Consulta: subjectFacets:"Soil organic matter"
Registros recuperados: 60
Data/hora: 03/06/2024 07:21:17

Impacto de diferentes sistemas de uso no carbono orgânico total e mineralizável do solo sob solo arenoso
Provedor de dados: 196
Autores: Lopes , Giovana Tetsuya; Rosset, Jean Sérgio; Ozório, Jefferson Matheus Barros; Maiane Mendes da Silva, Ozielly; Vieira dos Santos, Wesley; Victor Hugo dos Santos, José; dos Santos Gonçalves, Andrea; Marra, Leandro Marciano.
O objetivo deste trabalho foi avaliar o impacto de diferentes sistemas de uso nos teores e estoques de carbono orgânico total (COT) e a evolução diária e total do carbono mineralizável (C-CO2) em um Argissolo Vermelho Amarelo de textura arenosa. O estudo foi realizado no município de Eldorado, MS, em uma área de referência de Mata Nativa (MN), e em três áreas manejadas: pastagem permanente (PP), semeadura direta (SD) e área de Reserva Particular de Patrimônio Natural em processo de regeneração natural (RPPN). Amostras de solo das camadas 0,0-0,05, 0,05-0,10 e 0,10-0,20 m foram coletadas para avaliação de densidade do solo (Ds), teores de COT, com posteriores cálculos do índice de estratificação (IE), estoque de carbono (EstC) e variação do estoque de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic matter; Private Natural Heritage Reserve (PNHR); Conservation unit; Matéria orgânica do solo; Reserva Particular do Patrimônio Natural (RPPN); Unidade de conservação.
Ano: 2022
URL: http://periodicosonline.uems.br/index.php/agrineo/article/view/6991

Panarchy Rules: Rethinking Resilience of Agroecosystems, Evidence from Dutch Dairy-Farming
Provedor de dados: 7
Autores: van Apeldoorn, Dirk F.; Land Dynamics Group, Wageningen University; Alterra, Wageningen UR; dirk.vanapeldoorn@wur.nl; Kok, Kasper; Land Dynamics Group, Wageningen University; Kasper.Kok@wur.nl; Sonneveld, Marthijn P.W.; Land Dynamics Group, Wageningen University ; marthijn.sonneveld@wur.nl; Veldkamp, Tom (A.);  Land Dynamics Group, Wageningen University; Alterra, Wageningen UR; University of Twente, ITC faculty ; veldkamp@itc.nl.
Resilience has been growing in importance as a perspective for governing social-ecological systems. The aim of this paper is first to analyze a well-studied human dominated agroecosystem using five existing key heuristics of the resilience perspective and second to discuss the consequences of using this resilience perspective for the future management of similar human dominated agroecosystems.  The human dominated agroecosystem is located in the Dutch Northern Frisian Woodlands where cooperatives of dairy farmers have been attempting to organize a transition toward more viable and environmental friendly agrosystems. A mobilizing element in the cooperatives was the ability of some dairy farmers to obtain high herbage and milk yield production with limited...
Tipo: Peer-Reviewed Insight
Palavras-chave: Agroecosystems; Dairy farming; Panarchy; Northern Frisian Woodlands  The Netherlands; Resilience; Soil organic matter.
Ano: 2011

Fracionamento físico da matéria orgânica.
Provedor de dados: 14
Autores: CAMPOS, D. V. B. de; MACHADO, P. L. O. de A.
O fracionamento físico é utilizado para identificar a distribuição do carbono orgânico em diversos compartimentos com dinâmicas e funções definidas, e assim avaliar a sua qualidade, sendo mais útil para estudar a ciclagem do carbono no solo. Esse método de fracionamento físico apresenta resultados satisfatórios para o monitoramento de solos submetidos a diferentes usos e manejos, principalmente com a análise das camadas superficiais do solo, pela maior intensidade da deposição de resíduos orgânicos bem como da variação quanto à transformação desses resíduos. No fracionamento físico, primeiramente ocorre a separação dos materiais orgânicos do solo de baixa densidade (fração leve) da matéria orgânica associada às partículas areia, silte e argila (fração...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Matéria Orgânica; Solo; Fracionamento; Soil organic matter.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1094304

Manual de métodos de análise de solo.
Provedor de dados: 14
Autores: TEIXEIRA, P. C.; DONAGEMMA, G. K.; FONTANA, A.; TEIXEIRA, W. G.
Análises físicas; Análises químicas; Análises da matéria orgânica; Análises mineralógicas; Análises micromorfológicas.
Tipo: Livro técnico (INFOTECA-E)
Palavras-chave: Análise micromorfológica; Análise do solo; Física do solo; Química do solo; Matéria orgânica; Mineralogia; Soil analysis; Soil physics; Soil chemistry; Soil organic matter; Mineralogy; Soil micromorphology.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1085209

Carbono e nitrogênio do solo submetido a sistemas agroflorestais com seringueira no Estado do Acre.
Provedor de dados: 14
Autores: 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; Colocação São Luís; Seringal Porvir; Epitaciolândia (AC); Fazenda São João; Senador Guiomard (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Agroforestería; Materia orgánica del suelo; Nitrógeno orgánico del suelo; Reservorios de carbono.; Agrossilvicultura; Seringueira; Hevea brasiliensis; Solo; Matéria orgânica; Carbono; Nitrogênio; Caucho.; Agroforestry; Soil organic matter; Carbon sinks; Soil organic nitrogen.
Ano: 2016
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1072228

Recuperação de áreas de jazidas com espécies de ocorrência natural do Semiárido.
Provedor de dados: 14
Autores: ARAÚJO, F. P. de; BRANDAO, W. N.; MOREIRA, J. N.; TAURA, T. A.; CUNHA, T. J. F.; CORREIA, R. C.
A produção de energia elétrica sustentável por meio da instalação das torres eólicas, no município de Casa Nova, BA, a exemplo de outras localidades, é uma realidade e, se por um lado produz uma energia limpa, por outro lado, necessita construir estradas vicinais cascalhadas, objetivando o transporte das referidas torres, que são constituídas por peças longas e bastante pesadas, que por sua vez exigem caminhões de grande porte. Para a pavimentação foram utilizadas seis jazidas prospectadas, aleatoriamente, dentro da área dos parques no município, que resultaram na retirada de toda avegetação de uma área total de 16,5 hectares, com exceção das espécies ameaçadas de extinção a exemplo do umbuzeiro (Spondias tuberosa Arr.),baraúna (Schinopsis brasiliensis) e...
Tipo: Folhetos
Palavras-chave: Semiárdio; Jazida; Lago de Sobradinho; Torre Eólica; Caatinga; Solo; Degradação Ambiental; Recuperação do Solo; Cobertura Vegetal; Manejo do Solo; Manejo de Água; Natural resources; Arid soils; Soil degradation; Soil management; Soil mineralogy; Soil organic matter; Soil resource management.
Ano: 2020
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1124092

