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A case study of ship track formation in a polluted marine boundary layer OMA
Noone, K.J.; Johnson, D.W.; Taylor, J.P.; Ferek, R.J.; Garrett, T.; Hobbs, P.V.; Durkee, P.A.; Nielsen, K.; Öström, E.; O'Dowd, C.; Smith, M.H.; Russell, L.M.; Flagan, R.C.; Seinfeld, J.H.; De Bock, L.; Van Grieken, R.; Hudson, J.G.; Brooks, I.; Gasparovic, R.F.; Pockalny, R.A..
A case study of the effects of ship emissions on the microphysical, radiative, and chemical properties of polluted marine boundary layer clouds is presented. Two ship tracks are discussed in detail. <i>In situ</i> measurements of cloud drop size distributions, liquid water content, and cloud radiative properties, as well as aerosol size distributions (outside-cloud, interstitial, and cloud droplet residual particles) and aerosol chemistry, are presented. These are related to remotely sensed measurements of cloud radiative properties. The authors examine the processes behind ship track formation in a polluted marine boundary layer as an example of the effects of anthropogenic particulate pollution on the albedo of marine stratiform clouds.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aerosols; Air pollution; Albedo; Atmosphere; Atmosphere; Atmospheric boundary layer; Boundary layers; Cloud cover; Clouds; Man-induced effects; Marine environment; Marine pollution; Particulates; Remote sensing; Ships.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=8839
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A close look at above ground biomass of a large and heterogeneous Seasonally Dry Tropical Forest - Caatinga in North East of Brazil Anais da ABC (AABC)
CASTANHO,ANDREA D.A.; COE,MICHAEL; ANDRADE,EUNICE M.; WALKER,WAYNE; BACCINI,ALESSANDRO; CAMPOS,DIEGO A.; FARINA,MARY.
Abstract This work is focused on characterizing and understanding the aboveground biomass of Caatinga in a semiarid region in northeastern Brazil. The quantification of Caatinga biomass is limited by the small number of field plots, which are inadequate for addressing the biome’s extreme heterogeneity. Satellite-derived biomass products can address spatial and temporal changes but they have not been validated for seasonally dry tropical forests. Here we combine a compilation of published field phytosociological observations with a new 30m spatial resolution satellite biomass product. Both data were significantly correlated, satellite estimates consistently captured the wide variability of the biomass across the different physiognomies (2-272 Mg/ha). Based...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Above ground biomass; Caatinga; Physiognomy; Remote sensing; Seasonally dry tropical forest; Semiarid.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652020000100604
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A comparison between sea-surface temperature-measurements from satellite noaa4 and from airborne radiometer aries ArchiMer
Albuisson, M; Pontier, L; Wald, L.
Measurements of sea surface temperatures (Sst) in the Gulf of Lions, obtained by the satellite "Noaa 4" sensor Vhrr and by the airborne radiometer "Aries", are presented and compared. The results reveal the reliability of the Vhrr data in the range 16-20. SOC, the degree of accuracy being within O. 5°C of the relative temperatures, despite a malfunctionning of the "Noaa 4" Vhrr.
Tipo: Text Palavras-chave: Températures de surface; Télédétection; Sea surface temperatures; Remote sensing.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00323/43432/43082.pdf
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A comparison for a multiscale study of structural lineaments in southern Brazil: LANDSAT-7 ETM+ and shaded relief images from SRTM3-DEM Anais da ABC (AABC)
Jacques,Patricia D.; Machado,Romulo; Nummer,Alexis R..
This paper presents a comparison of descriptive statistics obtained for brittle structural lineaments extracted manually from LANDSAT images and shaded relief images from SRTM 3 DEM at 1:100, 000 and 1:500, 000 scales. The selected area is located in the southern of Brazil and comprises Precambrian rocks and stratigraphic units of the Paraná Basin. The application of this methodology shows that the visual interpretation depends on the kind of remote sensing image. The resulting descriptive statistics obtained for lineaments extracted from the images do not follow the same pattern according to the scale adopted. The main direction obtained for Proterozoic rocks using both image types at a 1:500, 000 scale are close to NS±10, whereas at a 1:100, 000 scale...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Landsat images; Remote sensing; SRTM; Santa Catarina; Statistics; Structural lineaments.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400008
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A MEASUREMENT SYSTEM BASED ON LiDAR TECHNOLOGY TO CHARACTERIZE THE CANOPY OF SUGARCANE PLANTS REA
Canata,Tatiana F.; Molin,José P.; Sousa,Rafael V. de.
ABSTRACT Laser sensor applications associated with LiDAR (Light Detection and Ranging) technology on platforms allow the evaluation of crop and forest biomass in a non-invasive way. This study presents the development of a measurement system based on LiDAR technology aimed at the proposed assessment of the height of sugarcane plants during the pre-harvest period. A laser sensor, a GNSS (Global Navigation Satellite System) receiver, and an inertial unit compose the measurement system. The equipment was integrated with a computer for data acquisition and installed on an agricultural tractor platform. The GNSS receiver with a real-time kinematic signal was synchronized to the laser sensor to obtain the point cloud and to the inertial unit to evaluate the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy geometry; Instrumentation; Laser sensor; Remote sensing.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000200240
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A missão MOMS da nave Colúmbia. Infoteca-e
MANTOVANI, L. E..
Este teste espacial e o primeiro de uma serie de uso civil que utiliza uma concepção de imageamento optoeletrônica onde as imagens são obtidas através da separação óptica de diferentes bandas do espectro eletromagnético visível.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Teledetecção.; Sensoriamento remoto; Satélite.; Remote sensing; Landsat..
Ano: 1984 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/991565
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A MODEL OF ENTRY-EXIT DECISIONS AND CAPACITY CHOICE UNDER DEMAND UNCERTAINTY AgEcon
Isik, Murat; Coble, Keith H.; Hudson, Darren; House, Lisa.
Many investment decisions of agribusiness firms such as when to invest in an emerging market or whether to expand the capacity of the firm involve irreversible investment and uncertainty about demand, cost or competition. This paper uses an option-value model to examine the factors affecting an agribusiness firm's decision whether and how much to invest in an emerging market under demand uncertainty. Demand uncertainty and irreversibility of investment make investment less desirable than the net present value (NPV) rule indicates. The inactive firm is more reluctant to enter the market when it takes into account demand uncertainty because it preserves the opportunity of making a better investment later. The active firm is more reluctant to abandon the...
Tipo: Conference Paper or Presentation Palavras-chave: Agribusiness decision-making; Demand uncertainty; Entry-exit decisions; Net present value; Real options; Remote sensing; Demand and Price Analysis.
Ano: 2002 URL: http://purl.umn.edu/19797
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A Multivariate Regression Approach to Adjust AATSR Sea Surface Temperature to In Situ Measurements ArchiMer
Tandeo, Pierre; Autret, Emmanuelle; Piolle, Jean-francois; Tournadre, Jean; Ailliot, Pierre.
The Advanced Along-Track Scanning Radiometer (AATSR) onboard Envisat is designed to provide very accurate measurements of sea surface temperature (SST). Using colocated in situ drifting buoys, a dynamical matchup database (MDB) is used to assess the AATSR-derived SST products more precisely. SST biases are then computed. Currently, Medspiration AATSR SST biases are discrete values and can introduce artificial discontinuities in AATSR level-2 SST fields. The new AATSR SST biases presented in this letter are continuous. They are computed, for nighttime and best proximity confidence data, by linear regression with different MDB covariables (wind speed, latitude, aerosol optical depth, etc.). As found, the difference between dual-view and nadir-only SST...
Tipo: Text Palavras-chave: Validation; Sea surface temperature (SST); Remote sensing; Advanced Along Track Scanning Radiometer (AATSR).
