| |
|
|
 | Acesso ao texto completo restrito à biblioteca da Embrapa Arroz e Feijão. Para informações adicionais entre em contato com cnpaf.biblioteca@embrapa.br. |
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Arroz e Feijão. |
|
Data corrente: |
30/01/2006 |
|
Data da última atualização: |
14/05/2022 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
VOLLAND-TUDURI, N.; BRUAND, A.; BROSSARD, M.; BALBINO, L. C.; OLIVEIRA, M. I. L. de; MARTINS, E. de S. |
|
Afiliação: |
NATHALIE VOLLAND-TUDURI; ARY BRUAND; MICHEL BROSSARD; LUIZ CARLOS BALBINO, CNPAF; MARIA INES LOPES DE OLIVEIRA; EDER DE SOUZA MARTINS. |
|
Título: |
Mass proportion of microaggregates and bulk density in a Brazilian clayey Oxisol. |
|
Ano de publicação: |
2005 |
|
Fonte/Imprenta: |
Soil Science Society of America Journal, v. 69, n. 5, p.1559-1564, Sept./Oct. 2005. |
|
Idioma: |
Inglês |
|
Conteúdo: |
The physical properties of Brazilian Oxisols are closely related to the development of their microstructure, which typically consists of stable microaggregates >1 mm. There is no model available to predict changes in microstructure in Oxisols. The objective of this work was to relate the proportion of microaggregates to the bulk density (Db) in the soil studied. Five sites of a typic Haplustox under native forest vegetation (two sites) and pasture (three sites) in Rio de Janeiro were sampled. Soil bulk density, sand, silt, and clay content and aggregate-size distribution were measured from the surface to 1.6 m deep in increments of 0.1 m. Thin sections were prepared from undisturbed samples collected in duplicate from 0- to 0.1-, 0.3- to 0.4-, 0.8- to 0.9-, and 1.5- to 1.6-m depths, and backscattered electron scanning images (BESI) were generated. Clay content ranged from 672 to 798 g kg-1 and bulk density between 0.87 and 1.18 g cm-3 among the 80 samples studied. Bulk density was poorly correlated with clay content (R2=0.358) and at any depth was not significantly smaller under native forest vegetation than under pasture. Visual assessment of BESI revealed that soil material corresponded to either microaggregates (<0.1 mm) in loose arrangement or to much larger aggregates. Quantification of BESI from the deepest sampling depth of all soils showed that 96.2 and 95.7% of microaggregates were <0.8 mm with 73.2 and 95.7% between 0.1 and 0.5 mm under native forest vegetation and pasture, respectively. The mass proportion of microaggregates can be estimated using the <0.84-mm soil material that is obtained by dry sieving ( Phi <0.84). Finally, our results showed that Phi <0.84 varied with Db. Linear regression coefficients were calculated for the relationship between Phi <0.84 and the reciprocal of bulk density (1/Db) [ Phi <0.84=1.97 (1/Db) - 1.52, R2=0.82], assuming no interaction between microaggregates and macro aggregates, the porosity of these two structural types was estimated as 0.71 and 0.51, respectively. MenosThe physical properties of Brazilian Oxisols are closely related to the development of their microstructure, which typically consists of stable microaggregates >1 mm. There is no model available to predict changes in microstructure in Oxisols. The objective of this work was to relate the proportion of microaggregates to the bulk density (Db) in the soil studied. Five sites of a typic Haplustox under native forest vegetation (two sites) and pasture (three sites) in Rio de Janeiro were sampled. Soil bulk density, sand, silt, and clay content and aggregate-size distribution were measured from the surface to 1.6 m deep in increments of 0.1 m. Thin sections were prepared from undisturbed samples collected in duplicate from 0- to 0.1-, 0.3- to 0.4-, 0.8- to 0.9-, and 1.5- to 1.6-m depths, and backscattered electron scanning images (BESI) were generated. Clay content ranged from 672 to 798 g kg-1 and bulk density between 0.87 and 1.18 g cm-3 among the 80 samples studied. Bulk density was poorly correlated with clay content (R2=0.358) and at any depth was not significantly smaller under native forest vegetation than under pasture. Visual assessment of BESI revealed that soil material corresponded to either microaggregates (<0.1 mm) in loose arrangement or to much larger aggregates. Quantification of BESI from the deepest sampling depth of all soils showed that 96.2 and 95.7% of microaggregates were <0.8 mm with 73.2 and 95.7% between 0.1 and 0.5 mm under native forest vegetation and... Mostrar Tudo |
|
Thesagro: |
Cerrado; Solo. |
|
Thesaurus Nal: |
bulk density; clay fraction; forest soils; grassland soils; image analysis; microaggregates; Oxisols; particle size distribution; sand fraction; silt fraction; soil density; soil physical properties; soil structure; soil types. |
|
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
Marc: |
LEADER 03119naa a2200373 a 4500
001 1213861
005 2022-05-14
008 2005 bl uuuu u00u1 u #d
100 1 $aVOLLAND-TUDURI, N.
