| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Solos; Embrapa Solos / UEP-Recife. |
|
Data corrente: |
28/08/2023 |
|
Data da última atualização: |
06/12/2023 |
|
Tipo da produção científica: |
Boletim de Pesquisa e Desenvolvimento |
|
Autoria: |
NASCIMENTO, C. W. R. do; CEDDIA, M. B.; VASQUES, G. M.; RODRIGUES, H. M.; MARTINS, S. S.; OLIVEIRA, R. P. de; TAVARES, S. R. de L. |
|
Afiliação: |
CARLOS WAGNER RODRIGUES DO NASCIMENTO, UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO; MARCOS BACIS CEDDIA, UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO; GUSTAVO DE MATTOS VASQUES, CNPS; HUGO MACHADO RODRIGUES, UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO; SAULO SIQUEIRA MARTINS, UNIVERSIDADE FEDERAL DO PARÁ; RONALDO PEREIRA DE OLIVEIRA, CNPS; SILVIO ROBERTO DE LUCENA TAVARES, CNPS. |
|
Título: |
Identifying soil horizons transitions for ground-truthing and interpreting ground penetrating radar (GPR) imagery of Planosols. |
|
Ano de publicação: |
2023 |
|
Fonte/Imprenta: |
Rio de Janeiro: Embrapa Solos, 2023. |
|
Descrição Física: |
E-book. |
|
Série: |
(Embrapa Solos. Boletim de pesquisa e desenvolvimento, 285). |
|
ISSN: |
1678-0892 |
|
Idioma: |
Inglês |
|
Conteúdo: |
The Ground Penetrating Radar (GPR) has potential to characterize soils both vertically and horizontally. The effectiveness of using GPR relies on the interpretation of soil targets in the radargrams. For identifying the targets in their correct depths, a velocity model of the terrain is required. However, a velocity model cannot be directly obtained from GPR models using a monostatic antenna. An alternative is the generation of a depth model by measuring the velocity of the electromagnetic pulse from hyperbolas created in the radargram from the interaction of the pulse with point scatterers. On the other hand, the radargram does not always present these point scatterers for the estimation of the pulse velocity and generation of an accurate depth model. Thus, this work aimed to assess the feasibility of using iron rods as markers of the depths of soil horizons transitions in GPR images (750 MHz antenna) of Planosols, and as point scatterers to generate hyperbolas for deriving depth models for converting the Y-axis of the radargram from time to depth units. The experimental area is located in Seropédica municipality, southeastern Brazil. Three soil profiles were described and classified as Planosols, which were located at the footslope position. Iron rods (80-cm long by 8-mm in diameter) were inserted horizontally in the transitions of the soil horizons. Images (radargrams) were obtained using a GPR with a monostatic shielded antenna of 750 MHz frequency. The radargrams were pre-processed using static correction and dewow to remove noise. The pulse velocity was estimated by fitting the hyperbolas generated by the buried iron rods. As results, the 750 MHz antenna allowed visualizing the iron rods features (hyperbolas), especially in sandier horizons in the radargrams. Pulse velocity estimation was possible, which allowed the time-to-depth conversion of the Y-axis, and thus, positioning vertically the horizons transitions in the radargrams. In Planosols, the vertical and horizontal distribution of the E-to-B horizon transitions, as imaged by the GPR, is important information for irrigation planning, land zoning and soil survey. MenosThe Ground Penetrating Radar (GPR) has potential to characterize soils both vertically and horizontally. The effectiveness of using GPR relies on the interpretation of soil targets in the radargrams. For identifying the targets in their correct depths, a velocity model of the terrain is required. However, a velocity model cannot be directly obtained from GPR models using a monostatic antenna. An alternative is the generation of a depth model by measuring the velocity of the electromagnetic pulse from hyperbolas created in the radargram from the interaction of the pulse with point scatterers. On the other hand, the radargram does not always present these point scatterers for the estimation of the pulse velocity and generation of an accurate depth model. Thus, this work aimed to assess the feasibility of using iron rods as markers of the depths of soil horizons transitions in GPR images (750 MHz antenna) of Planosols, and as point scatterers to generate hyperbolas for deriving depth models for converting the Y-axis of the radargram from time to depth units. The experimental area is located in Seropédica municipality, southeastern Brazil. Three soil profiles were described and classified as Planosols, which were located at the footslope position. Iron rods (80-cm long by 8-mm in diameter) were inserted horizontally in the transitions of the soil horizons. Images (radargrams) were obtained using a GPR with a monostatic shielded antenna of 750 MHz frequency. The radargrams were p... Mostrar Tudo |
|
Palavras-Chave: |
Dielectric constant; Exploration geophysics; Iron rods; Poximal soil sensing; Sensoriamento proximal do solo. |
|
Thesagro: |
Horizonte; Solo. |
|
Thesaurus Nal: |
Soil horizons. |
|
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1156146/1/CNPS-BPD-285-2023.epub
|
|
Marc: |
LEADER 03146nam a2200313 a 4500
001 2156146
005 2023-12-06
008 2023 bl uuuu u0uu1 u #d
022 $a1678-0892
100 1 $aNASCIMENTO, C. W. R. do
245 $aIdentifying soil horizons transitions for ground-truthing and interpreting ground penetrating radar (GPR) imagery of Planosols.$h[electronic resource]
260 $aRio de Janeiro: Embrapa Solos$c2023
300 $cE-book.
490 $a(Embrapa Solos. Boletim de pesquisa e desenvolvimento, 285).
520 $aThe Ground Penetrating Radar (GPR) has potential to characterize soils both vertically and horizontally. The effectiveness of using GPR relies on the interpretation of soil targets in the radargrams. For identifying the targets in their correct depths, a velocity model of the terrain is required. However, a velocity model cannot be directly obtained from GPR models using a monostatic antenna. An alternative is the generation of a depth model by measuring the velocity of the electromagnetic pulse from hyperbolas created in the radargram from the interaction of the pulse with point scatterers. On the other hand, the radargram does not always present these point scatterers for the estimation of the pulse velocity and generation of an accurate depth model. Thus, this work aimed to assess the feasibility of using iron rods as markers of the depths of soil horizons transitions in GPR images (750 MHz antenna) of Planosols, and as point scatterers to generate hyperbolas for deriving depth models for converting the Y-axis of the radargram from time to depth units. The experimental area is located in Seropédica municipality, southeastern Brazil. Three soil profiles were described and classified as Planosols, which were located at the footslope position. Iron rods (80-cm long by 8-mm in diameter) were inserted horizontally in the transitions of the soil horizons. Images (radargrams) were obtained using a GPR with a monostatic shielded antenna of 750 MHz frequency. The radargrams were pre-processed using static correction and dewow to remove noise. The pulse velocity was estimated by fitting the hyperbolas generated by the buried iron rods. As results, the 750 MHz antenna allowed visualizing the iron rods features (hyperbolas), especially in sandier horizons in the radargrams. Pulse velocity estimation was possible, which allowed the time-to-depth conversion of the Y-axis, and thus, positioning vertically the horizons transitions in the radargrams. In Planosols, the vertical and horizontal distribution of the E-to-B horizon transitions, as imaged by the GPR, is important information for irrigation planning, land zoning and soil survey.
650 $aSoil horizons
650 $aHorizonte
650 $aSolo
653 $aDielectric constant
653 $aExploration geophysics
653 $aIron rods
653 $aPoximal soil sensing
653 $aSensoriamento proximal do solo
700 1 $aCEDDIA, M. B.
700 1 $aVASQUES, G. M.
700 1 $aRODRIGUES, H. M.
700 1 $aMARTINS, S. S.