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6135.pdf
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A SEARCH FOR CORRELATIONS BETWEEN SEA SURFACE TEMPERATURES AND OPTICAL REFLECTANCES IN CHILE AND BRAZIL DERIVED FROM AVHRR/NOAA IMAGES Gayana
Gusso,Aníbal; Ducati,Jorge Ricardo; Cotlier,Carlos G; Lopez,Diego A. G.
A search is made for indicators of the presence of phytoplankton, using satellite images of the Pacific (Central Chile) and Atlantic (South Brazil). AVHRR/NOAA-16 and -17 visible (1 and 2) and thermal (4 and 5) channels were used to perform a detection test, respectively, the Suspended Particulate Matter (SPM) and the Sea Surface Temperature (SST). In Brazilian waters, a positive correlation is found between SST and SPM's reflectance. This is interpreted as due to phytoplankton being more abundant in colder waters, where nutrients availability are higher because CO2 dissolution rates, thus being a favorable environment for phytoplankton contents, which when mixed with SPM, tends to reduce the total water reflectance, since organic matter causes absorption...
Tipo: Journal article Palavras-chave: Phytoplankton biomass; Remote sensing; AVHRR/NOAA.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200046
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A Statistical Algorithm for Estimating Chlorophyll Concentration in the New Caledonian Lagoon ArchiMer
Wattelez, Guillaume; Dupouy, Cecile; Mangeas, Morgan; Lefevre, Jerome; Touraivane,; Frouin, Robert.
Spatial and temporal dynamics of phytoplankton biomass and water turbidity can provide crucial information about the function, health and vulnerability of lagoon ecosystems (coral reefs, sea grasses, etc.). A statistical algorithm is proposed to estimate chlorophyll-a concentration ([chl-a]) in optically complex waters of the New Caledonian lagoon from MODIS-derived remote-sensing reflectance (R-rs). The algorithm is developed via supervised learning on match-ups gathered from 2002 to 2010. The best performance is obtained by combining two models, selected according to the ratio of R-rs in spectral bands centered on 488 and 555 nm: a log-linear model for low [chl-a] (AFLC) and a support vector machine (SVM) model or a classic model (OC3) for high [chl-a]....
Tipo: Text Palavras-chave: Chlorophyll-a concentration; MODerate resolution Imaging Spectroradiometer (MODIS); Ocean color; Remote sensing; Statistical algorithm; Oligotrophic waters; New Caledonia; Coral lagoon.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00481/59309/62060.pdf
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Agricultura de precisão para a sustentabilidade de sistemas produtivos do agronegócio brasileiro. Infoteca-e
INAMASU, R. Y.; BERNARDI, A. C. de C.; VAZ, C. M. P.; NAIME, J. de M.; QUEIROS, L. R.; RESENDE, A. V. de; VILELA, M. de F.; JORGE, L. A. de C.; BASSOI, L. H.; PEREZ, N. B.; FRAGALLE, E. P..
O início da agricultura de precisão (AP) teve foco em máquinas dotadas de receptores GPS (Global Positioning System) e mapas de produtividade. Talvez, devido à essa fase, estabeleceu-se no Brasil, um senso comum de que o tema AP é uma área do conhecimento relacionada à sofisticação das máquinas agrícolas por meio de eletrônicas embarcadas e sistemas computacionais complexos, apesar do impacto final objetivar a sustentabilidade do agronegócio. A comunidade acadêmica, por sua vez, priorizou trabalhos iniciais voltados ao desenvolvimento de máquinas e equipamentos, por entender que ali estavam os principais desafios.
Tipo: Capítulo em livro técnico (INFOTECA-E) Palavras-chave: Agricultura de Precisão; Sensoriamento Remoto; Precision agriculture; Remote sensing.
Ano: 2011 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/908112
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Agricultural land use and cover change in the Cerrado/Amazon ecotone: A case study of the upper Teles Pires River basin Acta Amazonica
ZAIATZ,Ana Paula Sousa Rodrigues; ZOLIN,Cornélio Alberto; VENDRUSCULO,Laurimar Goncalves; LOPES,Tarcio Rocha; PAULINO,Janaina.