Solos com altos teores de matéria orgânica.
Provedor de dados: 14
Autores: FONTANA, A.; SOARES, P. F.; ANJOS, L. H. C. dos; VALLADARES, G. S.
Dentre as metodologias utilizadas nas avaliações dos solos com altos teores de matéria orgânica, destacam-se aquelas que avaliam a interação entre o elevado teor de matéria orgânica e outros atributos do solo como, por exemplo, a quantificação de matéria orgânica por gravimetria (método de combustão em mufla), além da determinação do teor de carbono orgânico por métodos como Walkley e Black modificado ou analisador elementar.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Solo; Matéria Orgânica; Soil organic matter.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1107350

Determinação dos teores de carbono orgânico em solos do Acre com diferentes procedimentos analíticos.
Provedor de dados: 14
Autores: SILVA, L. M. da; RODRIGUES, M. de J. M.; TAVARES, O. C. H.; SANTOS, O. A. Q. dos; WADT, P. G. S.; PEREIRA, M. G.
Os teores de carbono orgânico total (COT) no solo podem ser determinados por técnicas que se baseiam tanto na combustão por via úmida quanto por via seca. No entanto, a primeira apresenta-se como uma técnica demorada, porém, largamente utilizado nos laboratórios brasileiros para análise de solos. O objetivo da presente pesquisa é analisar os teores de carbono orgânico de solos do Acre submetidos à diferentes procedimentos analíticos. As amostras foram submetidas a diferentes condições de tratamento sendo aquecidas e não aquecidas, maceradas e não maceradas, bem como variar a concentração do titulante, sendo empregadas seis diferentes formas de determinação do carbono. Verificou-se que todos os métodos empregados apresentaram alta e significativa correlação...
Tipo: Folhetos
Palavras-chave: Carbono orgânico; Métodos analíticos; Formação Solimões; Acre; Amazônia Ocidental; Western Amazon; Química do Solo; Matéria Orgânica; Soil organic carbon; Soil chemistry; Soil organic matter; Analytical methods.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136679

Aveia preta para cobertura vegetal do solo EMBRAPA 140 (Campeira-Mor).
Provedor de dados: 14
Autores: 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/infoteca/handle/doc/461398

Estimacao da cobertura do solo por residuos culturais.
Provedor de dados: 14
Autores: SARAIVA, O. F.; TORRES, E.
bitstream/item/116675/1/id-22180001.pdf
Tipo: Séries anteriores (INFOTECA-E)
Palavras-chave: Manejo de resíduos culturais.; Solo; Matéria orgânica; Cobertura do Solo.; Soil fertility; Crop residues; Soil organic matter.
Ano: 1993
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/445605

Matéria orgânica.
Provedor de dados: 14
Autores: FONTANA, A.
A quantificação pela via seca em mufla por incineração representa uma opção de determinação total da matéria orgânica; contudo, não discrimina os diversos compartimentos componentes do solo, como aqueles minerais e orgânicos. Contudo, o valor de matéria orgânica obtido é satisfatório e o método é preferencialmente indicado para os solos com altos teores de matéria orgânica, como aqueles de composição orgânica (Pereira et al., 2006). Os solos de composição orgânica são definidos por apresentarem teor de carbono orgânico obtido pelo método via úmida (item 1.5) maior ou igual a 80 g kg-1, conforme definido no Sistema Brasileiro de Classificação de Solos (SiBCS) (Santos et al., 2013). Nesse grupo de solos estão os classificados como horizontes diagnósticos O e...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Matéria Orgânica; Análise do Solo; Soil organic matter; Soil analysis.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1107202

Fracionamento químico da matéria orgânica.
Provedor de dados: 14
Autores: BENITES, V. de M.; MACHADO, P. L. O. de A.; MADARI, B. E.; FONTANA, A.
O fracionamento consiste na obtenção de três frações, as quais são definidas operacionalmente em relação à solubilidade em função do pH da solução extratora (base ou ácido) e os resíduos: fração ácidos fúlvicos, fração ácidos húmicos e fração humina (Kononova, 1966; Schnitzer, 1978; Stevenson, 1994). Como definição geral, a fração ácidos fúlvicos apresenta cor amarelo-parda e é solúvel em qualquer valor de pH da solução; a fração ácidos húmicos, de cor castanho-escura, está solúvel em meio alcalino e insolúvel em meio ácido diluído, e a fração humina representa o resíduo insolúvel que permanece como precipitado (Kononova, 1966; Schnitzer, 1978; Stevenson, 1994). A quantificação do carbono orgânico nas frações húmicas é feita em alíquotas ou no resíduo a...
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Matéria Orgânica; Solo; Fracionamento; Húmus; Soil organic matter.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1094303

Caracterização espectroscópica da matéria orgânica em topossequências na Formação Solimões, Acre.
Provedor de dados: 14
Autores: SILVA, L. M. da; PEREIRA, M. G.; BERNINI, T. A.; ANJOS, L. H. C. dos; WADT, P. G. S.; TAVARES, O. C. H.; GARCIA, A. C.
A caracterização espectroscópica da matéria orgânica do solo (MOS) pode contribuir no entendimento da dinâmica da matéria orgânica em áreas sob floresta. O presente trabalho teve como objetivo realizar a caracterização da matéria orgânica por espectroscopia em horizontes superficiais de solos, formados a partir de material de origem de natureza sedimentar da Formação Solimões no estado do Acre. Foram selecionadas três topossequências sob floresta em diferentes regionais do Acre: Sena Madureira (T1) e Manoel Urbano (T2), na Regional do Purus, e Feijó (T3) na Regional do Tarauacá-Envira. Em cada topossequência foram abertas trincheiras em três pontos distintos: terço superior (S), terço médio (M) e terço inferior da elevação (I). Foi quantificado o carbono...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Materia orgánica del suelo; Espectroscopia infrarroja (por) transformada de Fourier; Formação Solimões; Solos sedimentares; Suelos sedimentarios; Sena Maureira (AC); Manoel Urbano (AC); Regional do Purus (AC); Feijó (AC); Regional do Tarauacá-Envira (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Solo; Matéria Orgânica; Sedimentary soils; Soil organic matter; Fourier transform infrared spectroscopy.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136538

