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Registro Completo |
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Biblioteca(s): |
Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Rondônia; Embrapa Semiárido; Embrapa Unidades Centrais. |
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Data corrente: |
28/08/1997 |
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Data da última atualização: |
29/08/2013 |
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Tipo da produção científica: |
Comunicado Técnico/Recomendações Técnicas |
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Autoria: |
SÁ SOBRINHO, A. F. de; CARVALHO, O. S. |
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Afiliação: |
UEPAE de Manaus; CNPA. |
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Título: |
Estudo da época de semeadura da cultura de milho em área de várzea no Estado do Amazonas. |
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Ano de publicação: |
1981 |
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Fonte/Imprenta: |
Manaus: EMBRAPA-UEPAE de Manaus, 1981. |
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Páginas: |
2 p. |
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Série: |
(EMBRAPA-UEPAE de Manaus. Comunicado Técnico, 19). |
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Idioma: |
Português |
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Conteúdo: |
O principal objetivo desse trabalho foi a determinação da época mais propícia de semeadura, visando proporcionar aos agricultores do Estado maiores produções. Os trabalhos foram realizados em solos classificados de "Gley Pouco Húmico". |
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Palavras-Chave: |
Amazonas; Brasil; Flooded land; Maize. |
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Thesagro: |
Época de Semeadura; Milho; Semeadura; Várzea. |
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Thesaurus Nal: |
Amazonia; Corn; sowing date. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/59316/1/comunicado-tecnico-19.pdf
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Marc: |
LEADER 00985nam a2200277 a 4500
001 1672764
005 2013-08-29
008 1981 bl uuuu u0uu1 u #d
100 1 $aSÁ SOBRINHO, A. F. de
245 $aEstudo da época de semeadura da cultura de milho em área de várzea no Estado do Amazonas.
260 $aManaus: EMBRAPA-UEPAE de Manaus$c1981
300 $a2 p.
490 $a(EMBRAPA-UEPAE de Manaus. Comunicado Técnico, 19).
520 $aO principal objetivo desse trabalho foi a determinação da época mais propícia de semeadura, visando proporcionar aos agricultores do Estado maiores produções. Os trabalhos foram realizados em solos classificados de "Gley Pouco Húmico".
650 $aAmazonia
650 $aCorn
650 $asowing date
650 $aÉpoca de Semeadura
650 $aMilho
650 $aSemeadura
650 $aVárzea
653 $aAmazonas
653 $aBrasil
653 $aFlooded land
653 $aMaize
700 1 $aCARVALHO, O. S.
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Registro original: |
Embrapa Amazônia Ocidental (CPAA) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
25/08/1997 |
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Data da última atualização: |
25/08/1997 |
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Autoria: |
SANO, E. E. |
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Título: |
Sensitivity analysis of C- and Ku- band synthetic aperture radar data to soil moisture content in a semiarid region. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
[Tucson]: University of Arizona, 1997. |
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Páginas: |
122p. |
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Idioma: |
Inglês |
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Notas: |
Ph-D. Thesis. |
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Conteúdo: |
In this study, the sensitivity of the C-band (5.3 GHz) with a 23 incidence angle and the Ku-band (14.85 GHz) with 35, 55, and 75 incidence angles to surface soil moisture content from a semiarid region were evaluated. To obtain an improved soil moisture estimation, a practical technique to reduce the influence of soil roughness and vegetation in the SAR data was developed in a study area located in the Walnut Gulch Experimental Watershed, a representative site of shrub- and grass-dominated rangelands of the southwestern part of the United States. To correct for soil roughness effects, the C-band radar backscattering coefficients 0 from a wet season image were substracted from 0 derived from a dry season was dependent only on the soil roughness effects. To coorrect for soil roughness effects, the C-band radar backscattering coefficients o from a wet season imagem were subtrated from o derived from a dry season image. The assumption was that, in semiarid regions, the SAR data from the dry season was dependent only on the soil roughness effects. To correct for vegetation effects, an empirical relation between and leaf area index was used, the latter derived from Landsat Thematic Mapper data. The results showed that when both soil roughness and vegetation effects were corrected for, the sensitivity of o to soil moisture improved substantially. The sensitivity of o to soil moisture was also evaluated in agricultural fields with bare soil and periodic roughness components (planting row and furrow structures). Four types of SAR system configurations