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Registro Completo |
Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Pantanal. |
Data corrente: |
15/02/1995 |
Data da última atualização: |
27/06/1995 |
Autoria: |
ELLIOTT, E. T.; PALM, C. A.; REUSS, D. E.; MONZ, C. A. |
Título: |
Organic matter contained in soil aggregates from a tropical chronosequence: correction for sand and light fraction. |
Ano de publicação: |
1991 |
Fonte/Imprenta: |
Agric. Ecosyst. Environ., v.34, p.443-451, 1991. |
Idioma: |
Inglês |
Conteúdo: |
A cultivation sequence of Ultisols (sandy loam) from the Amazon Basin of Peru was physically fractionate using wet sieving followed by heavy liquid separation and total organic C and N analysis. Soils were sampled to an equivalent plow depth (22.5) in a cultivation chronosequence containing the following treatments: an old growth forest (75 plus years) a 13-year fallowed forest, a 3-year continuous cultivation corn-soybean rotation following a 10-year forest fallow and a 16-year intensively managed corn field. The soil was air dried and re-wetted (misted) to field capacity before shaking for 10 min and wet sieving into five size classes: <0.02, 0.02-0.05, 0.05-0.212, 0.212-1.0 and >1.0 mm. The weight of soil, total organic C and N and percent sand was determined on each size class. Subsamples of each size class were gently stirred in sodium metatungstate (specific gravity=1.8), left overnight and the floating material removed by aspiration. The removed material was filtered through pre-ashed glass fiber filters and analyzed for total organic C and N. The sand content of size classes ranged from 45 to 95%. Light fraction C comprised 24, 28, 14, 5 and 2% of the total C of the size classes ranging from the largest to smalles particle sizes. Total C concentrations were highest in the largest and smallest particle size classes. Within any size class, all treatment had similar C concentration except for the <0.02-mm particles where the 75-year forest has lower concentrations. When corrected for sand content (i.e., expressed on a silt plus clay basis) and with light fraction C subtrated, the organic C content was, with few exceptions, not different among size classes or treatments. However, when all treatments whitin a size class were averaged, the 0.020-0.053-mm class had a higer concentration of C. MenosA cultivation sequence of Ultisols (sandy loam) from the Amazon Basin of Peru was physically fractionate using wet sieving followed by heavy liquid separation and total organic C and N analysis. Soils were sampled to an equivalent plow depth (22.5) in a cultivation chronosequence containing the following treatments: an old growth forest (75 plus years) a 13-year fallowed forest, a 3-year continuous cultivation corn-soybean rotation following a 10-year forest fallow and a 16-year intensively managed corn field. The soil was air dried and re-wetted (misted) to field capacity before shaking for 10 min and wet sieving into five size classes: <0.02, 0.02-0.05, 0.05-0.212, 0.212-1.0 and >1.0 mm. The weight of soil, total organic C and N and percent sand was determined on each size class. Subsamples of each size class were gently stirred in sodium metatungstate (specific gravity=1.8), left overnight and the floating material removed by aspiration. The removed material was filtered through pre-ashed glass fiber filters and analyzed for total organic C and N. The sand content of size classes ranged from 45 to 95%. Light fraction C comprised 24, 28, 14, 5 and 2% of the total C of the size classes ranging from the largest to smalles particle sizes. Total C concentrations were highest in the largest and smallest particle size classes. Within any size class, all treatment had similar C concentration except for the <0.02-mm particles where the 75-year forest has lower concentrations. When... Mostrar Tudo |
Thesagro: |
Carbono; Matéria Orgânica; Nitrogênio; Solo. |
Thesaurus Nal: |