Variação da disponibilidade de matéria seca em áreas de vazantes, Pantanal, MS.
Provedor de dados: 14
Autores: CRISPIM, S. M. A.; SANTOS, S. A.; SORIANO, B. M. A.
O estudo foi conduzido com o objetivo de avaliar a disponibilidade total de massa seca aérea (kg/ha/MS), composição botânica, frequência e cobertura do solo nessas áreas, no período de setembro/2014 a setembro/2016.
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Cobertura do Solo; Cobertura Seca; Matéria Orgânica; Soil organic matter.
Ano: 2017
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1087109

Soil organic matter management for tackling desertification
Provedor de dados: 19
Autores: Tsutsuki, Kiyoshi; 筒木, 潔.
2003年8月28日とかちプラザで開催､日本ユネスコ国内委員会主催の帯広農村開発教育国際セミナー(OASERD)国際連合ユネスコアジア太平洋地域教育開発計画事業(APEID)シンポジウム「地球にやさしい農業をめざして : 緑地回復と持続的農業」講演資料
Palavras-chave: Humic substances; Soil aggregate; Soil degradation; Soil organic matter; Land use.
Ano: 2003
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1906

Modelagem da distribuição de frequência de teores carbono orgânico do solo sob Floresta Ombrófila Mista no Paraná
Provedor de dados: 190
Autores: Barreto, Tauane Garcia; Klein Hentz, Ângela Maria; Netto, Sylvio Péllico; Corte, Ana Paula Dalla; Sanquetta, Carlos Roberto.
Neste trabalho objetivou-se modelar o teor de carbono no solo de parcelas sob Floresta Ombrófila Mista em condições distintas (predomínio de araucária, de imbuia e vegetação mista com registro de ocorrência de fogo), no Paraná, a partir de distribuições probabilísticas. Para tal, foi avaliada a qualidade de ajuste e aderência de diferentes funções de probabilidade (normal, Weber, Weibull 3P, log-normal, SB de Johnson e Gama), pelo teste de Kolmogorov-Smirnov. Todas as funções densidade de probabilidade resultaram em bons ajustes, podendo então ser utilizadas para modelar os dados de carbono no solo em qualquer uma das parcelas. As funções foram ranqueadas a partir dos valores do teste Kolmogorov-Smirnov, e decidiu-se que a função Gama é a mais apropriada...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Engenharia Florestal Função densidade de probabilidade; Função Gama; Matéria orgânica do solo Probability density function; Gamma function; Soil organic matter.
Ano: 2017
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/953

Decomposition of Arachis pintoi and Hyparrhenia rufa litters in monoculture and intercropped systems under lowland soil
Provedor de dados: 86
Autores: Oliveira,Christiane Abreu de; Muzzi,Maria Rita Scotti; Purcino,Hortênsia Abrantes; Marriel,Ivanildo Evódio; Sá,Nadja Maria Horta de.
Tropical grasslands under lowland soils are generally underutilized and the litter of forage legumes may be used to recover these degraded pastures. The objective of this work was to study the dynamics of litter decomposition of Arachis pintoi (pinto peanut), Hyparrhenia rufa (thatching grass) and a mixture of both species in a lowland soil. These treatments were analyzed in three areas: grass monoculture, legume monoculture and legume intercropped with the grass during the dry and wet seasons. Litter bags containing the legume, grass or a mixture of both species were incubated to estimate the decomposition rate and microorganism colonization. Decomposition constants (K) and litter half-lives (T1/2) were estimated by an exponential model whereas number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Forage; Microorganisms; Pinto peanuts; Soil organic matter; Thatching grass.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000900010

Soil aggregation according to the dynamics of carbon and nitrogen in soil under different cropping systems
Provedor de dados: 86
Autores: Seben Junior,Getulio de Freitas; Corá,José Eduardo; Lal,Rattan.
Abstract The objective of this work was to evaluate total soil carbon and nitrogen, as well as their contents in particulate and mineral-associated C fractions; to determine C stock and sequestration rates in the soil; and to verify the effect of C and N contents on soil aggregation, using different crop rotations and crop sequences under no-tillage. The study was carried out for nine years in a clayey Oxisol. The treatments consisted of different cropping systems formed by the combination of three summer crops (cropped until March) - corn (Zea mays) monocropping, soybean (Glycine max) monocropping, and soybean/corn rotation - and seven second crops (crop successions). Soil samples were taken at the 0.00-0.10-m layer for physical fractionation of C and N,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbon sequestration; Carbon stocks; Cover crops; Crop rotation; Soil aggregates; Soil organic matter.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000901652

Occasional soil tillage, liming, and nitrogen fertilization on long-term no-tillage system
Provedor de dados: 86
Autores: Yagi,Renato.
Abstract: The objective of this work was to evaluate the residual effects of occasional soil tillage in a 17-year-old, no-tillage system, associated with liming and nitrogen fertilization, on the crop yields and chemical properties of a very clayey Oxisol in the South of Brazil. A randomized complete block design in split-split plots was used, with two soil managements (with or without plowing), two liming treatments (with or without the required dose to raise base saturation to 70%), five N doses applied on side-dress (0, 1, 2, 4, and 6 times the recommended amounts), and four replicates. A rotation system was used with corn and soybean in the summer, and with wheat and black oats in the winter. The residual effects of occasional soil tillage in a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Consolidated no-tillage system; Soil acidity; Soil management; Soil organic matter; Superficial liming; Water deficit.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000700833

Soil quality and soybean productivity in crop-livestock integrated system in no-tillage
Provedor de dados: 86
Autores: Laroca,Jackeline Vieira dos Santos; Souza,Juliana Mendes Andrade de; Pires,Gabriela Castro; Pires,Gleidson José Coutinho; Pacheco,Leandro Pereira; Silva,Francine Damian da; Wruck,Flávio Jesus; Carneiro,Marco Aurélio Carbone; Silva,Laércio Santos; Souza,Edicarlos Damacena de.
Abstract: The objective of this work was to evaluate the quality of the soil and its relation with soybean (Glycine max) yield in an integrated crop-livestock system (ICLS), with intercropping between grasses and legumes in the pasture phase. The experiment was carried out in the state of Mato Grosso, Brazil, on a dystrophic Oxisol, in which grasses (Megathyrsus maximus 'BRS Tamani' and Urochloa brizantha 'BRS Piatã'), intercropped with cowpea (Vigna unguiculata 'BRS Tumucumaque') and pigeon pea (Cajanus cajan 'BRS Mandarim'), were cultivated after soybean harvest. A randomized complete block design was used, with three replicates, in a split-plot arrangement, in which grasses were considered as plots, and legumes as subplots. Legume intercrops provided...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Cowpea; Microbial biomass; Pigeon pea; Soil organic matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001101248

