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	Provedor de dados Rev. Ciênc. Agron. (3) Autor Andrade,Eunice Maia de (3) Palácio,Helba Araújo Queiroz (3) Alexandre,Deborah Mithya Barros (2) Lopes,Fernando Bezerra (2) Aquino,Deodato do Nascimento (1) Ferreira,Andrea Cristina da Silva (1) Mendonça,Luiz Alberto Ribeiro (1) Rodrigues,Joseilson Oliveira (1) Santos,Júlio César Neves dos (1) Mais... Palavra-chave Anthropic action-fertilizer (1) Caatinga (1) Cluster Analysis (1) Ephemeral creek (1) Eutrophization (1) Irrigation-water contamination (1) Shallow wells (1) Soil degradation (1) Soil erosion (1) Water quality (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Ano 2013 (1) 2010 (2) País Brazil (3) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última The water quality investigation using GIS and multivariable analysis in a semiarid region reservoir Rev. Ciênc. Agron. Alexandre,Deborah Mithya Barros; Andrade,Eunice Maia de; Lopes,Fernando Bezerra; Palácio,Helba Araújo Queiroz; Ferreira,Andrea Cristina da Silva. This study was carried out in the Serrote reservoir, sited in the Groaíras watershed at the northeastern region of Ceará State, Brazil. The aim was to investigate the temporal and spatial variability of water quality. Data investigation was processed using multivariate analysis/cluster analysis and GIS techniques. Samples were taken in four stations spreading out over the water body during five campaigns of collection (February, May, August/2007 and May, August/2008). The water quality parameters analyzed were: Electric Conductivity (EC), pH, Dissolved Oxygen (DO), temperature, chlorophyll 'a' concentration and Total Phosphorus (TP). Two homogeneous groups were identified, which expressed the inter-annual seasonality influence in the water quality. The... Tipo: Info:eu-repo/semantics/article Palavras-chave: Water quality; Cluster Analysis; Eutrophization. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902010000400007 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 Sediment loss in semiarid small watershed due to the land use Rev. Ciênc. Agron. Rodrigues,Joseilson Oliveira; Andrade,Eunice Maia de; Palácio,Helba Araújo Queiroz; Mendonça,Luiz Alberto Ribeiro; Santos,Júlio César Neves dos. The aim of this study was to evaluate and compare the sedimentological behavior in two small rural watersheds in the semiarid Northeast of Brazil, examining the influence of human activity on the sediment yields. The studied area is sited in the Alto Jaguaribe basin, more precisely in the Iguatu County, Ceará State. The experimental area was composed of two small watersheds denominated B1 and B2. In watershed B1 a treatment (thinning) was applied, eliminating the plant species with diameters lower than 10 cm. The results showed that the Caatinga clearing practice did have an influence in changing the sediment yield during the first events. It was also found that the magnitude of previous events contributed to an increase in the sediment yields by the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Caatinga; Soil degradation; Soil erosion; Ephemeral creek. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000300010 Registros recuperados: 3 Primeira ... 1 ... Última

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