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	Provedor de dados Scientia Agricola (2) Autor Oliveira,Luiz Felipe Ramalho de (2) Santana,Reynaldo Campos (2) Gomes,Francisco Sérgio (1) Oliveira,Marcio Leles Romarco de (1) Palavra-chave Leaf nitrogen concentration (1) Leaf reflectance (1) Modelling (1) Non-destructive analyses (1) Remote sensing (1) Spectral reflectance (1) Spectrometer (1) Tree monitoring (1) Variable selection (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2020 (1) 2017 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última 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 Estimation of leaf nutrient concentration from hyperspectral reflectance in Eucalyptus using partial least squares regression Scientia Agricola Oliveira,Luiz Felipe Ramalho de; Santana,Reynaldo Campos. ABSTRACT: Leaf hyperspectral reflectance has been used to estimate nutrient concentrations in plants in narrow bands of the electromagnetic spectrum. The aim of this study was to estimate leaf nutrient concentrations using leaf hyperspectral reflectance and verify the variable selection methods using the partial least squares regression (PLSR). Two studies were carried out using stands with Eucalyptus clones. Study I was established in Eucalyptus stands with three clones, classifying leaves into five colour patterns using the Munsell chart for plant tissues. Immediately after leaf collection, leaf reflectance was read and the chemical analysis was performed. Study II was carried out in commercial clonal stands of Eucalyptus performing the same leaf... Tipo: Info:eu-repo/semantics/article Palavras-chave: Remote sensing; Tree monitoring; Modelling; Variable selection. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000601402 Registros recuperados: 2 Primeira ... 1 ... Última

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