Technical Efficiency of U.S. Organic Farmers: The Complementary Roles of Soil Management Techniques and Farm Experience
Provedor de dados: 31
Autores: Lohr,   Luanne; Park,   Timothy A.
Agricultural policymakers place increasing emphasis on developing efficiency measures for organic producers in order to evaluate regulatory strategies and evolving organic market conditions. We develop technical efficiency measures for U.S. organic farmers using a stochastic production frontier. Farm decisions about acquiring and managing organic soil materials from on-farm and local sources are incorporated into the technical efficiency measure. Productivity differences between newer entrants to organic farming and more experienced producers are estimated in order to isolate the impact of learning and management expertise on farm-level technical efficiency.
Tipo: Journal Article
Palavras-chave: Organic farming; Frontier production function; Soil organic matter; Performance measurement; Technical efficiency; Farm Management.
Ano: 2006
URL: http://purl.umn.edu/10208

The effect of soil quality on fertilizer use rates among smallholder farmers in western Kenya
Provedor de dados: 31
Autores: Marenya,   Paswel Phiri; Barrett,   Christopher B.
Studies of fertilizer use in sub-Saharan Africa have been dominated by analyses of economic and market factors having to do with infrastructure, institutions, and incentives that prevent or foster increased fertilizer demand, largely ignoring how soil fertility status conditions farmer demand for fertilizer. We apply a switching regression model to data from 260 farm households in western Kenya in order to allow for the possibility of discontinuities in fertilizer demand based on a soil carbon content (SCC) threshold. We find that the usual factors reflecting liquidity and quasi-fixed inputs are important on high-SCC plots but not on those with poorer soils. External inputs become less effective on soils with low SCC, hence the discernible shift in...
Tipo: Conference Paper or Presentation
Palavras-chave: Fertilizer demand; Fertilizer policy; Soil carbon; Soil organic matter; Switching regression; Agricultural and Food Policy; Crop Production/Industries; Q12; Q18; Q24.
Ano: 2009
URL: http://purl.umn.edu/51671

Microbiological properties and oxidizable organic carbon fractions of an oxisol under coffee with split phosphorus applications and irrigation regimes
Provedor de dados: 90
Autores: Costa,Adriana Rodolfo da; Sato,Juliana Hiromi; Ramos,Maria Lucrécia Gerosa; Figueiredo,Cícero Célio de; Souza,Géssica Pereira de; Rocha,Omar Cruz; Guerra,Antônio Fernando.
Phosphorus fertilization and irrigation increase coffee production, but little is known about the effect of these practices on soil organic matter and soil microbiota in the Cerrado. The objective of this study was to evaluate the microbiological and oxidizable organic carbon fractions of a dystrophic Red Latossol under coffee and split phosphorus (P) applications and different irrigation regimes. The experiment was arranged in a randomized block design in a 3 x 2 factorial design with three split P applications (P1: 300 kg ha-1 P2O5, recommended for the crop year, of which two thirds were applied in September and the third part in December; P2: 600 kg ha-1 P2O5, applied at planting and then every two years, and P3: 1,800 kg ha-1 P2O5, the requirement for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: P cycling; Soil microbial activity; Acid phosphatase; Soil organic matter.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000100006

DISTRIBUTION OF ORGANIC CARBON IN DIFFERENT SOIL FRACTIONS IN ECOSYSTEMS OF CENTRAL AMAZONIA
Provedor de dados: 90
Autores: Marques,Jean Dalmo de Oliveira; Luizão,Flávio Jesus; Teixeira,Wenceslau Geraldes; Sarrazin,Max; Ferreira,Sávio José Filgueira; Beldini,Troy Patrick; Marques,Elizalane Moura de Araújo.
Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system (AFS). Samples were collected at the depths 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-160, and 160-200 cm. Densimetric and particle size analysis methods were used for FSOM, obtaining the following fractions: FLF (free light fraction), IALF...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fractionation; Soil organic matter; Land use; Soil physical fractions.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100232

Carbon and Nitrogen Stocks and Humic Fractions in Brazilian Organosols
Provedor de dados: 90
Autores: 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

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

Transformations in occluded light fraction organic matter in a clayey oxisol: evidence from 13C-CPMAS-NMR and delta13C Signature
Provedor de dados: 90
Autores: Roscoe,R.; Buurman,P.; van Lagen,B.; Velthorst,E.
We hypothesised that, during occlusion inside granular aggregates of oxide-rich soils, the light fraction organic matter would undergo a strong process of decomposition, either due to the slow process of aggregate formation and stabilisation or due to digestion in the macro- and meso-fauna guts. This process would favour the accumulation of recalcitrant materials inside aggregates. The aim of this study was to compare the dynamics and the chemical composition of free and occluded light fraction organic matter in a natural cerrado vegetation (woodland savannah) and a nearby pasture (Brachiaria spp.) to elucidate the transformations during occlusion of light fraction in aggregates of a clayey Oxisol. Nuclear Magnetic Resonance of the 13C, with Cross...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic matter; Density fractionation; 13C-CPMAS-NMR; 13C/12C isotopic ratio.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832004000500003

Successive Cultivation of Soybean/Corn Intercropped with Urochloa brizantha topdressed with Nitrogen
Provedor de dados: 90
Autores: Fortes,Danilo Gomes; Rosa Junior,Edgard Jardim; Rosa,Yara Brito Chaim Jardim; Souza,Fábio Régis de; Gelain,Evandro.
ABSTRACT Corn intercropped with Urochloa brizantha (Syn, Brachiaria brizantha) has been indicated as a suitable alternative management practice for rational land use in crop-livestock production systems in the Cerrado region of Brazil. An experiment was carried out in Maracaju, MS, Brazil to evaluate the effect of sequences of soybean/second-crop corn systems intercropped with Urochloa brizantha and the effects of forms of nitrogen on soil chemical and physical properties. A randomized block experimental design was used with four replications; treatments were in a 2 × 4 factorial arrangement with two systems of crop management: second-crop corn intercropped with Urochloa brizantha, and monoculture of second crop corn; and four forms of topdressing N: urea,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aggregate stability; Intercropping; Soil organic matter; Topdressing.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100533

