Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Scientia Agricola (2) Bragantia (1) AGRIAMBI (1) Autor Barbosa Junior,Bernardo (1) Bernoux,Martial (1) Braga,Alexandra C. (1) Braga,Célia C. (1) Cerri,Carlos Clemente (1) El-Hendawy,Salah (1) Elhoweity,Mohamed (1) Elsayed,Salah (1) Gomes,Francisco Sérgio (1) Herpin,Uwe (1) Montenegro,Suzana M. G. L. (1) Oliveira,Leidjane M. M. de (1) Oliveira,Luiz Felipe Ramalho de (1) Oliveira,Marcio Leles Romarco de (1) Santana,Reynaldo Campos (1) Schmidhalter,Urs (1) Silva,Bernardo B. da (1) Szakács,Gabor Gyula Julius (1) Mais... Palavra-chave Spectral reflectance (4) Atmospheric transmittance (1) Biofertilizer (1) Brazil (1) Climate change (1) Leaf Area Index (1) Leaf nitrogen concentration (1) Leaf reflectance (1) Net radiation (1) Non-destructive analyses (1) Pasture degradation (1) Phenomics (1) Phenotyping (1) Precision agriculture (1) Radiance (1) Soil organic carbon (1) Spectrometer (1) Mais... Tipo do documento Info:eu-repo/semantics/article (4) Ano 2017 (2) 2016 (1) 2011 (1) País Brazil (4) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última Procedures for calculation of the albedo with OLI-Landsat 8 images: Application to the Brazilian semi-arid AGRIAMBI Silva,Bernardo B. da; Braga,Alexandra C.; Braga,Célia C.; Oliveira,Leidjane M. M. de; Montenegro,Suzana M. G. L.; Barbosa Junior,Bernardo. ABSTRACT The surface albedo plays an important role in the exchanges of energy and mass in the planetary boundary layer. Therefore, changes in albedo affect the balance of radiation and energy at the surface, which can be detected with its monitoring. Albedo determination has been performed through various sensors, but there is not yet any publication dealing with albedo calculation procedures using OLI (Operational Land Imager) - Landsat 8 images. The objective of the study is to present the procedures for computing the albedo with OLI images and map it in irrigated areas of the São Gonçalo Irrigated District, PB, Brazil. Images of the year 2013, path 215 and row 65, were selected. The data necessary for calculating the albedo were extracted from each... Tipo: Info:eu-repo/semantics/article Palavras-chave: Radiance; Spectral reflectance; Atmospheric transmittance; Net radiation. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000100003 Estimating foliar nitrogen in Eucalyptus using vegetation indexes Scientia Agricola Oliveira,Luiz Felipe Ramalho de; Oliveira,Marcio Leles Romarco de; Gomes,Francisco Sérgio; Santana,Reynaldo Campos. ABSTRACT Nitrogen (N) has commonly been applied in Eucalyptus stands in Brazil and it has a direct relation with biomass production and chlorophyll content. Foliar N concentrations are used to diagnose soil and plant fertility levels and to develop N fertilizer application rates. Normally, foliar N is obtained using destructive methods, but indirect analyses using Vegetation Indexes (VIs) may be possible. The aim of this work was to evaluate VIs to estimate foliar N concentration in three Eucalyptus clones. Lower crown leaves of three clonal Eucalyptus plantations (25 months old) were classified into five color patterns using the Munsell Plant Tissue Color Chart. For each color, N concentration was determined by the Kjeldahl method and foliar reflectance... Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf nitrogen concentration; Non-destructive analyses; Spectrometer; Spectral reflectance; Leaf reflectance. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200142 Assessing soil carbon stocks under pastures through orbital remote sensing Scientia Agricola Szakács,Gabor Gyula Julius; Cerri,Carlos Clemente; Herpin,Uwe; Bernoux,Martial. The growing demand of world food and energy supply increases the threat of global warming due to higher greenhouse gas emissions by agricultural activity. Therefore, it is widely admitted that agriculture must establish a new paradigm in terms of environmental sustainability that incorporate techniques for mitigation of greenhouse gas emissions. This article addresses to the scientific demand to estimate in a fast and inexpensive manner current and potential soil organic carbon (SOC) stocks in degraded pastures, using remote sensing techniques. Four pastures on sandy soils under Brazilian Cerrado vegetation in São Paulo state were chosen due to their SOC sequestration potential, which was characterized for the soil depth 0-50 cm. Subsequently, a linear... Tipo: Info:eu-repo/semantics/article Palavras-chave: Brazil; Leaf Area Index; Soil organic carbon; Pasture degradation; Spectral reflectance; Climate change. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000500010 Non-invasive spectral detection of the beneficial effects of Bradyrhizobium spp. and plant growth-promoting rhizobacteria under different levels of nitrogen application on the biomass, nitrogen status, and yield of peanut cultivars Bragantia Elsayed,Salah; Elhoweity,Mohamed; El-Hendawy,Salah; Schmidhalter,Urs. ABSTRACT High-throughput phenotyping using spectral reflectance measurements offers the potential to provide more information for making better-informed management decisions at the crop canopy level in real time. The aim of this study was to investigate the suitability of hyperspectral reflectance measurements of the crop canopy for the assessment of biomass, nitrogen concentration, nitrogen uptake, relative chlorophyll contents, and yield in 2 peanut cultivars, Giza 5 and Giza 6. Peanuts were grown under field conditions and subjected to 3 doses of nitrogen fertilizer with or without the application of 2 bio-fertilizers, Bradyrhizobium spp. or plant growth-promoting rhizobacteria. Simple linear regression of normalized difference spectral indices and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofertilizer; Phenomics; Phenotyping; Precision agriculture; Spectral reflectance. Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200189 Registros recuperados: 4 Primeira ... 1 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco