Soil physics; Sustainability; Brazilian Amazon.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200837

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

Aluminum hydroxy-interlayered minerals and chemical properties of a subtropical Brazilian Oxisol under no-tillage and conventional tillage
Provedor de dados: 90
Autores: Inda,Alberto Vasconcellos; Torrent,José; Barrón,Vidal; Bayer,Cimélio.
No tillage systems significantly influence the soil system, but knowledge about the effects on the mineralogy of tropical and subtropical soils is limited. This study evaluated the long-term effects (26 years) of no-tillage (NT) on aluminum hydroxy-interlayered minerals of a subtropical Oxisol in Southern Brazil (Guarapuava, PR), compared to the same soil under conventional tillage (CT). The clay fraction (&lt; 2 µm) in soil samples of the surface horizons of a field experiment under both management systems was analyzed by X-ray diffraction (XRD) to identify and characterize Al hydroxy-interlayered minerals before and after treatment with sodium citrate to remove intra-layer material. Soil liquid (solution) and solid phases were also characterized. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HIS; HIV; Organic carbon; Soil management systems; Mineral stability.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000100004

An iron budget during the natural iron fertilisation experiment KEOPS (Kerguelen Islands, Southern Ocean)
Provedor de dados: 5
Autores: Chever, F.; Sarthou, G.; Bucciarelli, E.; Blain, S.; Bowie, A. R.
Total dissolvable iron (TDFe) was measured in the water column above and in the surrounding of the Kerguelen Plateau (Indian sector of the Southern Ocean) during the KErguelen Ocean Plateau compared Study (KEOPS) cruise. TDFe concentrations ranged from 0.90 to 65.6 nmol L-1 above the plateau and from 0.34 to 2.23 nmol L-1 offshore of the plateau. Station C1 located south of the plateau, near Heard Island, exhibited very high values (329-770 nmol L-1). Apparent particulate iron (Fe-app), calculated as the difference between the TDFe and the dissolved iron measured on board (DFe) represented 95 +/- 5% of the TDFe above the plateau, suggesting that particles and refractory colloids largely dominated the iron pool. This paper presents a budget of DFe and...
Tipo: Text
Palavras-chave: Phytoplankton bloom; Dissolved iron; Atlantic ocean; Central california; Carbon sequestration; Coastal waters; Surface waters; Plateau region; Organic carbon; Bound iron.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00205/31605/30036.pdf

Benefits of liquid urea and a microbial catalyst on biomass and the nutritional value of Mombasa grass
Provedor de dados: 109
Autores: Alquichire Rojas,Shirley Lorena; Valencia-Chin,Elide.
Abstract During 2019, an experiment was conducted at the Agricultural Experiment Station in Isabela (Puerto Rico) on an Oxisol with previously well-stablished stands of cv. Mombasa. This experiment assessed the effects of a microbial catalyst (MC) and liquid urea 22-0-0 (LU) at a rate of 168 kg ha-1 (in split applications), a mixture of LU+MC and a control on aboveground biomass, root biomass, nutritional value, nitrogen use efficiency and soil parameters on cv. Mombasa at 35-day (d) harvests during six harvests. The study was established in a completely randomized design with four replicates. The effects of LU and MC on belowground (root) biomass were determined by collecting samples in 1 m2 to determine the yield and chemical composition. Soil samples...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biofertilizer; Bromatological variables; Nitrogen fertilizer; Organic carbon; Tropical forage.
Ano: 2022
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000100064

Biological Properties and Organic Matter Dynamics of Soil in Pasture and Natural Regeneration Areas in the Atlantic Forest Biome
Provedor de dados: 90
Autores: Nogueira,Leandro Ribeiro; Silva,Cristiane Figueira da; Pereira,Marcos Gervasio; Gaia-Gomes,João Henrique; Silva,Eliane Maria Ribeiro da.
ABSTRACT The removal of original vegetation for crops and pasture production and then followed by natural regeneration is a standard practice in the Atlantic Forest, which has produced patches with different degrees of degradation and regeneration across the landscape. The aim of this study was to evaluate the effects of replacement of native forest by pasture and natural regeneration of vegetation on soil and on soil organic matter (SOM) dynamics in the dry and rainy season in an Atlantic Forest fragment in Passa Vinte, Minas Gerais (MG), Brazil. Soil samples were collected in the rainy and dry season, at a depth of 0.00-0.05 m. The variables determined were total organic carbon (TOC) and particle-size fractions of SOM [particulate organic carbon (POC)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Microbial biomass; Arbuscular mycorrhizal fungi; Biodiversity; Forest fragment.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100420

Biotracers and geotracers of depositional events in NW Mediterranean margin over the past two centuries
Provedor de dados: 5
Autores: Giresse, P; Buscail, R; Charriere, B; Abassi, A; Masque, P; Sanchez-cabeza, Ja.
A detailed sedimentological and geochemical investigation was performed on slope sediments collected from the Gulf of Lions and Catalonian margins and from the northern Balearic margin. The study was based on cores, about 50 cm long. Various physiographic sites (canyons, open slopes) were selected according to the available sediment accumulation rates obtained with the Pb-210 geochronological method. At a short time scale, various parts of the slope were characterized by muddy hemipelagic sediment. Sedimentological data suggested that deposition was continuous. Total organic carbon and its hydrolysable fraction decreased downcore. Significant increase of C/N ratio downcore resulted from an early diagenetic process in response to the burial effect. However...
Tipo: Text
Palavras-chave: Méditerranée nord-occidentale; Vitesse de sédimentation; Processus gravitaires; Carbone organique; 210Pb; North-western Mediterranean; Sedimentation rate; Gravity-induced process; Organic carbon; Pb-210.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43335/42892.pdf

