Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Rev. Bras. Ciênc. Solo (2) BJM (1) PAB (1) Autor Arf,Orivaldo (1) Barros,Nairam Félix de (1) Cantanhêde,Ilka South de Lima (1) Cassiolato,Ana Maria Rodrigues (1) Cobucci,Tarcísio (1) França,Aldi Fernandes de Souza (1) Machado,Pedro Luiz Oliveira de Almeida (1) Madari,Beata Emöke (1) Muniz,Luciano Cavalcante (1) Nahas,Ely (1) Silva,Ivo Ribeiro da (1) Silva,Mariana Pina da (1) Silva,Sérgio Ricardo (1) Souza,Marcelo Fernando Pereira (1) Sá Mendonça,Eduardo de (1) Tavares,Rose Luiza Moraes (1) Trovo,José Benedito de Freitas (1) Mais... Palavra-chave Microbial biomass carbon (4) Carbon mineralization (1) Cerrado (1) Cover plants (1) Humification (1) Metabolic quotient (1) Microbial activity (1) Microbial quotient (1) Net N mineralization (1) Organic matter (1) Potential nitrification (1) Respiratory activity (1) Soil bulk density (1) Soil respiration (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2014 (1) 2013 (1) 2011 (2) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Humic fractions of forest, pasture and maize crop soils resulting from microbial activity BJM Tavares,Rose Luiza Moraes; Nahas,Ely. Humic substances result from the degradation of biopolymers of organic residues in the soil due to microbial activity. The objective of this study was to evaluate the influence of three different ecosystems: forest, pasture and maize crop on the formation of soil humic substances relating to their biological and chemical attributes. Microbial biomass carbon (MBC), microbial respiratory activity, nitrification potential, total organic carbon, soluble carbon, humic and fulvic acid fractions and the rate and degree of humification were determined. Organic carbon and soluble carbon contents decreased in the order: forest > pasture > maize; humic and fulvic acids decreased in the order forest > pasture=maize. The MBC and respiratory activity were not... Tipo: Info:eu-repo/semantics/article Palavras-chave: Humification; Microbial biomass carbon; Potential nitrification; Respiratory activity. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000300028 Soil biological attributes in pastures of different ages in a crop-livestock integrated system PAB Muniz,Luciano Cavalcante; Madari,Beata Emöke; Trovo,José Benedito de Freitas; Cantanhêde,Ilka South de Lima; Machado,Pedro Luiz Oliveira de Almeida; Cobucci,Tarcísio; França,Aldi Fernandes de Souza. The objective of this work was to evaluate the effect of the pasture (Urochloa brizantha) component age on soil biological properties, in a crop-livestock integrated system. The experiment was carried out in a Brazilian savannah (Cerrado) area with 92 ha, divided into six pens of approximately 15 ha. Each pen represented a different stage of the pasture component: formation, P0; one year, P1; two years, P2; three years, P3; and final with 3.5 years, Pf. Samples were taken in the 0-10 cm soil depth. The soil biological parameters - microbial biomass carbon (MBC), microbial biomass respiration (C-CO2), metabolic quotient (qCO2), microbial quotient (q mic), and total organic carbon (TOC) - were evaluated and compared among different stages of the pasture, and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Metabolic quotient; Microbial biomass carbon; Microbial quotient; Soil respiration. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011001000021 Chemical and biological properties of phosphorus-fertilized soil under legume and grass cover (Cerrado region, Brazil) Rev. Bras. Ciênc. Solo Souza,Marcelo Fernando Pereira; Silva,Mariana Pina da; Arf,Orivaldo; Cassiolato,Ana Maria Rodrigues. The use of cover crops has been suggested as an effective method to maintain and/or increase the organic matter content, while maintaining and/or enhancing the soil physical, chemical and biological properties. The fertility of Cerrado soils is low and, consequently, phosphorus levels as well. Phosphorus is required at every metabolic stage of the plant, as it plays a role in the processes of protein and energy synthesis and influences the photosynthetic process. This study evaluated the influence of cover crops and phosphorus rates on soil chemical and biological properties after two consecutive years of common bean. The study analyzed an Oxisol in Selvíria (Mato Grosso do Sul, Brazil), in a randomized block, split plot design, in a total of 24 treatments... Tipo: Info:eu-repo/semantics/article Palavras-chave: Microbial biomass carbon; Microbial activity; Organic matter; Cover plants; Cerrado. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600006 Effect of compaction on microbial activity and carbon and nitrogen transformations in two oxisols with different mineralogy Rev. Bras. Ciênc. Solo Silva,Sérgio Ricardo; Silva,Ivo Ribeiro da; Barros,Nairam Félix de; Sá Mendonça,Eduardo de. The use of machinery in agricultural and forest management activities frequently increases soil compaction, resulting in greater soil density and microporosity, which in turn reduces hydraulic conductivity and O2 and CO2 diffusion rates, among other negative effects. Thus, soil compaction has the potential to affect soil microbial activity and the processes involved in organic matter decomposition and nutrient cycling. This study was carried out under controlled conditions to evaluate the effect of soil compaction on microbial activity and carbon (C) and nitrogen (N) mineralization. Two Oxisols with different mineralogy were utilized: a clayey oxidic-gibbsitic Typic Acrustox and a clayey kaolinitic Xantic Haplustox (Latossolo Vermelho-Amarelo ácrico - LVA,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil bulk density; Carbon mineralization; Net N mineralization; Microbial biomass carbon. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400007 Registros recuperados: 4 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco