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Registro Completo |
Biblioteca(s): |
Embrapa Amazônia Ocidental. |
Data corrente: |
22/08/2000 |
Data da última atualização: |
22/08/2000 |
Autoria: |
BARROS, E. da R.; SABOURIN, E.; PERE, J. I. G.; CARON, P. |
Título: |
Desenvolvimento local e associacoes de pequenos agricultores - o caso de Massaroca (Juazeiro-BA). |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Petrolina: Embrapa Semi-Arido, 1999. |
Páginas: |
28p. |
Série: |
(Embrapa Semi-Arido. Documentos, 127). |
ISSN: |
1516-1633 |
Idioma: |
Português |
Conteúdo: |
Informacoes tecnicas sobre metodos e instrumentos de P&D com as comunidades da reguai de Massaroca (Juazeiro-BA-Brasil). |
Palavras-Chave: |
Bahia; Brasil; Jazeiro. |
Thesagro: |
Agricultor; Desenvolvimento Socio-Econômico; Pequeno Produtor. |
Thesaurus Nal: |
small farms; socioeconomic development. |
Categoria do assunto: |
-- |
Marc: |
LEADER 00894nam a2200277 a 4500 001 1669611 005 2000-08-22 008 1999 bl uuuu u0uu1 u #d 022 $a1516-1633 100 1 $aBARROS, E. da R. 245 $aDesenvolvimento local e associacoes de pequenos agricultores - o caso de Massaroca (Juazeiro-BA). 260 $aPetrolina: Embrapa Semi-Arido$c1999 300 $a28p. 490 $a(Embrapa Semi-Arido. Documentos, 127). 520 $aInformacoes tecnicas sobre metodos e instrumentos de P&D com as comunidades da reguai de Massaroca (Juazeiro-BA-Brasil). 650 $asmall farms 650 $asocioeconomic development 650 $aAgricultor 650 $aDesenvolvimento Socio-Econômico 650 $aPequeno Produtor 653 $aBahia 653 $aBrasil 653 $aJazeiro 700 1 $aSABOURIN, E. 700 1 $aPERE, J. I. G. 700 1 $aCARON, P.
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Registro Completo
Biblioteca(s): |
Embrapa Cerrados. |
Data corrente: |
25/03/2002 |
Data da última atualização: |
25/03/2002 |
Autoria: |
POST, D. F.; FIMBRES, A.; MATTHIAS, A. D.; SANO, E. E.; ACCIOLY, L.; BATCHILY, A. K.; FERREIRA, L. G. |
Título: |
Prediciting soil albedo from soil color and spectral reflectance data. |
Ano de publicação: |
2000 |
Fonte/Imprenta: |
Soil Science Society of America Journal, Madison, v. 64, n. 3, p. 1027-1034, 2000. |
Idioma: |
Inglês |
Conteúdo: |
The albedo of earthsurface features, such as soil, is na important component of models that define land-surface meteorological processes. If land surfaces have no vegetative cover, soil properties determine the amount of solar radiation absorbed or reflected. We evaluated the influence of two soil properties, soil color and soil moisture, on soil albedo. Two soil moisture conditions were studied, air dry and wet, defined as the condition when the water films are absorbed by the soil and no water glistens on the soil surface. The albedos for 26 U.S. soils were measured with na Eppley pyranometer, which integrates radiant energy in wavelengths between 0.3 to 2.8 um. Soil colors were measured with a Minolta Chroma Meter and spectral reflectance curves from 0.45 to 0.9 um (measured in 0.1-um increments) were determined with a multispectral radiometer. All measurements were made on maior 2-mm smooth soil surfaces, and the dry and wet data were combined for statistical analyses. Soil albedos were significantly correlated with Munsell soil color value (r2=0.93), blue (r2=0.82), green (r2=0.90), red (r2=0.93), near infrared (NIR), (r2= 0.95), and sum of the four bands (r2= 0.94); however, the slopes and intercepts for these relationships were different. The 52 spectral curves yielded nine cluster groups, which mostly related to the Munsell soil color value and soil albedo soil characteristics. The 0.3-to 2.8-um albedos of smoothed soils can be accurately estimated using the regression relationship: soil albedo (0.3-2.8um) = 0.069 (color value) - 0.114. Using the regression equations presented here, spectral reflectance data in selected visible and NIR bands can also be used to predict albedo. MenosThe albedo of earthsurface features, such as soil, is na important component of models that define land-surface meteorological processes. If land surfaces have no vegetative cover, soil properties determine the amount of solar radiation absorbed or reflected. We evaluated the influence of two soil properties, soil color and soil moisture, on soil albedo. Two soil moisture conditions were studied, air dry and wet, defined as the condition when the water films are absorbed by the soil and no water glistens on the soil surface. The albedos for 26 U.S. soils were measured with na Eppley pyranometer, which integrates radiant energy in wavelengths between 0.3 to 2.8 um. Soil colors were measured with a Minolta Chroma Meter and spectral reflectance curves from 0.45 to 0.9 um (measured in 0.1-um increments) were determined with a multispectral radiometer. All measurements were made on maior 2-mm smooth soil surfaces, and the dry and wet data were combined for statistical analyses. Soil albedos were significantly correlated with Munsell soil color value (r2=0.93), blue (r2=0.82), green (r2=0.90), red (r2=0.93), near infrared (NIR), (r2= 0.95), and sum of the four bands (r2= 0.94); however, the slopes and intercepts for these relationships were different. The 52 spectral curves yielded nine cluster groups, which mostly related to the Munsell soil color value and soil albedo soil characteristics. The 0.3-to 2.8-um albedos of smoothed soils can be accurately estimated using the regressi... Mostrar Tudo |
Palavras-Chave: |
Refletancia. |
Thesagro: |
Solo. |
Thesaurus NAL: |
reflectance; soil. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02365naa a2200241 a 4500 001 1564558 005 2002-03-25 008 2000 bl --- 0-- u #d 100 1 $aPOST, D. F. 245 $aPrediciting soil albedo from soil color and spectral reflectance data. 260 $c2000 520 $aThe albedo of earthsurface features, such as soil, is na important component of models that define land-surface meteorological processes. If land surfaces have no vegetative cover, soil properties determine the amount of solar radiation absorbed or reflected. We evaluated the influence of two soil properties, soil color and soil moisture, on soil albedo. Two soil moisture conditions were studied, air dry and wet, defined as the condition when the water films are absorbed by the soil and no water glistens on the soil surface. The albedos for 26 U.S. soils were measured with na Eppley pyranometer, which integrates radiant energy in wavelengths between 0.3 to 2.8 um. Soil colors were measured with a Minolta Chroma Meter and spectral reflectance curves from 0.45 to 0.9 um (measured in 0.1-um increments) were determined with a multispectral radiometer. All measurements were made on maior 2-mm smooth soil surfaces, and the dry and wet data were combined for statistical analyses. Soil albedos were significantly correlated with Munsell soil color value (r2=0.93), blue (r2=0.82), green (r2=0.90), red (r2=0.93), near infrared (NIR), (r2= 0.95), and sum of the four bands (r2= 0.94); however, the slopes and intercepts for these relationships were different. The 52 spectral curves yielded nine cluster groups, which mostly related to the Munsell soil color value and soil albedo soil characteristics. The 0.3-to 2.8-um albedos of smoothed soils can be accurately estimated using the regression relationship: soil albedo (0.3-2.8um) = 0.069 (color value) - 0.114. Using the regression equations presented here, spectral reflectance data in selected visible and NIR bands can also be used to predict albedo. 650 $areflectance 650 $asoil 650 $aSolo 653 $aRefletancia 700 1 $aFIMBRES, A. 700 1 $aMATTHIAS, A. D. 700 1 $aSANO, E. E. 700 1 $aACCIOLY, L. 700 1 $aBATCHILY, A. K. 700 1 $aFERREIRA, L. G. 773 $tSoil Science Society of America Journal, Madison$gv. 64, n. 3, p. 1027-1034, 2000.
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