Caracterización química de los sedimentos superficiales de las bahías de Cárdenas y Santa Clara, Archipiélago Sabana-Camagüey, Cuba.
Provedor de dados: 20
Autores: Montalvo, J. F.
Los sedimentos superficiales de las bahías de Cárdenas y Santa Clara fueron muestreados en mayo de 2002 y julio de 2005, evaluándose los parámetros orgánicos e inorgánicos que tienen mayor peso en los ciclos biogeoquímicos (carbón, nitrógeno, fósforo, carbonatos, sulfuro de hidrógeno y consumo de oxidante químico). Los sedimentos de las bahías de Cárdenas y Santa Clara, poseen notables contenidos de carbón orgánico y concentraciones de nitrógeno inferiores a 0,2 %, evidenciando que la fuente principal de materia orgánica en estos cuerpos de agua es la vegetación periférica y acuática, rica en carbono y pobre en nitrógeno. En estas bahías las concentraciones promedio de carbonatos son superiores al 35 %, aunque la mayor riqueza corresponde a la bahía de...
Tipo: Journal Contribution
Palavras-chave: Sediments; Organic carbon; Nitrogen; Hydrogen sulphide; Bays; Nitrogen; Hydrogen sulphide; Http://aims.fao.org/aos/agrovoc/c_5192; Http://aims.fao.org/aos/agrovoc/c_15986.
Ano: 2006
URL: http://hdl.handle.net/1834/3342

Carbono no Semiárido brasileiro.
Provedor de dados: 14
Autores: GIONGO, V.
Semiárido e Bioma Caatinga; Sistema solo: áreas do cristalino, áreas do cristalino recobertas por materiais mais ou menos arenosos, áreas sedimentares; Sistema planta: savana florestada, savana arborizada, savana parque, savana gramíneo-lenhosa; Uso da terra e balanço de carbono.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Mudanças climáticas; Bioma Caatinga; Balanço de carbono; Organic carbon; Recurso natural; Solo; Carbono; Caatinga; Clima; Vegetação nativa; Ecossistema; Uso da Terra; Soil; Microbiology; Farming systems.
Ano: 2014
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1008264

Changes in soil chemical and physical properties in pasture fertilised with liquid swine manure
Provedor de dados: 63
Autores: Scheid,Douglas Leandro; Silva,Rodrigo Ferreira da; Silva,Vanderlei Rodrigues da; Ros,Clovis Orlando Da; Pinto,Marlo Adriano Bison; Gabriel,Márcia; Cherubin,Maurício Roberto.
ABSTRACT: Chemical and physical properties of soil can be altered with the successive application of liquid swine manure (LSM), also known as slurry. Therefore, monitoring the impact of LSM is essential to an assessment of the potential agronomic and environmental benefits and risks associated with management practices. The aim of this study was to evaluate the effects of LSM on the chemical and physical attributes of soil under pasture (Cynodon spp.), located in southern Brazil. Four areas were sampled: three areas cultivated with Cynodon spp. pasture with successive applications of 200 m3 ha–1 y–1 of LSM for three, eight and 15 years; and untreated native forest as a reference. The soil attributes evaluated were: organic carbon (OC), active (pH water)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Management of organic residues; Organic carbon; Nutrient availability; Soil compaction; Soil chemistry.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000501401

Characteristic of Dystrustepts in the Venezuelan Andes
Provedor de dados: 90
Autores: Ochoa,Guido; Oballos,Jajaira; Velásquez,Juan Carlos; López,Isabel; Manrique,Jorge.
The majority (60 %) of the soils in the Venezuelan Andes are Inceptisols, a large percentage of which are classified as Dystrustepts by the US Soil Taxonomy, Second Edition of 1999. Some of these soils were classified as Humitropepts (high organic - C-OC-soils) and Dystropepts by the Soil Taxonomy prior to 1999, but no equivalent large group was created for high-OC soils in the new Ustepts suborder. Dystrusepts developed on different materials, relief and vegetation. Their properties are closely related with the parent material. Soils developed on transported deposits or sediments have darker and thicker A horizons, a slightly acid reaction, greater CEC and OC contents than upland slope soils. Based on the previous classification into large groups...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Classification; Inceptisols; Organic carbon.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600026

Compressibility and water availability in Albaqualf soils under different deployment times in no-tillage
Provedor de dados: 63
Autores: Reis,Diony Alves; Lima,Cláudia Liane Rodrigues de; Bamberg,Adilson Luís; Ribeiro,Pablo Lacerda.
ABSTRACT: The southern Brazilian lowlands have been historically used for flooded rice cultivation. Over time, heavy machinery and intensive tillage practices have resulted in soil structure disruption, soil compaction, higher production costs and lower agricultural profitability. This study aimed to evaluate the effect of different deployment times of no-tillage (NT). Soil properties including bulk density (BD), compression index (CI), preconsolidation pressure (σp), bulk density at preconsolidation pressure (BDσp), degree of compactness (DC), soil water retention curve (SWRC), plant available water (PAW) and total organic carbon (TOC) content were evaluated using a 30-yr non-cultivated field (NC), adjacent to the experimental plots as a control. The BD,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lowlands; Preconsolidation pressure; Degree of compactness; Organic carbon.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000500393