245 $aMass proportion of microaggregates and bulk density in a Brazilian clayey Oxisol.$h[electronic resource]
260 $c2005
520 $aThe physical properties of Brazilian Oxisols are closely related to the development of their microstructure, which typically consists of stable microaggregates >1 mm. There is no model available to predict changes in microstructure in Oxisols. The objective of this work was to relate the proportion of microaggregates to the bulk density (Db) in the soil studied. Five sites of a typic Haplustox under native forest vegetation (two sites) and pasture (three sites) in Rio de Janeiro were sampled. Soil bulk density, sand, silt, and clay content and aggregate-size distribution were measured from the surface to 1.6 m deep in increments of 0.1 m. Thin sections were prepared from undisturbed samples collected in duplicate from 0- to 0.1-, 0.3- to 0.4-, 0.8- to 0.9-, and 1.5- to 1.6-m depths, and backscattered electron scanning images (BESI) were generated. Clay content ranged from 672 to 798 g kg-1 and bulk density between 0.87 and 1.18 g cm-3 among the 80 samples studied. Bulk density was poorly correlated with clay content (R2=0.358) and at any depth was not significantly smaller under native forest vegetation than under pasture. Visual assessment of BESI revealed that soil material corresponded to either microaggregates (<0.1 mm) in loose arrangement or to much larger aggregates. Quantification of BESI from the deepest sampling depth of all soils showed that 96.2 and 95.7% of microaggregates were <0.8 mm with 73.2 and 95.7% between 0.1 and 0.5 mm under native forest vegetation and pasture, respectively. The mass proportion of microaggregates can be estimated using the <0.84-mm soil material that is obtained by dry sieving ( Phi <0.84). Finally, our results showed that Phi <0.84 varied with Db. Linear regression coefficients were calculated for the relationship between Phi <0.84 and the reciprocal of bulk density (1/Db) [ Phi <0.84=1.97 (1/Db) - 1.52, R2=0.82], assuming no interaction between microaggregates and macro aggregates, the porosity of these two structural types was estimated as 0.71 and 0.51, respectively.
650 $abulk density
650 $aclay fraction
650 $aforest soils
650 $agrassland soils
650 $aimage analysis
650 $amicroaggregates
650 $aOxisols
650 $aparticle size distribution
650 $asand fraction
650 $asilt fraction
650 $asoil density
650 $asoil physical properties
650 $asoil structure
650 $asoil types
650 $aCerrado
650 $aSolo
700 1 $aBRUAND, A.
700 1 $aBROSSARD, M.
700 1 $aBALBINO, L. C.
700 1 $aOLIVEIRA, M. I. L. de
700 1 $aMARTINS, E. de S.
773 $tSoil Science Society of America Journal$gv. 69, n. 5, p.1559-1564, Sept./Oct. 2005.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Arroz e Feijão (CNPAF) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Acesso ao texto completo restrito à biblioteca da Embrapa Trigo. Para informações adicionais entre em contato com cnpt.biblioteca@embrapa.br. |
Registro Completo
|
Biblioteca(s): |
Embrapa Trigo. |
|
Data corrente: |
18/05/2023 |
|
Data da última atualização: |
18/05/2023 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
C - 0 |
|
Autoria: |
MACIEL, J. L. N.; SILVA, D. da; DEUNER, C. C. |
|
Afiliação: |
JOAO LEODATO NUNES MACIEL, CNPT; DANIELA DA SILVA, Universidade de Passo Fundo; CAROLINA CARDOSO DEUNER, Universidade de Passo Fundo. |
|
Título: |
Em todo o sistema. |
|
Ano de publicação: |
2023 |
|
Fonte/Imprenta: |
Cultivar Grandes Culturas, ano 23, n. 288, p. 20-23, maio 2023. |
|
Idioma: |
Português |
|
Conteúdo: |
Os fungicidas diferem em relação ao grau de sistemicidade; alguns conseguem movimentar-se no interior ou na superfície das plantas com maior facilidade; em geral, quanto maior for a sistemicidade, melhor o potencial de controle da doença fúngica |
|
Palavras-Chave: |
Brusone do trigo; Defensivos agrícolas. |
|
Thesagro: |
Brusone; Fungicida; Trigo. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 00783naa a2200205 a 4500
001 2153811
005 2023-05-18
008 2023 bl uuuu u00u1 u #d
100 1 $aMACIEL, J. L. N.
245 $aEm todo o sistema.$h[electronic resource]
260 $c2023
520 $aOs fungicidas diferem em relação ao grau de sistemicidade; alguns conseguem movimentar-se no interior ou na superfície das plantas com maior facilidade; em geral, quanto maior for a sistemicidade, melhor o potencial de controle da doença fúngica
650 $aBrusone
650 $aFungicida
650 $aTrigo
653 $aBrusone do trigo
653 $aDefensivos agrícolas
700 1 $aSILVA, D. da
700 1 $aDEUNER, C. C.
773 $tCultivar Grandes Culturas, ano 23$gn. 288, p. 20-23, maio 2023.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Trigo (CNPT) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
