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Registros recuperados: 113
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13C NMR and EPR spectroscopic evaluation of oil shale mined soil recuperation. Repositório Alice
SANTOS, J. V. dos; MANGRICH, A. S.; PEREIRA, B. F.; PILLON, C. N.; NOVOTNY, E. H.; BONAGAMBA, T. J.; ABBT-BRAUNG, G.; FRIMMEL, F. H..
In this work, native forest soil (NFS) organic matter (SOM) sample and SOM samples from a neighboring forest soil area of an oil shale mine which is being rehabilitated for thirty years (RFS) were analyzed. X-band electron paramagnetic resonance (EPR) and solid-state 13C nuclear magnetic resonance (NMR) spectroscopies were used to evaluate the soil reclamation of the Brazilian oil shale mining process. Two-dimensional heterospectral correlation studies of the results obtained from EPR and 13C NMR were used to obtain information about SOM structures and their interactions with residual paramagnetic metal ion. The signal of the residual metallic oxycation, VO2+ correlated positively with uronic acid-type hydrophilic organic structures, determined from the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: 13C NMR spectroscopy; Study of mining soil recuperation; 2D hetero-spectral correlation spectroscopy; Soil organic matter.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/981314
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Adubação Verde na Produção Orgânica de Abacaxi na Chapada Diamantina, BA. Repositório Alice
DIAS, F. P. M.; XAVIER, F. A. da S..
A prática da adubação verde promove benefícios ao solo, dentre estes, aumenta os teores de matéria orgânica, favorece a ciclagem de nutrientes e mantém a cobertura do solo. O presente trabalho objetivou avaliar a produção de biomassa vegetal e os estoques de carbono (C) e macronutrientes na matéria seca de diferentes espécies de adubos verdes utilizados em pré-plantio na cultura do abacaxi.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Adubação verde; Abacaxi; Green manure; Pineapples; Biogeochemical cycles; Soil organic matter.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/966276
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Alterações microbianas e químicas de um gleissolo sob macaubeiras nativas em função da variação sazonal e espacial. Repositório Alice
DINIZ, L. T.; RAMOS, M. L. G.; VIVALDI, L. J.; ALENCAR, C. M. de; JUNQUEIRA, N. T. V..
RESUMO: A macaúba (Acrocomia aculeata) é uma alternativa para a produção de biodiesel e, consorciada com pastagem, pode auxiliar na recuperação de áreas degradadas. O objetivo deste trabalho foi estudar as alterações nos atributos microbiológicos, na matéria orgânica e no N total do solo, em função da variação sazonal e espacial em um Gleissolo sob maciço de macaubeiras nativas, no Cerrado. O estudo observacional foi realizado na região de Planaltina de Goiás, na Fazenda Agropecuária Santa Fé. Foram selecionadas dez árvores em uma mata com macaubeiras nativas no bioma cerrado. A coleta de solo foi realizada na camada de 0 a 10 centímetros de profundidade, sob uma linha horizontal, imaginária, traçada a partir da base do caule das macaubeiras. As amostras...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Qualidade do solo; Indicadores microbiológicos; Macaúba; Matéria orgânica; Solo; Cerrado; Soil quality; Acrocomia aculeata; Indicator species; Soil organic matter; Biodiesel.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1008513
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Alterações na fertilidade química dos solos em áreas de produção familiar de mandioca no Território do Alto Sertão de Alagoas. Repositório Alice
FERNANDES, M. F.; PROCOPIO, S. de O.; BASTOS, D. F. de; MACHADO, T. N..
Objetivou-se neste trabalho identificar alterações na fertilidade química dos solos (FQS) em resposta ao cultivo de mandioca em áreas de produção familiar no Território do Alto Sertão Alagoano. Amostras de solo de sítios cultivados e sob vegetação nativa em 12 propriedades agrícolas foram avaliadas quanto a pH, matéria orgânica (MO), P, K, Ca, Mg, Al+H e CTC. A análise conjunta destas variáveis indicou que a FQS foi associada a fatores inerentes do solo e ao tempo de cultivo. Níveis baixos de P, Ca, Mg, MO e CTC sob cultivo ocorreram mesmo em áreas de fertilidade natural elevada.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Complexo sortivo do solo; Mandioca; Matéria orgânica; Fósforo; Cassava; Manihot esculenta; Soil organic matter; Phosphorus.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1013972
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Alterações nas propriedades físicas de um Latossolo Amarelo Distrocoeso em função da aplicação de carvão vegetal. Repositório Alice
BRITO, R. B. F.; SOUZA, L. D.; SOUZA, L. da S..
A necessidade de adequação dos sistemas de produção agrícola tem estimulado a busca de novos manejos do solo. A evolução tem procurado uma maior capacidade para diminuir a emissão e aumentar a conversão do carbono do solo.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Solo; Carvão vegetal; Soil; Soil degradation; Soil organic matter; Soil water characteristic.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/966061
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Aveia preta para cobertura vegetal do solo EMBRAPA 140 (Campeira-Mor). Infoteca-e
GAUDENCIO, C. de A..
Cultivar de aveia preta (Avena strigosa): Embrapa 140 (Campeira-Mor). Origem. Características fenológcias.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Cobertura do solo; Matéria orgânica; Cobertura vegetal; Solo; Plantio direto; Vegetation cover; Soil organic matter; No-tillage.
Ano: 1998 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/461398
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Calibration and validation of models for short-term decomposition and N mineralization. Repositório Alice
NASCIMENTO, A. F. do; MENDONÇA, E. de S.; LEITE, L. F. C.; SCHOLBERG, J.; NEVES, J. C. L..
Insight of nutrient release patterns associated with the decomposition of plant residues is important for their effective use as a green manure in food production systems. Thus, this study aimed to evaluate the ability of the Century, APSIM and NDICEA simulation models for predicting the decomposition and N mineralization of crop residues in the tropical Atlantic forest biome, Brazil. The simulation models were calibrated based on actual decomposition and N mineralization rates of three types of crop residues with different chemical and biochemical composition. The models were also validated for different pedo-climatic conditions and crop residues conditions. In general, the accuracy of decomposition and N mineralization improved after calibration. Overall...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Modeling; Nutrient cycling; Organic agriculture; Soil organic matter.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/979454
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Calibration and validation of models for short-term decomposition and N mineralization of plant residues in the tropics. Repositório Alice
NASCIMENTO, A. F. do; MENDONÇA, E. de S.; LEITE, L. F. C.; SCHOLBERG, J.; NEVES, J. C. L..
Insight of nutrient release patterns associated with the decomposition of plant residues is important for their effective use as a green manure in food production systems. Thus, this study aimed to evaluate the ability of the Century, APSIM and NDICEA simulation models for predicting the decomposition and N mineralization of crop residues in the tropical Atlantic forest biome, Brazil.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Modelagem; Agricultura orgânica; Matéria orgânica do solo; Modeling; Organic agriculture; Soil organic matter.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/943638
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Calibration and validation of models for short-term decomposition and N mineralization of plant residues in the tropics Scientia Agricola
Nascimento,Alexandre Ferreira do; Mendonça,Eduardo de Sá; Leite,Luiz Fernando Carvalho; Scholberg,Johannes; Neves,Julio Cesar Lima.
Insight of nutrient release patterns associated with the decomposition of plant residues is important for their effective use as a green manure in food production systems. Thus, this study aimed to evaluate the ability of the Century, APSIM and NDICEA simulation models for predicting the decomposition and N mineralization of crop residues in the tropical Atlantic forest biome, Brazil. The simulation models were calibrated based on actual decomposition and N mineralization rates of three types of crop residues with different chemical and biochemical composition. The models were also validated for different pedo-climatic conditions and crop residues conditions. In general, the accuracy of decomposition and N mineralization improved after calibration. Overall...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Modeling; Nutrient cycling; Organic agriculture; Soil organic matter.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000600008
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Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols Rev. Bras. Ciênc. Solo
Valladares,Gustavo Souza; Pereira,Marcos Gervasio; Benites,Vinícius de Melo; Anjos,Lúcia Helena Cunha dos; Ebeling,Adierson Gilvani; Guareschi,Roni Fernandes.