ORGANIC CARBON CONTENTS AND STOCKS IN PARTICLE SIZE FRACTIONS OF A TYPIC HAPLUDOX FERTILIZED WITH PIG SLURRY AND SOLUBLE FERTILIZER
Provedor de dados: 90
Autores: Mafra,Maria Sueli Heberle; Cassol,Paulo Cezar; Albuquerque,Jackson Adriano; Grohskopf,Marco André; Andrade,Andreia Patrícia; Rauber,Luiz Paulo; Friederichs,Augusto.
The use of pig slurry (PS) as fertilizer can affect the soil quality and increase total stocks of soil organic carbon (TOC). However, the effects of PS on TOC amount and forms in the soil are not fully understood, particularly in areas under no-tillage (NT). The purpose of this study was to determine TOC contents and stocks in the particulate (POC) and mineral-associated C fractions (MAC) of an Oxisol after nine years of maize-oat rotation under NT, with annual applications of PS, soluble fertilizer and combined fertilization (pig slurry + soluble fertilizer). The experiment was initiated in 2001 in Campos Novos, Santa Catarina, with the following treatments: PS at rates of 0 (without fertilization - PS0); 25 (PS25); 50 (PS50); 100 (PS100); and 200 m3...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manure; Swine slurry; Carbon fixation; Soil organic matter; No-tillage.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000401161

Contribution of Eucalyptus Harvest Residues and Nitrogen Fertilization to Carbon Stabilization in Ultisols of Southern Bahia
Provedor de dados: 90
Autores: Oliveira,Fernanda Cristina Caparelli; Silva,Ivo Ribeiro; Ferreira,Gabriel William Dias; Soares,Emanuelle Mercês Barros; Silva,Sérgio Ricardo; Silva,Eulene Francisco.
ABSTRACT: Eucalyptus forests in southern Bahia (BA) are planted in soils with a sandy surface layer and humid tropical climate, conditions that lead to soil carbon (C) decomposition. Recent studies have shown that nitrogen (N) may be important for soil C stabilization. The aim of this study was to evaluate the contribution of Eucalyptus harvest residues and nitrogen fertilization to C stabilization in Ultisols of southern BA. The experiment was conducted in Eucalyptus clonal plantations cultivated in two regions of Eunápolis, BA, Brazil, with different clay content: southern region (140 g kg-1 of clay) and western region (310 g kg-1 of clay). Five treatments were evaluated: one control (CTR), without Eucalyptus harvest residues and N fertilization, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Planted forests; Harvest residue management; Soil organic matter; Stable isotope.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100501

Spodosols pedogenesis under barreiras formation and sandbank environments in the south of Bahia
Provedor de dados: 90
Autores: Oliveira,Aline Pacobahyba de; Ker,João Carlos; Silva,Ivo Ribeiro da; Fontes,Maurício Paulo Ferreira; Oliveira,Alessandra Pacobahyba de; Neves,Alan Tadeu Goyatá.
Morphologically differentiated Spodosols usually occur in the Coastal Plain of the South of Bahia and North of Espírito Santo. They are found in profiles known as "muçungas", i.e. sandy soils that accumulate water. In these areas, two kinds of Spodosols, different from those in the Restinga area, can be found: Spodosols with E albic horizon (white muçunungas) and without this horizon (black muçunungas). Eight soil profiles with spodic characteristics were collected and described in order to evaluate differences in the formation process of Barreiras and Restinga Spodosols in the South of Bahia. The soil profiles were also characterized chemically, physically and mineralogically. Additionally, texture and chemical analysis, Fe and Al extraction by sodium...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil classification; Soil organic matter; Sand soils; Muçunungas.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000300026

Modeling changes in organic carbon stocks for distinct soils in southeastern brazil after four eucalyptus rotations using the century model
Provedor de dados: 90
Autores: Lima,Augusto Miguel Nascimento; Silva,Ivo Ribeiro da; Stape,Jose Luis; Mendonça,Eduardo Sá; Novais,Roberto Ferreira; Barros,Nairam Félix de; Neves,Júlio César Lima; Paul,Keryn; Schulthais,Fernanda; Polglase,Phill; Raison,John; Soares,Emanuelle Mercês Barros.
Soil organic matter (SOM) plays an important role in carbon (C) cycle and soil quality. Considering the complexity of factors that control SOM cycling and the long time it usually takes to observe changes in SOM stocks, modeling constitutes a very important tool to understand SOM cycling in forest soils. The following hypotheses were tested: (i) soil organic carbon (SOC) stocks would be higher after several rotations of eucalyptus than in low-productivity pastures; (ii) SOC values simulated by the Century model would describe the data better than the mean of observations. So, the aims of the current study were: (i) to evaluate the SOM dynamics using the Century model to simulate the changes of C stocks for two eucalyptus chronosequences in the Rio Doce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic matter; Land use change; Reforestation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300018

Soil carbon and nitrogen in pasture soil reforested with eucalyptus and guachapele
Provedor de dados: 90
Autores: Balieiro,Fabiano de Carvalho; Pereira,Marcos Gervasio; Alves,Bruno José Rodrigues; Resende,Alexander Silva de; Franco,Avílio Antonio.
In spite of the normally low content of organic matter found in sandy soils, it is responsible for almost the totality of cation exchange capacity (CEC), water storage and availability of plant nutrients. It is therefore important to evaluate the impact of alternative forest exploitation on the improvement of soil C and N accumulation on these soils. This study compared pure and mixed plantations of Eucalyptus grandis and Pseudosamanea guachapele, a N2-fixing leguminous tree, in relation to their effects on soil C and N stocks. The studied Planosol area had formerly been covered by Panicum maximum pasture for at least ten years without any fertilizer addition. To estimate C and N contents, the soil was sampled (at depths of 0-2.5; 2.5-5.0; 5.0-7.5;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mixed plantations; Pseudosamanea guachapele; Eucalyptus grandis; Soil organic matter; 13C natural abundance.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000300033

Soil chemical properties related to acidity under successive pig slurry application
Provedor de dados: 90
Autores: Lourenzi,Cledimar Rogério; Ceretta,Carlos Alberto; Silva,Leandro Souza da; Trentin,Gustavo; Girotto,Eduardo; Lorensini,Felipe; Tiecher,Tadeu Luis; Brunetto,Gustavo.
Pig slurry application as soil manure can alter the chemical properties of the soil and affect its acidity, modifying the environment for crop growth and development. The objective of this study was to evaluate the chemical properties related to soil acidity subjected to successive applications of pig slurry. The experiment was conducted in May 2000, in an experimental area of the Federal University of Santa Maria (UFSM) under no-tillage and lasted until January 2008. Nineteen surface applications of 0, 20, 40, and 80 m³ ha-1 of pig slurry were performed, during a period of 100 months and the soil sampled in the end (layers 0-2, 2-4, 4-6, 6-8, 8-10, 10-12, 12-14, 14-16, 16-18, 18-20, 20-25, 25-30, 30-35, 35-40, 40-50 and 50-60 cm). The application of pig...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Water pH; Base saturation; Al saturation; Soil organic matter; Organic waste.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000500037

Changes in Soil Organic Carbon and Nitrogen Stocks in Long-Term Experiments in Southern Brazil Simulated with Century 4.5
Provedor de dados: 90
Autores: 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

