Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados Scientia Agricola (2) Chilean J. Agric. Res. (1) Autor Arce,Augusto (1) Cabello,María Jesús (1) Cartagena,María del Carmen (1) Castellanos,María Teresa (1) García-Castro,Alexandra (1) Gomes,Francisco Sérgio (1) Oliveira,Luiz Felipe Ramalho de (1) Oliveira,Marcio Leles Romarco de (1) Restrepo-Díaz,Hermann (1) Ribas,Francisco (1) Santana,Reynaldo Campos (1) Tarquis,Ana María (1) Mais... Palavra-chave Leaf nitrogen concentration (3) Chlorophyll fluorescence (1) Dry matter accumulation (1) LAD (1) LAI (1) Leaf reflectance (1) Nitrate leaching (1) Nitrogen use efficiency (1) Non-destructive analyses (1) Production functions (1) Spectral reflectance (1) Spectrometer (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Journal article (1) Ano 2017 (1) 2013 (1) 2011 (1) País Brazil (2) Chile (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Growth dynamics and yield of melon as influenced by nitrogen fertilizer Scientia Agricola Castellanos,María Teresa; Cabello,María Jesús; Cartagena,María del Carmen; Tarquis,Ana María; Arce,Augusto; Ribas,Francisco. Nitrogen (N) is an important nutrient for melon (Cucumis melo L.) production. However there is scanty information about the amount necessary to maintain an appropriate balance between growth and yield. Melon vegetative organs must develop sufficiently to intercept light and accumulate water and nutrients but it is also important to obtain a large reproductive-vegetative dry weight ratio to maximize the fruit yield. We evaluated the influence of different N amounts on the growth, production of dry matter and fruit yield of a melon 'Piel de sapo' type. A three-year field experiment was carried out from May to September. Melons were subjected to an irrigation depth of 100% crop evapotranspiration and to 11 N fertilization rates, ranging 11 to 393 kg ha-1 in... Tipo: Info:eu-repo/semantics/article Palavras-chave: LAI; LAD; Dry matter accumulation; Production functions; Leaf nitrogen concentration. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200009 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 Evaluation of fertilization with uncoated urea and 3,4-dimethylpyrazole phosphate (DMPP)-coated urea on nitrogen leaching and rose (Rosa spp.) yield Chilean J. Agric. Res. García-Castro,Alexandra; Restrepo-Díaz,Hermann. The negative impact of N over-fertilization has acquired importance in rose (Rosa spp.) growers in Colombia. The nitrification inhibitor 3,4-dimethylpyrazole phosphate (DMPP) has been considered a valuable alternative to diminish the N losses by leaching and to enable more efficient N use efficiency in crops. The objective of the present work was to study the effect of DMPP on the mineral N (NH4+- N and NO3--N) content in soil and water leaching, and physiological characteristics of rose plants. A greenhouse experiment was performed for 10 wk. Four-year-old 'Charlotte' rose cultivars grafted on 'Natal Briar' were grown in soil and fertirrigated daily with a complete nutrient solution containing 170 mg N L-1. Two N fertilizers (uncoated urea [UA], and urea... Tipo: Journal article Palavras-chave: Chlorophyll fluorescence; Leaf nitrogen concentration; Nitrate leaching; Nitrogen use efficiency. Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200011 Registros recuperados: 3 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