ABSTRACT Despite limited geographic expression of Organosols in Brazil, their high carbon storage capacity and natural environmental vulnerability justifies further studies on C and N stocks in these soils and their relationship to the nature of organic matter. Evaluation of physical and chemical properties of organic soils and their ability to store C is important so as to develop sustainable management practices for their preservation. The objectives of the study were to measure the total organic carbon stock (OCst), total nitrogen stock (Nst), and humic fractions in Organosols from different environments and regions of Brazil, and to correlate the data with soil chemical (pH, P, K, Ca2+, Mg2+, Al3+, H+Al, CEC, V) and physical properties (soil bulk...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil organic matter; Humic substances; Histic horizon; Physical and chemical properties.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100425
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Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil Scientia Agricola
Bernardi,Alberto Carlos de Campos; Machado,Pedro Luiz Oliveira de Almeida; Madari,Beata Emoke; Tavares,Sílvio Roberto de Lucena; Campos,David Vilas Boas de; Crisóstomo,Lindbergue de Araújo.
Soil organic matter accumulation provides benefits to soil productivity and reduces atmospheric carbon concentration. However, little is known about the accumulation of C and N by sandy soils under perennial irrigated crops in semiarid regions. The objective of this study was to evaluate the effect of irrigated fruit orchard cultivation on the stocks of soil organic carbon (SOC) and total nitrogen (N) of an Arenosol/Quartzpsament from Paraipaba-CE, Semiarid Brazil. Soil samples were taken from irrigated orchards of banana (Musa ssp.), cashew (Anacardium ocidentale), guava (Psidium guajava), bullock's heart (Annona reticulata), mango (Mangifera indica), and sapote (Manilkara zapota) in the wetted-bulb and non-irrigated area between the plant rows....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Caatinga forest; Soil organic matter; Soil stratification index.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000200010
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Carbon in physical fractions and organic matter chemical composition of an acrisol after amazon forest burning and conversion into pasture. Repositório Alice
LEAL, O. A.; DICK, D. P.; COSTA, F. de S.; KNICKER, H.; CARVALHO JÚNIOR, J. A. de; SANTOS, J. C..
The aim of this study was to investigate impacts of Amazon Forest (AF) fire and conversion to pasture on carbon accumulation in particle size fractions and organic matter (OM) composition of an Acrisol. Soil samples were collected (0.00-2.00 m depth) in three sites: native AF (NAF); AF under natural regeneration for two years after burning (BAF); 23-years old Brachiaria pasture after AF burning (BRA). Assuming NAF area as reference, BAF and BRA areas showed negative carbon balance when carbon emitted to the atmosphere at AF burning is taken into account. Soil OM aromaticity and hydrophobicity, assessed via 13C nuclear magnetic resonance, in BRA and BAF were similar to that in NAF. Fire and post-fire land use altered the carbon distribution in sand, silt...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Bosque tropical húmedo; Suelos quemados; Regeneración natural; Materia orgánica del suelo; Reservorios de carbono; Acrisoles; Fazenda Santa Luzia; Cruzeiro do Sul (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Floresta Tropical; Fogo; Impacto Ambiental; Regeneração Natural; Matéria Orgânica; Carbono; Estoque; Argissolos; Saturação; Tropical rain forests; Burnt soils; Environmental impact; Natural regeneration; Soil organic matter; Carbon sinks; Acrisols.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1096433
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Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems Scientia Agricola
Reis,Cecília Estima Sacramento dos; Dick,Deborah Pinheiro; Caldas,Jennifer da Silva; Bayer,Cimélio.