were analyzed: C-band with a 23 incidence angle and Ku-ban with 35, 55, and 75 incidence angles. The test sites were located at the University of Arizona's Maricopa Agricultural Center, south of Phoenix, Arizona. The results showed that the sensitivity of o to soil moisture was strongly dependent upon the field conditions. The SAR signals were nearly insensitive to soil moisture for furrowed fields (furrow spacing ~ 95 cm; amplitude ~ 22 cm), but for fields with planting row structure (row spacing ~ 24 cm; amplitude ~ 2cm), the SAR data were sensitive to soil moisture, particularly with the C-band at a ?23 incidence angle and the Ku-band with a 35 incidence angle, regardless of the arow direction. MenosIn this study, the sensitivity of the C-band (5.3 GHz) with a 23 incidence angle and the Ku-band (14.85 GHz) with 35, 55, and 75 incidence angles to surface soil moisture content from a semiarid region were evaluated. To obtain an improved soil moisture estimation, a practical technique to reduce the influence of soil roughness and vegetation in the SAR data was developed in a study area located in the Walnut Gulch Experimental Watershed, a representative site of shrub- and grass-dominated rangelands of the southwestern part of the United States. To correct for soil roughness effects, the C-band radar backscattering coefficients 0 from a wet season image were substracted from 0 derived from a dry season was dependent only on the soil roughness effects. To coorrect for soil roughness effects, the C-band radar backscattering coefficients o from a wet season imagem were subtrated from o derived from a dry season image. The assumption was that, in semiarid regions, the SAR data from the dry season was dependent only on the soil roughness effects. To correct for vegetation effects, an empirical relation between and leaf area index was used, the latter derived from Landsat Thematic Mapper data. The results showed that when both soil roughness and vegetation effects were corrected for, the sensitivity of o to soil moisture improved substantially. The sensitivity of o to soil moisture was also evaluated in agricultural fields with bare soil and periodic roughness components (plantin... Mostrar Tudo |
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Palavras-Chave: |
Zona semi arida. |
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Thesagro: |
Sensoriamento Remoto; Umidade do Solo. |
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Thesaurus NAL: |
remote sensing; semiarid zones; soil water content. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02879nam a2200205 a 4500
001 1557028
005 1997-08-25
008 1997 bl uuuu m 00u1 u #d
100 1 $aSANO, E. E.
245 $aSensitivity analysis of C- and Ku- band synthetic aperture radar data to soil moisture content in a semiarid region.
260 $a[Tucson]: University of Arizona$c1997
300 $a122p.
500 $aPh-D. Thesis.
520 $aIn this study, the sensitivity of the C-band (5.3 GHz) with a 23 incidence angle and the Ku-band (14.85 GHz) with 35, 55, and 75 incidence angles to surface soil moisture content from a semiarid region were evaluated. To obtain an improved soil moisture estimation, a practical technique to reduce the influence of soil roughness and vegetation in the SAR data was developed in a study area located in the Walnut Gulch Experimental Watershed, a representative site of shrub- and grass-dominated rangelands of the southwestern part of the United States. To correct for soil roughness effects, the C-band radar backscattering coefficients 0 from a wet season image were substracted from 0 derived from a dry season was dependent only on the soil roughness effects. To coorrect for soil roughness effects, the C-band radar backscattering coefficients o from a wet season imagem were subtrated from o derived from a dry season image. The assumption was that, in semiarid regions, the SAR data from the dry season was dependent only on the soil roughness effects. To correct for vegetation effects, an empirical relation between and leaf area index was used, the latter derived from Landsat Thematic Mapper data. The results showed that when both soil roughness and vegetation effects were corrected for, the sensitivity of o to soil moisture improved substantially. The sensitivity of o to soil moisture was also evaluated in agricultural fields with bare soil and periodic roughness components (planting row and furrow structures). Four types of SAR system configurations were analyzed: C-band with a 23 incidence angle and Ku-ban with 35, 55, and 75 incidence angles. The test sites were located at the University of Arizona's Maricopa Agricultural Center, south of Phoenix, Arizona. The results showed that the sensitivity of o to soil moisture was strongly dependent upon the field conditions. The SAR signals were nearly insensitive to soil moisture for furrowed fields (furrow spacing ~ 95 cm; amplitude ~ 22 cm), but for fields with planting row structure (row spacing ~ 24 cm; amplitude ~ 2cm), the SAR data were sensitive to soil moisture, particularly with the C-band at a ?23 incidence angle and the Ku-band with a 35 incidence angle, regardless of the arow direction.
650 $aremote sensing
650 $asemiarid zones
650 $asoil water content
650 $aSensoriamento Remoto
650 $aUmidade do Solo
653 $aZona semi arida
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