Cover plants and mineral nitrogen: effects on organic matter fractions in an oxisol under no-tillage in the cerrado
Provedor de dados: 90
Autores: Santos,Isis Lima dos; Caixeta,Carla Ferreira; Sousa,Alex Antônio Torres Cortês de; Figueiredo,Cícero Célio de; Ramos,Maria Lucrécia Gerosa; Carvalho,Arminda Moreira de.
Cover plants are essential for the sustainability of no-tillage systems in tropical regions. However, information on the effects of these plants and N fertilization on soil organic matter fractions is still scarce. This study evaluated the effect of cover crops with different chemical composition and of N topdressing on the labile and humified organic matter fractions of an Oxisol of the Cerrado (savanna-like vegetation). The study in a randomized complete block design was arranged in split-plots with three replications. Four cover species were tested in the plots and the presence or absence of N topdressing in the subplot. The following cover species were planted in succession to corn for eight years: Urochloa ruziziensis; Canavalia brasiliensis M. ex...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Organic carbon; Humic substances; Particulate organic carbon.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600022

Effect of management systems and cover crops on organic matter dynamics of soil under vegetables
Provedor de dados: 90
Autores: Souza,Rodrigo Fernandes de; Figueiredo,Cícero Célio de; Madeira,Nuno Rodrigo; Alcântara,Flávia Aparecida de.
Vegetable production in conservation tillage has increased in Brazil, with positive effects on the soil quality. Since management systems alter the quantity and quality of organic matter, this study evaluated the influence of different management systems and cover crops on the organic matter dynamics of a dystrophic Red Latosol under vegetables. The treatments consisted of the combination of three soil tillage systems: no-tillage (NT), reduced tillage (RT) and conventional tillage (CT) and of two cover crops: maize monoculture and maize-mucuna intercrop. Vegetables were grown in the winter and the cover crops in the summer for straw production. The experiment was arranged in a randomized block design with four replications. Soil samples were collected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Oxidizable fractions; Microbial biomass; Humic fractions.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300024

Effect of Organic Matter on Manganese Solubility
Provedor de dados: 52
Autores: Andrade,Emilene; Miyazawa,Mário; Pavan,Marcos A.; Oliveira,Edson L. de.
The objective of this study was to re-evaluate some aspects of the relative importance of organic matter on Mn solubility in acid soil conditions. Field study showed that black oats, oil seed radish, elephant grass, lupin, leucaena, and coffee leaves serving as mulch decreased Mn solubility as compared with bare soil. The decrease in Mn solubility with plant mulch was related to increase in soil moisture content. Laboratory study showed that increasing temperature from 25 to 100ºC increased Mn solubility and total soil organic carbon was little changed; from 150 to 200ºC increased both Mn solubility and organic carbon oxidation, and up to 300ºC decreased Mn solubility and stoped organic carbon oxidation . Aluminum solubility always increased with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Plant residue; Mulch; Organic carbon; Heavy metal; Micronutrient.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000100003

Effect of Organic Matter on the Behavior and Control Effectiveness of Herbicides in Soil
Provedor de dados: 87
Autores: TAKESHITA,V.; MENDES,K.F.; ALONSO,F.G.; TORNISIELO,V.L.
ABSTRACT: With extensive use of herbicides in agricultural areas, the risk of contamination of groundwater and surface water by these products has become a worldwide concern. Practices of application or maintenance of soil organic residues that have begun to be used in agriculture for soil nutrition have demonstrated other benefits besides nutrient supplementation, such as reduced mobility and increased soil degradation of herbicides. Because it is the final destination of herbicides, soil and its constituents, especially organic matter in tropical soils, play a prominent role in processes that encompass the dynamics of herbicide molecules. In this context, it is necessary to know the influence of the organic matter and its constituents on the behavior of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sorption; Mobility; Biodegradation; Organic carbon.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100304

Effects of burning and weed control on vegetation cover and soil organic matter compartments in the Brazilian Amazon
Provedor de dados: 109
Autores: Marinho Lisboa,Fabrício.
Abstract The aim of this study was to evaluate the effects of burning and manual control of invasive species on a Latossolo Vermelho-Amarelo soil covered with Urochloa brizantha. Five soil samples were collected for pasture and forest, at 0-5 cm depth, to determine the accumulated respiration, microbial biomass carbon (MBC), mild organic matter, total organic carbon (TOC), water soluble carbon and MBC:TOC ratio. Three groups according soil grass coverage were selected: (1) group I with 33.5% of bare soil, (2) group 2 with 90% coverage and (3) group 3 with 53.4% coverage of invasive species. The highest value of TOC was found in forest (36.52 g/kg). The highest accumulative value of respiration in the soil was observed in group 3 (2.6 mg/kg) and the highest...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bare soil; Organic carbon; Urochloa brizantha; Weed.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000300389

Evaluation of the heterotrophic activity in waters by microanalytical methods.
Provedor de dados: 5
Autores: Bertoni, R.
The radiochemical methods proposed for evaluating heterotrophic activity in waters have been severely criticized in recent years because they are not considered to be sufficiently realistic. Thus, the possibility of directly measuring the heterotrophic consumption of naturally occurring Organic Carbon (OC) in fresh water samples incubated under controlled conditions has been evaluated. The analytical performances of two OC analyzers utilizable for this purpose are discussed here, and some examples of the results obtained by the direct measurement of OC consumption are presented. The consumption rates thus measured ranged from 11.6 to 50.2 mu gC/ 1.h. Although the technique discussed here is less sensitive than radiochemical methods, the few assumptions...
Tipo: Text
Palavras-chave: Biogeochemistry; Microbiology; Carbon cycle; Organic carbon; Water; Heterotrophic organisms; Analytical techniques.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-950.pdf