CHARACTERIZATION OF HEADWATERS PEATS OF THE RIO ARAÇUAÍ, MINAS GERAIS STATE, BRAZIL
Provedor de dados: 90
Autores: Bispo,Diêgo Faustolo Alves; Silva,Alexandre Christofaro; Christofaro,Cristiano; Silva,Max Leandro Naves; Barbosa,Maurício Soares; Silva,Bárbara Pereira Christofaro; Barral,Uidemar Moraes.
Peatlands are soil environments that accumulate water and organic carbon and function as records of paleo-environmental changes. The variability in the composition of organic matter is reflected in their morphological, physical, and chemical properties. The aim of this study was to characterize these properties in peatlands from the headwaters of the Rio Araçuaí (Araçuaí River) in different stages of preservation. Two cores from peatlands with different vegetation types (moist grassland and semideciduous seasonal forest) from the Rio Preto [Preto River] headwaters (conservation area) and the Córrego Cachoeira dos Borges [Cachoeira dos Borges stream] (disturbed area) were sampled. Both are tributaries of the Rio Araçuaí. Samples were taken from layers of 15...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Histosol; Soil organic matter; Carbon isotopes.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000200475

Redox index of soil carbon stability
Provedor de dados: 90
Autores: Baldotto,Marihus Altoé; Canela,Maria Cristina; Canellas,Luciano Pasqualoto; Dobbs,Leonardo Barros; Velloso,Ary Carlos Xavier.
As an alternative to the relatively complex and expensive spectroscopic methods, the redox properties of humic acids, determined by potentiometric titrations, have been used to evaluate the stability of soil organic C. The objective of the present study was to establish a Redox Index of C Stability (RICS) and to correlate it with some properties of the humic acids extracted from different modal soils in Brazil (distinct weathering stages or management) to facilitate system comparison. The RICS was efficient for soil comparison and variations were comparable to those of the chemical and spectroscopic methods used for humic acid characterization. The values of soil pH, point of zero salt effect, sum of bases, exchangeable Ca content, weathering index, as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil chemistry; Soil organic matter; Humic substances; Oxidation capacity.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000500007

Carbon stocks of an Oxisol after thirty-eight years under different tillage systems
Provedor de dados: 91
Autores: 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

Oxidizable carbon fractions in Red Latosol under different management systems
Provedor de dados: 124
Autores: Guareschi,Roni Fernandes; Pereira,Marcos Gervasio; Perin,Adriano.
The aim of this study was to evaluate the oxidizable fractions of organic C in a Red Latosol in an area of cerrado under a no-tillage system (NT) with different years of implantation, and to compare them to areas of native cerrado and pasture. The experimental design used was completely randomized with five replications. Treatments consisted of five areas: native cerrado (NC) "stricto sensu"; pasture (PA) planted with Brachiaria decumbens; NT with 3 (NT3); NT with 15 (NT15) and NT with 20 (NT20) years of implantation. There was an increase in the ground-surface mass of vegetable residue as a function of the time of implantation of the NT. An increase in C content and the carbon-management index (CMI) can be seen as a function of the time of implantation of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: No-tillage; Grassland; Soil organic matter; Labile carbon.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200005

Soil physical and microbiological attributes cultivated with the common bean under two management systems
Provedor de dados: 124
Autores: Gennaro,Lorena Adriana De; Souza,Zigomar Menezes de; Weill,Mara de Andrade Marinho; Souza,Gustavo Soares de; Alves,Marlene Cristina.
Agricultural management systems can alter the physical and biological soil quality, interfering with crop development. The objective of this study was to evaluate the physical and microbiological attributes of a Red Latosol, and its relationship to the biometric parameters of the common bean (Phaseolus vulgaris), irrigated and grown under two management systems (conventional tillage and direct seeding), in Campinas in the state of São Paulo, Brazil. The experimental design was of randomised blocks, with a split-plot arrangement for the management system and soil depth, analysed during the 2006/7 and 2007/8 harvest seasons, with 4 replications. The soil physical and microbiological attributes were evaluated at depths of 0.00-0.05, 0.05-0.10, 0.10-0.20 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil structure; Soil organic matter; Soil microbial activity; Direct seeding; Phaseolus vulgaris.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400002

Soil Organic Matter in Nano-Composite and Clay Fractions, and Soluble Pools of the Rhizosphere
Provedor de dados: 127
Autores: Monreal,CM; Schnitzer,M.
Tipo: Journal article
Palavras-chave: Soil organic matter; Nano-composite; Clay fraction.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912008000400009

Relationships between labile soil organic carbon fractions under different soil management systems
Provedor de dados: 63
Autores: Souza,Géssica Pereira de; Figueiredo,Cícero Célio de; Sousa,Djalma Martinhão Gomes de.
ABSTRACT The study of labile carbon fractions (LCF) provides an understanding of the behavior of soil organic matter (SOM) under different soil management systems and cover crops. The aim of this study was to assess the effect of different soil management systems with respect to tillage, cover crop and phosphate fertilization on the amount of the LCF of SOM. Treatments consisted of conventional tillage (CT) and no-tillage (NT) with millet as the cover crop and a no-tillage system with velvet bean at two phosphorus dosages. Soil samples were collected and analyzed for organic carbon (OC), C oxidizable by KMnO4 (C-KMnO4), particulate OC (POC), microbial biomass carbon and light SOM in the 0.0-0.05, 0.05-0.10 and 0.10-0.20 m soil layers. The Carbon Management...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Labile organic matter; Soil organic matter; Phosphorus fertilization.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000600535

Carbon stock and humification index of organic matter affected by sugarcane straw and soil management
Provedor de dados: 63
Autores: 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 &lt; 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

Carbon sequestration in clay and silt fractions of Brazilian soils under conventional and no-tillage systems
Provedor de dados: 63
Autores: 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 (&lt;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

Methods of soil organic carbon determination in Brazilian savannah soils
Provedor de dados: 63
Autores: Sato,Juliana Hiromi; Figueiredo,Cícero Célio de; Marchão,Robélio Leandro; Madari,Beáta Emöke; Benedito,Luiz Eduardo Celino; Busato,Jader Galba; Souza,Diego Mendes de.
Several methods exist for determining soil organic carbon, and each one has its own advantages and limitations. Consequently, a comparison of the experimental results obtained when these methods are employed is hampered, causing problems in the comparison of carbon stocks in soils. This study aimed at evaluating the analytical procedures used in the determination of carbon and their relationships with soil mineralogy and texture. Wet combustion methods, including Walkley-Black, Mebius and Colorimetric determination as well as dry combustion methods, such as Elemental and Gravimetric Analysis were used. Quantitative textural and mineralogical (kaolinite, goethite and gibbsite) analyses were also carried out. The wet digestion methods underestimated the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil organic matter; Wet combustion; Dry combustion.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400007