ABSTRACT The upper Teles Pires River basin is a key hydrological resource for the state of Mato Grosso, but has suffered rapid land use and cover change. The basin includes areas of Cerrado biome, as well as transitional areas between the Amazon and Cerrado vegetation types, with intensive large-scale agriculture widely-spread throughout the region. The objective of this study was to explore the spatial and temporal dynamics of land use and cover change from 1986 to 2014 in the upper Teles Pires basin using remote sensing and GIS techniques. TM (Thematic Mapper) and TIRS (Thermal Infrared Sensor) sensor images aboard the Landsat 5 and Landsat 8, respectively, were employed for supervised classification using the “Classification Workflow” in ENVI 5.0. To...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon Basin; Remote sensing; GIS; Territorial management.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672018000200168
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Agronomic performance of white oats cultivated under fertigation with treated sewage effluent and definition of critical limits of Normalized Difference Vegetation Index Bragantia
Coelho,Anderson Prates; Faria,Rogério Teixeira de; Barbosa,Aline Michelle da Silva; Dalri,Alexandre Barcellos; Rosalen,David Luciano.
ABSTRACT One of the benefits of irrigation with wastewater in agriculture is the reduction in the use of mineral fertilizers and the increase in crop yield. For wastewater application, the use of remote sensing can help to define specific management areas. The aim of this study was to evaluate the yield and the growth of irrigated white oats (Avena sativa L.) with varying treated sewage effluent (TSE) levels. These attributes were then correlated with Normalized Difference Vegetation Index (NDVI) values obtained at four phenological stages of the crop and used to define critical limits of NDVI. The experiment consisted of five TSE treatments differing in irrigation depths (11, 31, 60, 87, and 100%). Mean NDVI values in the crop were determined with an...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avena sativa L.; Biomass; Modeling; NDVI; Remote sensing.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000400553
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Alcances y limitaciones de la información espectral multi-angular para la clasificación de la vegetación Colegio de Postgraduados
Cano González, Alejandro de Jesús.
El uso de información espectral multi-angular se ha justificado como una estrategia para aumentar la precisión de los sistemas de clasificación de cultivos y vegetación natural. En este trabajo se discuten los esquemas de caracterización de la información espectral multi-angular asociada a la vegetación, así como su uso en los sistemas de clasificación. Los resultados mostraron que, dejando fijo el fondo de la vegetación, es posible discriminar sistemas arbolados y, cuando el fondo de la vegetación varía, existe confusión con coberturas aéreas bajas. Por lo tanto, se planteo un segundo experimento, presentando un modelo de los efectos del ángulo cenital de visión e iluminación en las reflectancias bi-cónicas (Conical-Conical Reflectance Factor,...
Tipo: Tesis Palavras-chave: Clasificación; Información espectral muti-angular; Sensores remotos; CCRF; Doctorado; Hidrociencias; Classification; Multi angular spectral information; Remote sensing.
Ano: 2008 URL: http://hdl.handle.net/10521/1240
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Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota Colegio de Postgraduados
Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula. Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest..
Ano: 2012 URL: http://hdl.handle.net/10521/849
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Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota Colegio de Postgraduados
Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula. Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest..
Ano: 2012 URL: http://hdl.handle.net/10521/789
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Almacenamiento de carbono en bosques manejados de pinus patula: Estimación mediante percepción remota Colegio de Postgraduados
Aguirre Salado, Carlos Arturo.
Se presenta la metodología y los resultados obtenidos sobre estimación de almacenamiento de carbono mediante técnicas de percepción remota en bosques manejados de Pinus patula en Zacualtipán, Hidalgo, México; la cual surge como una necesidad de monitoreo de los recursos forestales a partir de los compromisos adquiridos por México en el Protocolo de Kyoto para aminorar el inminente cambio climático causado por los denominados gases invernadero (CO2). En esta tesis se estudia principalmente el carbono (CHA) (Mg/ha) aunque preliminarmente resulta necesaria la cuantificación de biomasa (BHA) (Mg/ha). De manera paralela también se estudian algunos parámetros forestales de densidad como índice de área foliar (IAF) (m2/ m2), cobertura arbórea (COB) (%), área...