Flujos de materiales conservativos y no conservativos en la Bahía de Jigüey
Provedor de dados: 20
Autores: Montalvo, J. F.; Loza, S.
Se construyeron y modelaron los resupuestos y procesos biogeoquímicos de carbón, nitrógeno y fósforo para tres muestreos (Julio/2004, Abril y Diciembre/2005) en un cuerpo de agua de semi-cerrado e hipersalino como la Bahía de Jigüey. Se colectaron muestras de agua para medir los parámetros hidroquímico s relacionados con el sistema, nutrientes inorgánicos (nitratos + nitrito, amonio y fósforo), la demanda química de oxígeno, nitrógeno total y fósforo total. En la etapa de la investigación la salinidad varió entre 50 y 95 ups y se calcularon los presupuestos de carbón y nutrientes por muestreo. El flujo de fósforo inorgánico (ΔIP) en la bahía está alrededor de -2,06 mmol m-2 d-1, y equivale a una producción promedio de carbón orgánico por vía fotosintética...
Tipo: Journal Contribution
Palavras-chave: Nutrients (mineral); Organic carbon.
Ano: 2006
URL: http://hdl.handle.net/1834/3336

Gravimetric determination of soil organic matter
Provedor de dados: 52
Autores: Miyazawa,M.; Pavan,M.A.; Oliveira,E.L. de; Ionashiro,M.; Silva,A.K.
Studies were carried out to evaluate a gravimetric method for the determination of soil organic matter by the mass loss at 300ºC. The gravimetric method was compared with Walkley-Black, using several brazilian soils with variable chemical and physical properties. Gravimetric method was positively correlated with Walkley-Black method with the following linear regression equation: y = 3.72x + 0.29, r = 0.94. The angular coefficient 3.72 for tropical soils was greater than those reported in the literature for temperate soils (from 1.68 to 2.13). The difference was due to greater oxidation degree of the organic matter. When compared with Walkley-Black method, gravimetric technique showed certain distinct advantages such as no environmental contamination with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Thermogravimetry; Soil analysis.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132000000500005

Growth of silver catfish ( Rhamdia quelen ) exposed to acidic pH at different humic acid levels
Provedor de dados: 65
Autores: Costa,Silvio Teixeira da; Sutili,Fernando Jonas; Gressler,Luciane Tourem; Loebens,Luíza; Colpo,Carine Vargas; Lazzari,Rafael; Baldisserotto,Bernardo.
ABSTRACT: Humic substances are organic compounds that possess high molecular weight and are formed by the decomposition of plant materials. Humic substances comprise humic acids, fulvic acids and humin. Humic acids (HA) have shown to be able to provide some protection to biological membranes of fish in water with low pH, replacing the protective action of Ca2+. Thus, this studyaimed to observe growth of silver catfish ( Rhamdia quelen ) juveniles exposed to pHs 5.5 and 6.5 and to different levels of HA: 0, 10, 25 and 50mg L-1. Results showed that, irrespective of pH, HA was highly detrimental to silver catfish growth, since the higher the concentration of HA, the lower the weight gain and feed intake, resulting in lower biomass and lower specific growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Humic substance; Water pH; Fish growth; Organic carbon.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000601094

Iron oxides and organic matter on soil phosphorus availability
Provedor de dados: 64
Autores: Fink,Jessé Rodrigo; Inda,Alberto Vasconcellos; Tiecher,Tales; Barrón,Vidal.
ABSTRACT Continuous crop expansion has led to a growing demand for phosphate fertilizers. A sound knowledge of the dynamics of phosphorus, and its interaction with iron oxides and organic matter, can be useful to develop effective strategies for sustainable management, especially in a scenario of increasing shortage of mineral phosphate resources. In this paper, we review the relationship of phosphate to iron oxides and organic matter, and its effect on phosphorus availability. Crops typically obtain phosphate from weathered minerals and dissolved fertilizers. However, the amount of phosphorus present in the soil solution depends on the extent to which it is adsorbed or desorbed by iron oxides, which may be influenced by interactions with organic matter....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Goethite; Hematite; Phosphorus adsorption; Phosphorus desorption; Organic carbon.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542016000400369

Latitudinal patterns of export production recorded in surface sediments of the Chilean Patagonian fjords (41-55 degrees S) as a response to water column productivity
Provedor de dados: 5
Autores: Aracena, Claudia; Lange, Carina B.; Iriarte, Jose Luis; Rebolledo, Lorena; Pantoja, Silvio.
The Chilean Patagonian fjords region (41-56 degrees S) is characterized by highly complex geomorphology and hydrographic conditions, and strong seasonal and latitudinal patterns in precipitation, freshwater discharge, glacier coverage, and light regime; all of these directly affect biological production in the water column. In this study, we compiled published and new information on water column properties (primary production, nutrients) and surface sediment characteristics (biogenic opal, organic carbon, molar C/N, bulk sedimentary delta(13)C(org)) from the Chilean Patagonian fjords between 41 degrees S and 55 degrees S, describing herein the latitudinal pattern of water column productivity and its imprint in the underlying sediments. Based on information...
Tipo: Text
Palavras-chave: Biogenic opal; Organic carbon; Stable carbon isotopes; Primary production; Fjords; Patagonia.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00214/32519/30998.pdf

Least limiting water range and physical quality of soil under groundcover management systems in citrus
Provedor de dados: 63
Autores: Fidalski,Jonez; Tormena,Cássio Antonio; Silva,Álvaro Pires da.
Machinery-based farming operations used for perennial fruit crops often damage soils, particularly if the soil is wet and prone to compaction. We hypothesized that perennial vegetation growing in the interrows of orange orchards can mitigate the soil physical degradation from machinery traffic. The objective of this study was to investigate the effects of different groundcover management systems on the soil physical quality indicators including the least limiting water range (LLWR). An experiment was started in 1993 in a Typic Paleudult to evaluate three groundcover management systems: Bahia grass (Paspalum notatum) with mowing, perennial peanut (Arachis pintoi), and natural regrowth in which weeds were controlled by herbicide. The experimental design was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Soil compaction; Bulk density; Resistance to penetration; Available water.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400012