First-order decay models to describe soil C-CO2 Loss after rotary tillage
Provedor de dados: 63
Autores: La Scala Jr.,Newton; Lopes,Afonso; Spokas,Kurt; Archer,David Walter; Reicosky,Donald.
To further understand the impact of tillage on CO2 emission, the applicability of two conceptual models was tested, which describe the CO2 emission after tillage as a function of the non-tilled emission plus a correction due to the tillage disturbance. Models assume that C in readily decomposable organic matter follows a first-order reaction kinetics equation as: dCsoil (t) / dt = -k Csoil (t), and that soil C-CO2 emission is proportional to the C decay rate in soil, where Csoil(t) is the available labile soil C (g m-2) at any time (t) and k is the decay constant (time-1). Two possible assumptions were tested to determine the tilled (F T) fluxes: the decay constants (k) of labile soil C before and after tillage are different (Model 1) or not (Model 2)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil respiration; Soil tillage; Soil organic matter; Labile carbon decay.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500010

Losses and gains of soil organic carbon in grasslands in the Brazilian semi-arid region
Provedor de dados: 63
Autores: Medeiros,Aldair de Souza; Maia,Stoécio Malta Ferreira; Santos,Thiago Cândido dos; Gomes,Tâmara Cláudia de Araújo.
ABSTRACT: Studies show that soil organic carbon (SOC) decreases between 3 % and 9 % in degraded grasslands in tropical regions, mainly due to the absence of techniques to enhance carbon contribution to soils. This study assessed SOC stock change factors for grassland management, specific to the semi-arid region of Brazil. These factors may contribute to a better understanding of SOC dynamics and could be used to improve inventories on GHG emissions. In addition, they could be used for updating default factors used by the Intergovernmental Panel on Climate Change. This study considers both soil sampling and a literature review, and comprises 27 paired comparisons, where the dataset was analyzed using a mixed linear model. For the grassland in the Brazilian...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caatinga; Soil organic matter; Management factors; Degraded grasslands.
Ano: 2021
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000301402

Humic substances and its distribution in coffee crop under cover crops and weed control methods
Provedor de dados: 63
Autores: Martins,Bruno Henrique; Araujo-Junior,Cezar Francisco; Miyazawa,Mario; Vieira,Karen Mayara.
ABSTRACT Humic substances (HS) comprise the passive element in soil organic matter (SOM), and represent one of the soil carbon pools which may be altered by different cover crops and weed control methods. This study aimed to assess HS distribution and characteristics in an experimental coffee crop area subjected to cover crops and cultural, mechanical, and chemical weed control. The study was carried out at Londrina, in the state of Paraná, southern Brazil (23°21’30” S; 51°10’17” W). In 2008, seven weed control/cover crops were established in a randomized block design between two coffee rows as the main-plot factor per plot and soil sampling depths (0-10 cm, 10-20 cm, 20-30 cm and 30-40 cm) as a split-plot. HS were extracted through alkaline and acid...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: UV-Vis spectroscopy; Conservation agriculture; Soil organic matter; Carbon content; Chemical fractionating.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000400371

Classification of soil respiration in areas of sugarcane renewal using decision tree
Provedor de dados: 63
Autores: Farhate,Camila Viana Vieira; Souza,Zigomar Menezes de; Oliveira,Stanley Robson de Medeiros; Carvalho,João Luís Nunes; Scala Júnior,Newton La; Santos,Ana Paula Guimarães.
ABSTRACT: The use of data mining is a promising alternative to predict soil respiration from correlated variables. Our objective was to build a model using variable selection and decision tree induction to predict different levels of soil respiration, taking into account physical, chemical and microbiological variables of soil as well as precipitation in renewal of sugarcane areas. The original dataset was composed of 19 variables (18 independent variables and one dependent (or response) variable). The variable-target refers to soil respiration as the target classification. Due to a large number of variables, a procedure for variable selection was conducted to remove those with low correlation with the variable-target. For that purpose, four approaches of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil CO2 emission; Data mining; Variable selection; Soil temperature; Soil organic matter.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300216

Carbon and nitrogen stocks of an Arenosol under irrigated fruit orchards in semiarid Brazil
Provedor de dados: 63
Autores: 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

Calibration and validation of models for short-term decomposition and N mineralization of plant residues in the tropics
Provedor de dados: 63
Autores: 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

Quantifying soil carbon stocks and greenhouse gas fluxes in the sugarcane agrosystem: point of view
Provedor de dados: 63
Autores: Cerri,Carlos Eduardo Pellegrino; Galdos,Marcelo Valadares; Carvalho,João Luís Nunes; Feigl,Brigitte Josefine; Cerri,Carlos Clemente.
Strategies to mitigate climate change through the use of biofuels (such as ethanol) are associated not only to the increase in the amount of C stored in soils but also to the reduction of GHG emissions to the atmosphere.This report mainly aimed to propose appropriate methodologies for the determinations of soil organic carbon stocks and greenhouse gas fluxes in agricultural phase of the sugarcane production. Therefore, the text is a piece of contribution that may help to obtain data not only on soil carbon stocks but also on greenhouse gas emissions in order to provide an accurate life cycle assessment for the ethanol. Given that the greenhouse gas value is the primary measure of biofuel product quality, biorefiners that can show a higher offset of their...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Soil organic matter; Global warming; Nitrous oxide; Ethanol.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000500011

Tropical agriculture and global warming: impacts and mitigation options
Provedor de dados: 63
Autores: Cerri,Carlos Eduardo P.; Sparovek,Gerd; Bernoux,Martial; Easterling,Willian E.; Melillo,Jerry M.; Cerri,Carlos Clemente.
The intensive land use invariably has several negative effects on the environment and crop production if conservative practices are not adopted. Reduction in soil organic matter (SOM) quantity means gas emission (mainly CO2, CH4, N2O) to the atmosphere and increased global warming. Soil sustainability is also affected, since remaining SOM quality changes. Alterations can be verified, for example, by soil desegregation and changes in structure. The consequences are erosion, reduction in nutrient availability for the plants and lower water retention capacity. These and other factors reflect negatively on crop productivity and sustainability of the soil-plant-atmosphere system. Conversely, adoption of "best management practices", such as conservation tillage,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Climate change; Greenhouse effect; Soil organic matter; Management practices.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000100013