The capacity of soils to sequestrate carbon (C) is mainly related to the formation of organo-mineral complexes. In this study, we investigated the influence of soil management systems on the C retention capacity of soil with an emphasis on the silt and clay fractions of two subtropical soils with different mineralogy and climate. Samples from a Humic Hapludox and a Rhodic Hapludox, clayey soils cultivated for approximately 30 years under no-tillage (NT) and conventional tillage (CT) were collected from six layers distributed within 100-cm soil depth from each site and from an adjacent native forest. After the removal of particulate organic matter (POM), the suspension (<53 µm) was sonicated, the silt and clay fractions were separated in accordance with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon saturation; Mineralogy; Physical fractionation; Soil organic matter; Soil profile.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400006
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Carbon stock and humification index of organic matter affected by sugarcane straw and soil management Scientia Agricola
Segnini,Aline; Carvalho,João Luís Nunes; Bolonhezi,Denizart; Milori,Débora Marcondes Bastos Pereira; Silva,Wilson Tadeu Lopes da; Simões,Marcelo Luiz; Cantarella,Heitor; Maria,Isabella C. de; Martin-Neto,Ladislau.
The maintenance of sugarcane (Saccharum spp.) straw on a soil surface increases the soil carbon (C) stocks, but at lower rates than expected. This fact is probably associated with the soil management adopted during sugarcane replanting. This study aimed to assess the impact on soil C stocks and the humification index of soil organic matter (SOM) of adopting no-tillage (NT) and conventional tillage (CT) for sugarcane replanting. A greater C content and stock was observed in the NT area, but only in the 0-5 cm soil layer (p < 0.05). Greater soil C stock (0-60 cm) was found in soil under NT, when compared to CT and the baseline. While C stock of 116 Mg ha-1 was found in the baseline area, in areas under CT and NT systems the values ranged from 120 to 127...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Laser-Induced Fluorescence Spectroscopy; Sugarcane replanting; Crop residues; No-tillage; Soil organic matter.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500006
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Carbon stocks in organic matter fractions as affected by land use and soil management, with emphasis on no-tillage effect Ciência Rural
Bayer,Cimélio; Dick,Deborah Pinheiro; Ribeiro,Genicelli Mafra; Scheuermann,Klaus Konrad.
Land use and soil management may affect both labile and humified soil organic matter (SOM) fractions, but the magnitude of these changes is poorly known in subtropical environments. This study investigated effects of four land use and soil management systems (forest, native pasture, and conventional tillage and no-tillage in a wheat/soybean succession) on (i) total soil organic carbon (SOC) stocks (0 to 250mm depth) and on (ii) carbon (C) stocks in labile (coarse, light) and humified (mineral-associated, humic substances) SOM fractions (0 to 25mm depth), in a Hapludox soil from southern Brazil. In comparison to the adjacent forest site, conventionally tilled soil presented 36% (46.2Mg ha-1) less SOC in the 0 to 250mm depth and a widespread decrease in C...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil organic matter; Physical fractionation; Light fraction; Coarse fraction; No-tillage.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782002000300006
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Carbon stocks of an Oxisol after thirty-eight years under different tillage systems AGRIAMBI
Magalhaes,Sulamirtes S. de A.; Ramos,Fabricio T.; Weber,Oscarlina L. dos S..
ABSTRACT Soil carbon (C) stock determination can subsidize discussions on the continuity of an agricultural management. This study aimed to evaluate the stocks of total organic C (STOC) and labile C (SLC), and the indices of C lability (CLI), C compartment (CCI) and C management (CMI), and correlate them with chemical and physical attributes of a Red Yellow Latosol (Oxisol) managed for 38 years with different tillage systems in a Cerrado region of Mato Grosso, Brazil. Disturbed and undisturbed soil samples were collected in three layers (0-0.05, 0.05-0.10 and 0.10-0.20 m). The CMI (CLI x CCI) showed higher STOC possibly as the tillage depth decreased, because none of the tillage systems conserved STOC and SLC in the layers of 0-0.05 and 0.05-0.10 m,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil conservation; Crop rotation; Soil organic matter.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100085
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Carbono e nitrogênio do solo submetido a sistemas agroflorestais com seringueira no Estado do Acre. Infoteca-e
COSTA, F. de S.; OLIVEIRA, T. K. de; BARDALES, N. G.; COSTA, C. R. da.