Mercury and organic carbon distribution in six lakes from the North of Rio de Janeiro State
Provedor de dados: 52
Autores: Sousa,Wanderson Primo de; Carvalho,Carlos Eduardo Veiga de; Carvalho,Claudia Calasans Veiga de; Suzuki,Marina Satika.
The objectives of the study was to evaluate the mercury contamination in sediments of six lagoons located in the north region of Rio de Janeiro State, trying to relate the Hg concentrations with factors that could influence it's mobility, such as organic carbon. The highest values observed in the superficial sediments in lakes like Campelo (349,6 µg.kg -1) suggested a recent Hg input into the system. The correlation Hg/Organic carbon was positive for most areas, indicating that the organic carbon was a significant parameter for Hg retention in this region. The obtained results suggested that the mercury used as fungicide in agriculture lands and in gold mining areas in the past were probably responsible for the contamination of this environment.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mercury; Organic carbon; Sediment; Lakes.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100019

Microflores sulfatoreductrices en milieu subantarctique. Relations avec quelques parametres physicochimiques et biologiques. (Microflores totales et heterotrophes)
Provedor de dados: 5
Autores: Delille, D; Bouvy, M.
The archipelago of Kerguelen with its complex fjord distribution is particularly interesting for the study of anoxic systems. Between 1968 and 1972, several stations were investigated fortnightly. One of these was further sampled weekly throughout 1982. Each sample series of sediment included the superficial aerobic and subsuperficial anaerobic levels. Each level was examined for direct epifluorescent counts, heterotrophic and sulfate-reducing bacterial numbers by M.P.N. methods, organic carbon and sulfide measurements. Sulfate-reducing bacteria seemed less related to total biomass than the heterotrophic microflora, the latter being dependent on organic supplies. The hydrogen sulfide production was directly related to the presence of sulfate reducers;...
Tipo: Text
Palavras-chave: Anoxic conditions; Bacteria; Heterotrophic organisms; Sulphur; Organic carbon; Physicochemical properties; Seasonal variations; Population number; Microorganisms; Polar waters; Sulfate reduction.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-970.pdf

Mineralizing Filamentous Bacteria from the Prony Bay Hydrothermal Field Give New Insights into the Functioning of Serpentinization-Based Subseafloor Ecosystems
Provedor de dados: 5
Autores: Pisapia, Celine; Gerard, Emmanuelle; Gerard, Martine; Lecourt, Lena; Lang, Susan Q.; Pelletier, Bernard; Payri, Claude E.; Monnin, Christophe; Guentas, Linda; Postec, Anne; Quemeneur, Marianne; Erauso, Gael; Menez, Benedicte.
Despite their potential importance as analogs of primitive microbial metabolisms, the knowledge of the structure and functioning of the deep ecosystems associated with serpentinizing environments is hampered by the lack of accessibility to relevant systems. These hyperalkaline environments are depleted in dissolved inorganic carbon (DIC), making the carbon sources and assimilation pathways in the associated ecosystems highly enigmatic. The Prony Bay Hydrothermal Field (PHF) is an active serpentinization site where, similar to Lost City (Mid-Atlantic Ridge), high-pH fluids rich in H-2 and CH4 are discharged from carbonate chimneys at the seafloor, but in a shallower lagoonal environment. This study aimed to characterize the subsurface microbial ecology of...
Tipo: Text
Palavras-chave: Serpentinization; Alkaline hydrothermalism; Deep life; Firmicutes; Acetothermia; Omnitrophica; Organic carbon.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00467/57909/60314.pdf

Mineralogy and phosphorus adsorption in soils of south and central-west Brazil under conventional and no-tillage systems
Provedor de dados: 1
Autores: Fink, Jessé Rodrigo; Universidade Federal do Rio Grande do Sul; Inda, Alberto Vasconcellos; Universidade Federal do Rio Grande do Sul; Bayer, Cimélio; Universidade Federal do Rio Grande do Sul; Torrent, José; Universidade de Córdoba; Barrón, Vidal; Universidade de Córdoba.
The low phosphorus availability in tropical and subtropical soils, normally related to adsorption of phosphate to the minerals surfaces, can be attenuated when organic matter (OM) accumulates in the soils. Herein, we report the results of long-term experiments (18–32 years) aimed at quantifying the maximum phosphorus adsorption capacity (MPAC) and its determinant mineralogical variables in Brazilian soils and at assessing the effect of no-tillage (NT) in mitigating the phosphorus adsorption of soils. The MPAC of soils ranged from 297 to 4,561 mg kg-1 in the 0.00–0.10 m layer and from 285 to 4,961 mg kg-1 in the 0.10–0.20 m layer. The MPAC was correlated with the concentrations of iron oxides, goethite and ferrihydrite, gibbsite/(gibbsite+kaolinite) ratio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: 5.01.01.00-5; 5.01.01.05-6; 5.01.01.01-3 iron oxides; Gibbsite; Organic carbon; Phosphate Fertilidade do solo; Gênese do solo; Manejo do solo.
Ano: 2014
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17937