Tipo: Tesis Palavras-chave: Carbono; Índice de área foliar; Cobertura arbórea; Regresión lineal; K-nn; Percepción remota; SPOT 5; Fotografía hemisferica; Bosque de Pinus patula.; Carbon; Leaf area index; Canopy closure; Linear regression; K-nn; Remote sensing; SPOT 5; Hemispherical photography; Pinus patula forest..
Ano: 2007 URL: http://hdl.handle.net/10521/1172
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An assessment of crop water productivity in the Indus and Ganges River Basins: current status and scope for improvement AgEcon
Cai, Xueliang; Sharma, Bharat R.; Matin, Mir Abdul; Sharma, Devesh; Gunasinghe, Sarath.
The Indus and Ganges River Basin, being the most populous in the world, is under extreme pressure to sustain food security. Production resources including water are being exploited to various levels from underdevelopment to heavy overexploitation. This report provides a bird’s eye view of the basin and focuses on the nexus between agricultural production and water consumption, making it possible to pinpoint the areas with high/low water productivity and identify the factors behind this, which helps to promote informed decision making in light of environmental sustainability.
Tipo: Report Palavras-chave: Water productivity; Crops; Yields; Rice; Wheat; River basins; Models; Remote sensing; Evapotranspiration; Mapping; Crop Production/Industries; Food Security and Poverty.
Ano: 2010 URL: http://purl.umn.edu/112970
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An Assessment of Urban Heat Island Effect using Remote Sensing Data. OceanDocs
Wang, Guiling; Jiang, Weimei; Wei, Ming.
Characteristics of urban heat island (UHI) effect and its cause are investigated by using MODIS data in April 2004. Surface parameters from the MODIS data have surface temperature (ts), albedo(a), and normalized difference vegetation index (NDVI). Their heterogeneities over urban and rural area are analyzed based on land cover classification, and their relations are also presented in order to explain the UHI effect. The results show that there exists obvious the UHI effect. Ts over urban areas are by 10.83 % higher than those over rural area,and NDVI and a over urban area are by 62 % and 18.75 % less than those over rural area, respectively. Surface temperature has significantly negative correlation with NDVI and their correlation coefficient is -0.73....
Tipo: Journal Contribution Palavras-chave: Remote sensing; Albedo; Surface temperature.
Ano: 2008 URL: http://hdl.handle.net/1834/5876
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An Operational Framework for Defining and Monitoring Forest Degradation Ecology and Society
Thompson, Ian D; Canadian Forest Service; ian.thompson@nrcan.gc.ca; Guariguata, Manuel R.; Center for International Forestry Research (CIFOR); M.GUARIGUATA@CGIAR.ORG; Okabe, Kimiko; FFPRI Tsukuba; kimikook@ffpri.affrc.go.jp; Bahamondez, Carlos; INFOR Valdivia; cbahamon@infor.cl; Nasi, Robert; Center for International Forestry Research (CIFOR); r.nasi@cgiar.org; Heymell, Victoria; FAO Rome; Victoria.Heymell@fao.org; Sabogal, Cesar; FAO Rome; cesar.sabogal@fao.org.
Forest degradation is broadly defined as a reduction in the capacity of a forest to produce ecosystem services such as carbon storage and wood products as a result of anthropogenic and environmental changes. The main causes of degradation include unsustainable logging, agriculture, invasive species, fire, fuelwood gathering, and livestock grazing. Forest degradation is widespread and has become an important consideration in global policy processes that deal with biodiversity, climate change, and forest management. There is, however, no generally recognized way to identify a degraded forest because perceptions of forest degradation vary depending on the cause, the particular goods or services of interest, and the temporal and spatial scales considered....
Tipo: Peer-Reviewed Synthesis Palavras-chave: Biodiversity; Carbon; Criteria and indicators; Forest degradation; Forest management; Remote sensing.
Ano: 2013
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