organic matter; soil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02463naa a2200229 a 4500 001 1614724 005 1995-06-27 008 1991 bl --- 0-- u #d 100 1 $aELLIOTT, E. T. 245 $aOrganic matter contained in soil aggregates from a tropical chronosequence$bcorrection for sand and light fraction. 260 $c1991 520 $aA cultivation sequence of Ultisols (sandy loam) from the Amazon Basin of Peru was physically fractionate using wet sieving followed by heavy liquid separation and total organic C and N analysis. Soils were sampled to an equivalent plow depth (22.5) in a cultivation chronosequence containing the following treatments: an old growth forest (75 plus years) a 13-year fallowed forest, a 3-year continuous cultivation corn-soybean rotation following a 10-year forest fallow and a 16-year intensively managed corn field. The soil was air dried and re-wetted (misted) to field capacity before shaking for 10 min and wet sieving into five size classes: <0.02, 0.02-0.05, 0.05-0.212, 0.212-1.0 and >1.0 mm. The weight of soil, total organic C and N and percent sand was determined on each size class. Subsamples of each size class were gently stirred in sodium metatungstate (specific gravity=1.8), left overnight and the floating material removed by aspiration. The removed material was filtered through pre-ashed glass fiber filters and analyzed for total organic C and N. The sand content of size classes ranged from 45 to 95%. Light fraction C comprised 24, 28, 14, 5 and 2% of the total C of the size classes ranging from the largest to smalles particle sizes. Total C concentrations were highest in the largest and smallest particle size classes. Within any size class, all treatment had similar C concentration except for the <0.02-mm particles where the 75-year forest has lower concentrations. When corrected for sand content (i.e., expressed on a silt plus clay basis) and with light fraction C subtrated, the organic C content was, with few exceptions, not different among size classes or treatments. However, when all treatments whitin a size class were averaged, the 0.020-0.053-mm class had a higer concentration of C. 650 $aorganic matter 650 $asoil 650 $aCarbono 650 $aMatéria Orgânica 650 $aNitrogênio 650 $aSolo 700 1 $aPALM, C. A. 700 1 $aREUSS, D. E. 700 1 $aMONZ, C. A. 773 $tAgric. Ecosyst. Environ.$gv.34, p.443-451, 1991.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
15/01/2014 |
Data da última atualização: |
12/03/2024 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
FONSECA, L. M. G.; NOBRE, M. M.; ROCHA, D. T. da; FERNANDES, E. N.; MORAIS, L. S. DE. |
Afiliação: |
LEONARDO MARIANO GRAVINA FONSECA, CNPGL; MYRIAM MAIA NOBRE, CNPGL; DENIS TEIXEIRA DA ROCHA, CNPGL; ELIZABETH NOGUEIRA FERNANDES, CNPGL; LUCIANA SOARES DE MORAIS, UFJF. |
Título: |
Utilização da plataforma Ning para o desenvolvimento de rede social temática para o agronegócio do leite. |
Ano de publicação: |
2013 |
Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE AGROINFORMÁTICA, 9., 2013, Cuiabá. Agroinformática: inovação para a sustentabilidade do agronegócio brasileiro: anais. Cuiabá: Universidade Federal de Mato Grosso, 2013. |
Idioma: |
Português |
Palavras-Chave: |
Cadeia produtiva do leite; Redes sociais temáticas; RepiLeite. |
Thesagro: |
Transferência de Tecnologia. |
Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/976139/1/Utilizacao-da-plataforma-Ning.pdf
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Marc: |
LEADER 00806nam a2200193 a 4500 001 1976139 005 2024-03-12 008 2013 bl uuuu u00u1 u #d 100 1 $aFONSECA, L. M. G. 245 $aUtilização da plataforma Ning para o desenvolvimento de rede social temática para o agronegócio do leite.$h[electronic resource] 260 $aIn: CONGRESSO BRASILEIRO DE AGROINFORMÁTICA, 9., 2013, Cuiabá. Agroinformática: inovação para a sustentabilidade do agronegócio brasileiro: anais. Cuiabá: Universidade Federal de Mato Grosso$c2013 650 $aTransferência de Tecnologia 653 $aCadeia produtiva do leite 653 $aRedes sociais temáticas 653 $aRepiLeite 700 1 $aNOBRE, M. M. 700 1 $aROCHA, D. T. da 700 1 $aFERNANDES, E. N. 700 1 $aMORAIS, L. S. DE
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