Organic carbon and oil hydrocarbons in bottom sediments of  Sevastopol Bay (the Black Sea)
Provedor de dados: 13
Autores: Osadchaya, T. S.; Ovsyaniy, E. I.; Romanov, A. S.; Ignatieva, O. G.
The paper summarizes data available from the literature and recently obtained about interannual variations of the content of organic carbon, chloroform bitumenoids and oil hydrocarbons found in bottom sediments of Sevastopol Bay (Black Sea). For the recent years the bottom sediment has been receiving a rich inflow of organic matter. Localities where organic carbon content is especially high appeared owing to special sedimentation conditions and unevenly distributed anthropogenic load on the bay's water area. As the result, such sediments have reductive properties which foster accumulation of bitumenoids and oil hydrocarbons.
Tipo: Journal Contribution
Palavras-chave: The Black Sea; Bottom sediment; Organic carbon; Bitumenoid; Oil hydrocarbon; Pollution; Черное море; Донные осадки; Органический углерод; Битумоиды; Нефтяные углеводороды; Загрязнение Organic carbon Pollution Pollution http://aims.fao.org/aos/agrovoc/c_6077.
Ano: 2003
URL: http://repository.ibss.org.ua/dspace/handle/99011/41

ORGANIC MATTER FRACTIONS IN A QUARTZIPSAMMENT UNDER CULTIVATION OF IRRIGATED MANGO IN THE LOWER SÃO FRANCISCO VALLEY REGION, BRAZIL
Provedor de dados: 90
Autores: Cardoso,José Alberto Ferreira; Lima,Augusto Miguel Nascimento; Cunha,Tony Jarbas Ferreira; Rodrigues,Marcos Sales; Hernani,Luis Carlos; Amaral,Andre Julio do; Oliveira Neto,Manoel Batista de.
Improper land use has lead to deterioration and depletion of natural resources, as well as a significant decline in agricultural production, due to decreased soil quality. Removal of native vegetation to make way for agricultural crops, often managed inadequately, results in soil disruption, decreased nutrient availability, and decomposition of soil organic matter, making sustainable agricultural production unviable. Thus, the aim of the present study was to evaluate the impact of growing irrigated mango (over a 20 year period) on the organic carbon (OC) stocks and on the fractions of soil organic matter (SOM) in relation to the native caatinga (xeric shrubland) vegetation in the Lower São Francisco Valley region, Brazil. The study was carried out on the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Organic carbon; Humic substances; Heavy fraction; Semiarid region.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401068

Organic matter in sediments in the mangrove areas and adjacent continental margins of Brazil .1. Amino acids and hexosamines
Provedor de dados: 5
Autores: Jennerjahn, Tc; Ittekkot, V.
The nature of sedimentary organic matter from mangroves and the continental margin of eastern Brazil (8 degrees-24 degrees S) has been investigated in order to obtain information on sources and diagenetic processes. The organic matter content of mangrove sediments is three to four times higher than the maximum content of continental margin sediments. Downslope distribution of organic carbon, nitrogen, amino acids and hexosamines shows an enrichment in water depths between 800 m and 1000 m. The distribution of individual amino acids and hexosamines is highly variable in sedimentary organic matter from mangroves and the continental margin, and the observed compositional differences are mainly due to diagenetic alteration. Organic matter is highly reactive in...
Tipo: Text
Palavras-chave: Organic carbon; Amino acids; Carbon cycle; Mangroves; Continental margin.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/00093/20403/18070.pdf

Poultry Litter and Pig slurry Applications in an Integrated Crop-Livestock System
Provedor de dados: 90
Autores: Hentz,Paulo; Corrêa,Juliano Corulli; Fontaneli,Renato Serena; Rebelatto,Agostinho; Nicoloso,Rodrigo da Silveira; Semmelmann,Claudio Eduardo Neves.
ABSTRACT Organic fertilizers derived from poultry litter and pig slurry are alternatives to mineral fertilizers in increasing soil nutrient availability. The aim of this study was to evaluate soil response, through characterization of organic C and available N, P, and K contents, and corn yield response to increasing amounts of poultry litter, pig slurry, and mineral fertilizers in an integrated crop-livestock production system (ICL) from 2011 to 2013. The experimental design consisted of randomized blocks in a 4 × 3 + 1 factorial arrangement with four replicates. The treatments consisted of four types of fertilizer, two organic (poultry litter and pig slurry) and two mineral, balanced with the same amounts of N, P and K as the organic fertilizers, one of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mineral fertilizers; Organic carbon; Nitrogen.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100535

Quantitative differentiation between soil organic carbon and biochar carbon in Aridisol
Provedor de dados: 118
Autores: Lara,Nelson; Figueroa,Leonardo; Carvajal,Fabiola; Zapata,Yubinza; Urbina,Camilo; Escobar,Hugo.
N. Lara, L. Figueroa, F. Carvajal, Y. Zapata, C. Urbina, and H. Escobar. 2013. Quantitative differentiation between soil organic carbon and biochar carbon in Aridisol. Cien. Inv. Agr. 40(2): 387-395. To understand the effect of biochar, identify its presence and quantify its stability in soil, it is necessary to differentiate between the two main sources of carbon. These sources are resident soil organic matter and biochar, which is produced by burning organic matter under low oxygen concentration in a process known as pyrolysis. The present study employs solid-liquid extraction with an alkaline solution, the efficiency of which was improved by a reflux system and quantification using the modified Walkley-Black method, to distinguish the two carbon sources...
Tipo: Journal article
Palavras-chave: Alkaline extraction; Differentiate; Humic acid; Organic carbon.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000200013

Relationship between the mass of organic matter and carbon in soil
Provedor de dados: 52
Autores: Bianchi,Silmara R.; Miyazawa,Mario; Oliveira,Edson L. de; Pavan,Marcos Antonio.
The quantity of soil organic matter (SOM) was estimated through the determination of soil organic carbon (SOC) times a factor, which assumes that 58% of the SOM was formed by carbon. A number of soil samples with wide range of SOC content collected in the state of Paraná, Brazil were evaluated in the laboratory. SOC was measured by Walkley-Black method and the total SOM by loss on ignition. The SOC was positively correlated with SOM. The SOM/SOC ratio varied from 1.91 to 5.08 for the soils. It shows that Brazilian SOM has greater oxidation degree. Although, the SOM and SOC decreased with soil depth the SOM/SOC ratio increased. It showed that SOM in the subsoil contained more oxygen but less carbon than the SOM in the upper soil surface. The CEC/SOC also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Tropical soils; Soil analysis.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200005

Routing of terrestrial organic matter from the Congo River to the ultimate sink in the abyss: a mass balance approach (André Dumont medallist lecture 2017)
Provedor de dados: 5
Autores: Baudin, François; Rabouille, Christophe; Dennielou, Bernard.
We address the role of the Congo River sediment dispersal in exporting and trapping organic carbon into deep offshore sediments. Of particular interest is the Congo submarine canyon, which constitutes a permanent link between the terrestrial sediment sources and the marine sink. The Congo River delivers an annual sediment load of ~40 Tg (including 2 Tg of C) that feed a mud-rich turbidite system. Previous estimates of carbon storage capacity in the Congo turbidite system suggest that the terminal lobe complex accounts for ~12% of the surface area of the active turbidite system and accumulates ~18% of the annual input of terrestrial particulate organic carbon exiting the Congo River. In this paper, we extend the approach to the whole active turbidite...
Tipo: Text
Palavras-chave: Recent sediments; Congo turbidite system; Organic carbon; Burial efficiency; Source-to-sink.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00622/73394/72611.pdf

Seasonal variability of the advective transport of particulate matter and organic carbon in the Gulf of Lion (NW Mediterranean)
Provedor de dados: 5
Autores: Lapouyade, Agnes; Durrieu De Madron, Xavier.
Nine hydrographic cruises were performed on the Gulf of Lion continental margin between June 1993 and July 1996. These observations are analysed to quantify the fluxes of particulate matter and organic carbon transported along the slope by the Northern Current and to characterise their seasonal variability. Concentration of particulate matter and organic carbon are derived from light-transmission data and water sample analyses. The circulation is estimated from the geostrophic current field. The uncertainty on the transport estimate, related to the error on the prediction of particle concentrations from light-transmission data and the error on velocities, is assessed. The particulate matter inflow entering the Gulf of Lion off Marseille is comparable to...
Tipo: Text
Palavras-chave: Transport advectif; Bilans; Golfe du Lion; Matière particulaire; Carbone organique; Advective transport; Budget; Gulf of Lion; Organic carbon; Particulate matter.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43357/42823.pdf

Seasonal variations of downward particle fluxes in front of a reef pass (Moorea Island, French Polynesia)
Provedor de dados: 5
Autores: Schrimm, M; Heussner, S; Buscail, R.
Downward particle fluxes off the Taotoi Pass, a typical Polynesian lagoon pass, have been measured over an annual cycle by means of an array of three mooring lines deployed at 40 m depth on the external sandy plain seawards of the Tiahura reef. Each line was equipped with two hand-operated sediment traps located 1.5 and 10 m above the bottom. During the 1-year survey, the traps were deployed for seven periods of 2-3 weeks. One line equipped with an automated trap was further deployed at 400 m depth on the deep fore-reef slope to collect deep settling particles over two consecutive 6-month periods. For all periods investigated, fluxes on the external plain were highest in front of the pass, and decreased by half on either side (up- and downstream with...
Tipo: Text
Palavras-chave: Flux particulaire; Exportation de carbone; Récif corallien; Carbone organique; Carbonate; Particle flux; Carbon export; Coral reefs; Organic carbon; Carbonate.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00322/43320/42934.pdf

Soil chemical attributes in a high biodiversity silvopastoral system
Provedor de dados: 109
Autores: Zin Battisti,Luiz Fernando; Schmitt Filho,Abdon Luiz; Loss,Arcángelo; Sinisgalli,Paulo Antonio de Almeida.
Abstract The use of conservation managements such as the silvopastoral system, and the Voisin rational grazing system have been excellent alternatives to increase animal welfare and production efficiency and improve soil chemical attributes of degraded pastures. Therefore, the objective of this work was to evaluatethe effect of a High Biodiversity Silvopastoral System (SPSNUCLEUS) on the soil chemical attributes through comparisons with soils of a Intensive Grazing Management without trees (IGM), primary forest, and secondary forest areas. Total organic carbon, total nitrogen, pH, Al, H+Al, Ca, Mg, K, and P were evaluated after four years of implementation of SPSNUCLEUS. Soil samples from the layers 0-5, 5-10, 10-20, 20-30, and 30-40 cm were collected in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Nitrogen; Tree component; Voisin rational grazing; Soil fertility.
Ano: 2018
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000400486

SOIL ORGANIC MATTER FRACTIONS IN PRESERVED AND DISTURBED WETLANDS OF THE CERRADO BIOME
Provedor de dados: 90
Autores: Sousa,Ricardo Fernandes de; Brasil,Eliana Paula Fernandes; Figueiredo,Cícero Célio de; Leandro,Wilson Mozena.
Veredas are humid tropical ecosystems, generally associated to hydromorphic soils and a shallow water table. The soils of these ecosystems are affected by the use of the areas around these veredas. The objective of this study was to determine soil organic matter (SOM) fractions in veredas adjacent to preserved (native savanna) and disturbed environments (agricultural areas and pastures) in the Cerrado biome. Soil samples were collected from the 0-10 and 10-20 cm layers along reference lines drawn along the relief following the upper, middle and lower positions of one of the slopes, in the direction of the draining line of the vereda. The soil analysis determined: total soil OC, total nitrogen and C:N ratio; C and N contents and C:N ratio in particulate and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hydromorphic soils; Land use; Particulate fraction; Humic substances; Organic carbon.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100222