Os sistemas agroflorestais (SAFs) são uma alternativa viável para uso conservacionista do solo na Amazônia Brasileira, gerando renda para o produtor rural, aumentando a biodiversidade e a captura de carbono da atmosfera no solo e na vegetação. Considerando a importância desses aspectos, a pesquisa com SAFs está em processo de ampliação com foco, também, em mensuração de serviços ambientais associados. Este documento é fruto da cooperação dos conhecimentos tecnológico e tradicional na retomada do tema de SAF para o desenvolvimento rural na Amazônia. Apresenta parte inicial do conhecimento gerado desde o desenho do SAF em 2010 até o ano de 2015, enfatizando o que acontece com o solo na transição para SAFs. Destaca a importância de experimentos de longa...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Sistema Agroflorestal (SAF); Agricultura conservacionista; Consórcio agroflorestal; Ruber tree; Caucho; Colocação São Luís; Seringal Porvir; Epitaciolândia (AC); Fazenda São João; Senador Guiomard (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Agrossilvicultura; Seringueira; Hevea brasiliensis; Solo; Matéria orgânica; Carbono; Nitrogênio; Agroforestry; Soil organic matter; Carbon sinks; Soil organic nitrogen; Agroforestería; Materia orgánica del suelo; Reservorios de carbono; Nitrógeno orgánico del suelo.
Ano: 2016 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/1072228
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Changes in quantity and quality of soil carbon due the land-use conversion to sugarcane (Saccharum officinarum) plantation in southern Brazil. Repositório Alice
BORDONAL, R. O.; LAL, R.; RONQUIM, C. C.; FIGUEIREDO, E. B.; CARVALHO, J. L. N.; MALDONADO JUNIOR, W.; MILORI, D. M. B. P.; SCALA JUNIOR, N. L..
bitstream/item/165905/1/PROCI-17-Changes-in-quantity-and-quality....pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Sugarcane expansion; Ethanol production; Soil management; Soil organic matter; Laser-induced fluorescence spectroscopy; Sustainability.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078594
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Changes in quantity and quality of soil carbon due to the land-use conversion to sugarcane (Saccharum officinarum) plantation in southern Brazil. Repositório Alice
BORDONAL, R. DE O.; LAL, R.; RONQUIM, C. C.; FIGUEIREDO, E. B. DE; CARVALHO, J. L. N.; MALDONADO JUNIOR, W.; MILORI, D. M. B. P.; LA SCALA JUNIOR.
Soil organic carbon (SOC) plays an important role for soil quality and its conservation is affected by the land-use change (LUC) associated with sugarcane (Saccharum officinarum) expansion. This study was based on the hypothesis that: (i) LUC from perennial crops (e.g., coffee and citrus) and extensive pasture to sugarcane plantation results in depletions of soil carbon (C) stock and its quality; and (ii) transition of annual crops to sugarcane increases soil C stock and improves its quality. Therefore, the objective of this study was to assess changes in soil C stocks and the humification levels of soil organic matter (SOM) upon conversion of different land uses (coffee, citrus, annual crop and pasture) into sugarcane plantation in the Mococa region,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Sugarcane expansion; Laser-induced fluorescence spectroscopy; Sustainability; Espectroscopia de fluorescência induzida por laser; Sustentabilidade; Cana de açúcar; Etanol; Manejo do solo; Matéria orgânica; Ethanol production; Soil management; Soil organic matter; Fluorescence emission spectroscopy.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1065652
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Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5 Rev. Bras. Ciênc. Solo
Weber,Mirla Andrade; Mielniczuk,João; Tornquist,Carlos Gustavo.
ABSTRACT The Century model has successfully simulated soil organic matter dynamics in many agroecosystems. However, initial applications in southern Brazil produced mixed results. The objective of this study was to calibrate and validate Century 4.5 to simulate soil carbon (C) and nitrogen (N) dynamics under diverse soil management practices in subtropical Brazil. Soil C and N data from two long-term experiments established on a degraded Acrisol in the early 1980s were used. Treatments were conventional or no-tillage; grass or grass/legume cropping systems; and corn with or without mineral N fertilizer. The calibration process iteratively modified model parameters to match simulated values of C additions and Soil Organic Carbon (SOC) and Soil Organic...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cover crop; Carbon storage in soil; Soil tillage; Soil organic matter.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100519
Registros recuperados: 113
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