Microbiological attributes of a cultivated Plinthosol with sugarcane on different levels of straw
Provedor de dados: 109
Autores: Torres-Pórtela,Mirya Grazielle; Carvalho-Leite,Luiz Fernando; Pires-Barbosa,Ranyellson.
Abstract The objective of this work was to evaluate the microbiological attributes of a Plinthossol cropped with sugar cane in straw. The experiment was installed in União (04 ° 51’09”S and 42 ° 53’10 ‘’ W, altitude 52 m), northern region of Piauí state, Brazil. The experimental design was randomized blocks, with four replications, and treatments corresponding to different rates of straw (Mg.ha-1) (0, 4.19, 9.54, 13.04 and 18.38). Microbiological attributes were determined at a depth of 0-10 cm. Data was submitted to analysis of variance, cluster analysis and main components. An increase of straw in the soil influenced the stocks and contents of C, Cmic, Nmic, respiration and microbial and metabolic quotients. Cluster analysis combined the treatments into...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microorganisms; Multivariate; Biomass; Saccharum offcinarum; Soil organic matter.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122020000400306

Evolution of soil organic carbon during a chronosequence of transformation from cacao ( Theobroma cacao L.) plantation to grassland
Provedor de dados: 109
Autores: Morales,Pedro Salvador; Sánchez Hernández,Rufo; Sánchez Gómez,Delfino; López Noverola,Ulises; Santiago,Gelacio Alejo; Valdés Velarde,Eduardo; Gallardo Lancho,Juan Fernando.
Abstract The aim of this research was to evaluate the impact of the soil use change of the Cocoa Agroforestry System (CAS) on soil organic carbon (SOC) levels and other indicating soil chemical fertility properties (edaphic density ρ b, cation exchange capacity CEC, soil total nitrogen STN), when a soil use change occurs from CAS to grassland (GL). For this, in order to be selected was recorded, considering different time intervals (1-5, 6-10 y 11-20 years). However, a CAS of 20-35 years was considered as a reference. In addition, soil samples were taken at -30 cm depth to determine the contents of SOC, STN, CEC, ρb, soil organic matter (SOM) and the soil C/N ratio. Consequently, the soil penetration resistance was evaluated in situ. The results indicated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil use change; Edaphic apparent density; Soil fertility; Soil organic matter; Edaphic C/N relationship.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000400525

Estimation of soil organic carbon (SOC) at different soil depths and soil use in the Sumapaz paramo, Cundinamarca - Colombia
Provedor de dados: 109
Autores: Montes-Pulido,Carmen Rosa; Ramos-Miras,José Joaquín; San José -Wery,Ana María.
Abstract The vertical distribution of soil organic carbon (SOC), considered to be a key component of the carbon cycle, is still poorly understood in tropical highest mountain ecosystems such as the Andean paramo. The estimation of the SOC in the presence and absence of anthropic intervention, will help to define policies to mitigate CO2 emissions into the atmosphere from this ecosystem. The aim of this research was to determine soil organic carbon sequestration at three soil depths under two types of soil use in the paramo of Sumapaz, Colombia. The soil variations of pH, phosphorus, aluminum, bulk density, carbon sequestration, cation exchange capacity, texture and to estimate the vertical distribution of soil organic carbon SOC, were evaluated,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Andisols; Root carbon; Soil organic matter; Vertical distribution.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000100095

Litter decomposition and nutrient release dynamics of leaves and roots of the babassu palm in eastern Amazonia
Provedor de dados: 36
Autores: LUZ,Ronildson Lima; LEITE,Márcio Fernandes Alves; ZELARAYÁN,Marcelo Correa; BODDEY,Robert Michael; GEHRING,Christoph.
ABSTRACT The ruderal babassu palm (Attalea speciosa) is expanding on large areas of degraded Amazon landscapes. Decomposition of leaves and roots is in the center of plant:soil interactions. We evaluated decomposition and nutrient concentrations of leaves and fine roots of babassu in comparison with two exotic reference species, Acacia mangium (slow degradability) and Leucaena leucocephala (fast degradability), in a 138-day litterbag assay carried out in secondary forest stands of different age and babassu abundance. We chose 4-mm over 2-mm mesh litterbags based on a pilot study. Babassu leaves degraded slower than leaves of A. mangium and L. leucocephala, and also had lower nitrogen, phosphorus and calcium concentrations in all stages of decomposition. By...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Attalea speciosa; Litter bag; Nutrient concentrations; Ruderal palm; Secondary succession; Soil organic matter.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000300213

Sorption and desorption of diuron in Oxisol under biochar application
Provedor de dados: 53
Autores: Petter,Fabiano André; Ferreira,Tamara Santos; Sinhorin,Adilson Paulo; Lima,Larissa Borges de; Morais,Leidimar Alves de; Pacheco,Leandro Pereira.
ABSTRACT The objective of this study was to verify the kinetics of sorption and desorption of diuron in an Oxisol under application of biochar. The samples were collected in a field experiment conducted in randomized design blocks consisted of 2 base fertilization levels (0 and 400 kg∙ha−1 NPK 00-20-20 fertilizer formula) and 3 doses of biochar (0, 8 and 16 Mg∙ha−1). In the evaluation of sorption and desorption, Batch Equilibrium method was used. The kinetics of sorption and desorption of diuron, total organic carbon, fulvic acid, humic acid and humin, pH and partition coefficient to organic carbon were evaluated. The Freundlich isotherm was adjusted appropriately to describe diuron sorption kinetics in all the studied treatments. The application of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaching; Persistence; Soil organic matter; Herbicide; Pyrogenic carbon.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000400487

Carbon stocks in organic matter fractions as affected by land use and soil management, with emphasis on no-tillage effect
Provedor de dados: 65
Autores: 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

Correcting field determination of elemental contents in soils via portable X-ray fluorescence spectrometry
Provedor de dados: 64
Autores: Dijair,Thaís Santos Branco; Silva,Fernanda Magno; Teixeira,Anita Fernanda dos Santos; Silva,Sérgio Henrique Godinho; Guilherme,Luiz Roberto Guimarães; Curi,Nilton.
ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been useful worldwide for determining soil elemental content under both field and laboratory conditions. However, the field results are influenced by several factors, including soil moisture (M), soil texture (T) and soil organic matter (SOM). Thus, the objective of this work was to create linear mathematical models for conversion of Al2O3, CaO, Fe, K2O, SiO2, V, Ti and Zr contents obtained by pXRF directly in field to those obtained under laboratory conditions, i.e., in air-dried fine earth (ADFE), using M, T and SOM as auxiliary variables, since they influence pXRF results. pXRF analyses in field were performed on 12 soil profiles with different parent materials. From them, 59 samples were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: PXRF; Soil moisture; Soil texture; Soil organic matter; Prediction models.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100211