Spatial variability of microbial biomass and organic matter labile pools in a haplic planosol soil
Provedor de dados: 53
Autores: Loureiro,Diego Campana; De-Polli,Helvécio; Ceddia,Marcos Bacis; Aquino,Adriana Maria de.
The objective of this work was to study the spatial variability of soil microbial biomass (SMB) and labile soil organic matter pools (labile SOM), under different management systems and plant cover. The experiment was conducted in a Haplic Planosol soil on an Integrated Agroecological Production System (SIPA), in Seropédica, Rio de Janeiro. The evaluated management systems were: alley cropping, pasture, and bush garden, the late one was used as reference area. Three grids of regular spacing of 2.5 x 2.5 meters were used for sampling, consisting of 25 georeferenced points each, where soil samples were taken at 0-10 cm depth. The following labile constituents of soil organic matter were determined: free light fraction (FLF), water soluble C and N, C and N of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic carbon; Geoestatistic; Glomalin; Precision agriculture.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500010

Temperature effect on CARBON biomass in soils FROM TROPICAL AND TEMPERATE REGIONS
Provedor de dados: 63
Autores: Vasconcellos,C.A.
Four soils from various origins, (tropical and temperate regions) were amended with 14C labelled glucose (1mg C.g-1 soil) and incubated at 15ºC and 35ºC to determine the temperature effect on the carbon turnover and on the microbial biomass. The temperature effect on the biomass increased with the glucose addition. The biomass mineralization rates were higher at 35ºC than at 15ºC and higher for Woburn and Pegwell soils (temperate region) than for Capinopolis and Janauba (tropical region). Specific respiration rate (SRR) of new biomass (from glucose) and old biomass showed different behaviors between soils. At 15ºC, the turnover C was 207, 225, 115 and 141 days for Janauba, Capinopolis, Woburn and Pegwell soil, respectively. At 35ºC, it was 92, 69, 69 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon biomass; Organic carbon; Soil; Temperature; Turnover.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100016

Tensile strength, friability, aggregation, and soil organic matter physical fractions of an Oxisol cultivated with sugarcane
Provedor de dados: 86
Autores: Kunde,Roberta Jeske; Lima,Cláudia Liane Rodrigues de; Silva,Sérgio Delmar dos Anjos e; Pillon,Clenio Nailto.
Abstract: The objective of this work was to evaluate the tensile strength, friability, aggregation, and the physical fractions of soil organic matter of a Rhodic Hapludox cultivated with sugarcane (Saccharum officinarum). The treatments consisted of one, three, and five years of cultivation of sugarcane, in the state of Rio Grande do Sul, Brazil. As a reference, a native forest adjacent to the cultivation area, with soil and relief characteristics similar to those of the cultivation areas, was used. Deformed samples were collected at 0.00-0.05, 0.05-0.10, and 0.10-0.20-m soil depths, for the determination of the soil physical attributes and for the physical fractionation of particle-size and density of the organic matter. The physical attribute evaluations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Saccharum officinarum; Organic carbon; Organic matter fractionation; Soil physical quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000400487

Winter pasture and cover crops and their effects on soil and summer grain crops
Provedor de dados: 86
Autores: Balbinot Junior,Alvadi Antonio; Veiga,Milton da; Moraes,Anibal de; Pelissari,Adelino; Mafra,Álvaro Luiz; Piccolla,Cristiano Dela.
The objective of this work was to evaluate the effect of winter land use on the amount of residual straw, the physical soil properties and grain yields of maize, common bean and soybean summer crops cultivated in succession. The experiment was carried out in the North Plateau of Santa Catarina state, Brazil, from May 2006 to April 2010. Five strategies of land use in winter were evaluated: intercropping with black oat + ryegrass + vetch, without grazing and nitrogen (N) fertilization (intercropping cover); the same intercropping, with grazing and 100 kg ha-1 of N per year topdressing (pasture with N); the same intercropping, with grazing and without nitrogen fertilization (pasture without N); oilseed radish, without grazing and nitrogen fertilization...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Compaction; Cover crops; Crop-livestock integration; No-tillage; Organic carbon.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001000032

Сезонная изменчивость отношения органического углерода к хлорофиллу «а» и  факторы, ее определяющие в фитопланктоне прибрежных вод Черного моря
Provedor de dados: 13
Autores: Стельмах, Л. В.; Бабич, И. И.
На основе данных, полученных на пяти станциях в прибрежных поверхностных водах Черного моря (в районе Севастополя) в 2002 – 2003 гг., представлена сезонная динамика отношения С:хл “a” в нано- и микрофитопланктоне. В течение года этот показатель изменялся приблизительно на порядок. Наибольшие значения отношения (400 – 500) были получены в летний период (в июле), когда интенсивность солнечной радиации достигала максимума, а концентрация нитратов снижалась до аналитического ноля. Наименьшие величины (30 – 50) отмечены зимой при минимальных интенсивностях солнечной радиации и  относительно высоких (4 – 25 мкМ) концентрациях нитратов. Представлены регрессионные зависимости, отражающие комбинированное действие света, температуры, биогенных веществ и видового...
Tipo: Journal Contribution
Palavras-chave: Хлорофилл "a"; Органический углерод; Фитопланктон; Свет; Биогенные вещества; Черное море; Сhlorophyll "a"; Phytoplankton; Organic carbon; Light; Nutrients; Black Sea Phytoplankton Organic carbon Light Nutrients (mineral) Light Phytoplankton http://aims.fao.org/aos/agrovoc/c_4322 http://aims.fao.org/aos/agrovoc/c_13344.
Ano: 2006
URL: http://repository.ibss.org.ua/dspace/handle/99011/315