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	Provedor de dados Rev. Ciênc. Agron. (2) Autor Andrade,Eunice Maia de (2) Aquino,Deodato do Nascimento (2) Alexandre,Deborah Mithya Barros (1) Lopes,Fernando Bezerra (1) Moreira,Maurício Alves (1) Palácio,Helba Araújo Queiroz (1) Rocha Neto,Odílio Coimbra da (1) Teixeira,Adunias dos Santos (1) Mais... Palavra-chave Anthropic action-fertilizer (1) Caatinga (1) Desertification (1) Irrigation-water contamination (1) Landsat TM5 (1) NDVI (1) Shallow wells (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Ano 2018 (1) 2010 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Land use and groundwater quality: the case of Baixo Acaraú Irrigated Perimeter, Brazil Rev. Ciênc. Agron. Andrade,Eunice Maia de; Lopes,Fernando Bezerra; Palácio,Helba Araújo Queiroz; Aquino,Deodato do Nascimento; Alexandre,Deborah Mithya Barros. The aim of this work was to identify and to investigate the determining factors of water table quality in the Irrigated Perimeter of Baixo Acaraú, Ceará, Brazil, using factor analysis/principal component analysis (FA/PCA). It was sampled nine shallow wells spread out on two different types of land: uncultivated area (A1) and irrigated area (A2). Groundwater was sampled monthly from Dec/2003 to Nov/2005, Nov/2006, Mar and April/2007. We measured the following parameters: pH, electrical conductivity (EC), and concentrations of Na+, Ca2+, Mg2+, K+, Cl-, PO4-, NH4-, NO3-, SO4-2, HCO3- and CO3- 2. The PCA resulted in a model composed of three components that explained 93.06% and 83.72% of the total variance of the data set from A1 and A2, respectively. It was... Tipo: Info:eu-repo/semantics/article Palavras-chave: Anthropic action-fertilizer; Shallow wells; Irrigation-water contamination. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000200006 Use of remote sensing to identify areas at risk of degradation in the semi-arid region Rev. Ciênc. Agron. Aquino,Deodato do Nascimento; Rocha Neto,Odílio Coimbra da; Moreira,Maurício Alves; Teixeira,Adunias dos Santos; Andrade,Eunice Maia de. ABSTRACT One of the most effective procedures in the evaluation of degraded areas has been the use of remote sensing. The aim of this work was to evaluate the temporal dynamics of the NDVI and rainfall in detecting the degradation of natural resources in a semi-arid region of Brazil. The area under study is located to the west of the district of Tauá, in the State of Ceará, with a predominance of shrub-like caatinga forest. Rainfall data was obtained from FUNCEME. Ten images (dry season) were acquired from a 27-year historical series (1985-2011) from the TM/LANDSAT5 sensor, later converted to surface reflectance using the FLAASH/ENVI extension; NDVI indices were obtained and divided into six classes corresponding to land usage and occupation. The mean... Tipo: Info:eu-repo/semantics/article Palavras-chave: NDVI; Caatinga; Landsat TM5; Desertification. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300420 Registros recuperados: 2 Primeira ... 1 ... Última

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