700 1 $aOLIVEIRA, R. P. de
700 1 $aTAVARES, S. R. de L.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Solos (CNPS) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Unidades Centrais. |
|
Data corrente: |
19/10/2006 |
|
Data da última atualização: |
27/07/2018 |
|
Autoria: |
MORAIS, H.; CARAMORI, P. H.; RIBEIRO, A. M. de A.; GOMES, J. C.; KOGUISHI, M. S. |
|
Afiliação: |
Heverly Morais, Instituto Agronômico do Paraná - IAPAR; Paulo Henrique Caramori, Instituto Agronômico do Paraná - IAPAR; Ana Maria de Arruda Ribeiro, Instituto Agronômico do Paraná - IAPAR; José Carlos Gomes, Instituto Agronômico do Paraná - IAPAR; Mirian Sei Koguishi, Instituto Agronômico do Paraná - IAPAR. |
|
Título: |
Microclimatic characterization and productivity of coffee plants grown under shade of pigeon pea in Southern Brazil. |
|
Ano de publicação: |
2006 |
|
Fonte/Imprenta: |
Pesquisa Agropecuária Brasileira, Brasília, DF, v. 41, n. 5, p. 763-770, maio 2006 |
|
Idioma: |
Inglês |
|
Notas: |
Título em português: Caracterização microclimática e produtividade de cafeeiros sombreados com guandu no Sul do Brasil. |
|
Conteúdo: |
Recent studies on coffee (Coffea arabica L.) cultivation in agroforestry systems in Southern Brazil have shown the potential of partial shading to improve management of this crop. The objective of this work was to evaluate microclimatic conditions and their effects on coffee production of plants shaded with pigeon pea (Cajanus cajan) in comparison to unshaded ones, from May 2001 to August 2002 in Londrina, State of Paraná, Brazil. The appraised microclimatic characteristics were: global radiation, photosynthetic and radiation balance; air, leaf and soil temperatures; and soil humidity. Shading caused significant reduction in incident global solar radiation, photosynthetically active radiation and net radiation, and attenuated maximum leaf, air and soil temperatures, during the day. Shade also reduced the rate of cooling of night air and leaf temperatures, especially during nights with radiative frost. Soil moisture at 0-10 cm depth was higher under shade. The shaded coffee plants produced larger cherries due to slower maturation, resulting in larger bean size. Nevertheless, plants under shade emitted less plagiotropic branches, with smaller number of nodes per branch, and fewer nodes with fruits, resulting in a large reduction in coffee production. These results show the need to find an optimal tree density and management that do not compromise coffee production and protect against extreme temperatures. |
|
Palavras-Chave: |
coffee production; frost protection; produção de cafeeiros; proteção contra geada. |
|
Thesagro: |
Cajanus Cajan; Coffea Arábica; Sombreamento. |
|
Thesaurus NAL: |
photosynthetically active radiation; shade. |
|
Categoria do assunto: |
-- |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/107213/1/Microclimatic.pdf
|
|
Marc: |
LEADER 02431naa a2200289 a 4500
001 1118953
005 2018-07-27
008 2006 bl uuuu u00u1 u #d
100 1 $aMORAIS, H.
245 $aMicroclimatic characterization and productivity of coffee plants grown under shade of pigeon pea in Southern Brazil.
260 $c2006
500 $aTítulo em português: Caracterização microclimática e produtividade de cafeeiros sombreados com guandu no Sul do Brasil.
520 $aRecent studies on coffee (Coffea arabica L.) cultivation in agroforestry systems in Southern Brazil have shown the potential of partial shading to improve management of this crop. The objective of this work was to evaluate microclimatic conditions and their effects on coffee production of plants shaded with pigeon pea (Cajanus cajan) in comparison to unshaded ones, from May 2001 to August 2002 in Londrina, State of Paraná, Brazil. The appraised microclimatic characteristics were: global radiation, photosynthetic and radiation balance; air, leaf and soil temperatures; and soil humidity. Shading caused significant reduction in incident global solar radiation, photosynthetically active radiation and net radiation, and attenuated maximum leaf, air and soil temperatures, during the day. Shade also reduced the rate of cooling of night air and leaf temperatures, especially during nights with radiative frost. Soil moisture at 0-10 cm depth was higher under shade. The shaded coffee plants produced larger cherries due to slower maturation, resulting in larger bean size. Nevertheless, plants under shade emitted less plagiotropic branches, with smaller number of nodes per branch, and fewer nodes with fruits, resulting in a large reduction in coffee production. These results show the need to find an optimal tree density and management that do not compromise coffee production and protect against extreme temperatures.
650 $aphotosynthetically active radiation
650 $ashade
650 $aCajanus Cajan
650 $aCoffea Arábica
650 $aSombreamento
653 $acoffee production
653 $afrost protection
653 $aprodução de cafeeiros
653 $aproteção contra geada
700 1 $aCARAMORI, P. H.
700 1 $aRIBEIRO, A. M. de A.
700 1 $aGOMES, J. C.
700 1 $aKOGUISHI, M. S.
773 $tPesquisa Agropecuária Brasileira, Brasília, DF$gv. 41, n. 5, p. 763-770, maio 2006
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Unidades Centrais (AI-SEDE) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
