Federal University of Roraima

About: Federal University of Roraima is a based out in . It is known for research contribution in the topics: Population & Thermogravimetry. The organization has 981 authors who have published 1218 publications receiving 7849 citations. The organization is also known as: Federal University of Roraima.

Desenvolvimento vegetativo de cultivares de feijão-caupi sob lâminas de irrigação no cerrado roraimense

Abstract: DESENVOLVIMENTO VEGETATIVO DE CULTIVARES DE FEIJAO-CAUPI SOB LÂMINAS DE IRRIGACAO NO CERRADO RORAIMENSE VIVIANA DA ENCARNACAO RODRIGUES LOCATELLI¹; ROBERTO DANTAS DE MEDEIROS²; OSCAR JOSE SMIDERLE²; JOSE DE ANCHIETA ALVES DE ALBUQUERQUE³; WELLINGTON FARIAS ARAUJO³ ¹ Mestre em Agronomia, Inspetora de Recursos Naturais do NATURATINS-Tocantins; Rua da Prata 642, Centro, Tocantinopolis-TO. viviana_en@yahoo.com.br ² Doutor em Fitotecnia, Pesquisador A 3 da Embrapa-Roraima. Rodovia BR 174, km 8, Distrito Industrial, Caixa Postal 133 CEP 69301-970, Boa Vista-RR. roberto.medeiros@embrapa.br e oscar.smiderle@embrapa.br ³ Prof. Dr. Associado da UFRR/CCA-Centro de Ciencias Agrarias (Campus Cauame) BR 174 km 12- Monte Cristo. anchietaufrr@gmail.com e wellington.araujo@ufrr.br 1 RESUMO Este trabalho teve por objetivo avaliar as caracteristicas fisiologicas de cultivares de feijao-caupi sob lâminas de irrigacao no cerrado Roraimense. Conduziu-se o experimento entre fevereiro e abril de 2012, no “Campo experimental Agua Boa” pertencente a Embrapa-Roraima, em sistema de cultivo sobre palhada, sob irrigacao por aspersao convencional. O esquema utilizado foi blocos casualizados dispondo os tratamentos em faixa, com parcelas subdivididas e cinco repeticoes. Testou-se quatro lâminas de irrigacao com base na evapotranspiracao de referencia ETo de 30%, 60%, 90% e 120%, estabelecidas diariamente por meio do Tanque Classe A para o qual foi adotado o coeficiente do tanque (Kp) 0,75. As sub-parcelas foram compostas por tres cultivares de feijao-caupi (BRS Guariba, BRS Novaera e BRS Pajeu) sendo avaliados: altura de plantas, massa seca da parte aerea e indice da area foliar, submetendo os dados a analise de variância com aplicacao do Teste F (p < 0,05). As medias das cultivares foram comparadas por meio do teste de Tukey e as medias das lâminas, por meio de regressao polinomial e do Teste t (p < 0,05). Todas as variaveis foram diretamente proporcionais ao incremento das lâminas de irrigacao. A cultivar BRS Pajeu apresentou efeito quadratico, com maxima eficiencia na producao de massa seca da parte aerea com a lâmina de 106,84% da ETo (30 g de MSPA, com aplicacao de 317,75 mm), e maximo indice de area foliar com 89,31% da ETo (IAF = 2,74, com aplicacao de 265,62 mm). Palavras-chave: Vigna unguiculata. Cerrado de Roraima. Feijao macassar. Sistema de plantio direto. LOCATELLI, V. da E. R.; MEDEIROS, R. D. de; SMIDERLE, O. J.; ALBUQUERQUE, J. de A. A. de; ARAUJO, W. F. VEGETATIVE DEVELOPMENT OF COWPEA CULTIVARS UNDER IRRIGATION IN THE SAVANNAH OF RORAIMA 2 ABSTRACT This work was aimed at evaluating the physiological characteristics of cowpea cultivars under irrigation in the Savannah of Roraima. The experiment was carried out from February to April 2012, at the Agua Boa Experimental Station, which belongs to Embrapa Roraima, under no till system and sprinkler irrigation. The experiment used a statistical, strip-split-plot, randomized block design with four treatments, three treatments in the subplots, and five replications. Four water depths (30%, 60%, 90% and 120% of the reference evapotranspiration – ETo) and three cowpea cultivars (BRS Guariba, BRS Novaera and BRS Pajeu) were tested. The irrigation levels were based on fractions of daily ETo, estimated with a Class A evaporation pan, installed near the experimental area, adopting the pan coefficient (Kt) 0.75. The evaluated parameters were plant height, shoot dry mass and leaf area index. The data were submitted to analysis of variance with the F-test (p < 0.05). The means for the cultivars were compared by Tukey’s test, and the means for irrigation water depths, by polynomial regression and by the T-test (p < 0.05). All the analyzed parameters were directly proportional to the increase of the irrigation water depths. The cultivar BRS Pajeu showed a quadratic effect, with maximum efficiency in shoot dry matter production at a water depth of 106.84% ETo (SDM =30 g, with317.75 mm), and maximum leaf area index with 89.31% ETo (LAI = 2.74, with265.62 mm). Keywords: Vigna unguiculata. Savanah of Roraima. No-tillage cropping system.

Professores em formação continuada: narrativas da atividade docente de estudo e a da aprendizagem da docência

Abstract: The continuing education of teachers is in a complex process and dimensions that go beyond the development and implementation of legal regulations. This study presents our understanding of teaching activity study, based on studies of Isaia (2006), the formation and action of teachers of Basic Education and their contribution to the learning processes of teaching (Isaia, 2004 and 2006; BOLZAN, 2004, 2006, 2008, 2009, 2010). Our goal is to identify and understand where and how the study of teaching activity takes place in the formation and action of teachers of basic education and how it contributes to the learning of teaching of these teachers. From the narratives, we identified that the elements of teaching study did not articulate entirety with themselves at different times of the pedagogical practice.

Seasonal Variation of the Essential Oil from Cunila angustifolia Benth. (Lamiaceae)

Abstract: The essential oil of composition obtained from the leaves of Cunila angustifolia, collected in different seasons of the year in the southern Brazilian state of Santa Catarina, was analyzed by GC and GC/MS. Twenty-two compounds were identified and the main constituent of the oil was pulegone. This monoterpene was found in different concentrations, winter (56.5%), spring (72.3%), summer (64.1%) and autumn (56.0%).

Chemical composition and multivariate analysis of the volatile oil of Dalbergia frutescens (Vell.) Britton (Fabaceae)

Abstract: The chemical composition of the volatile oil from the leaves of three specimens of D. frutescens, collected over a period of one year, was determined by gas chromatography-mass spectrometry (GC-MS) and gas chromatography with flame ionization detection (GC-FID). These essential oils were characterized by the presence of norisoprenoids (β-damascenone, β-ionone, and α-ionone), as well as sesquiterpenes. Multivariate analysis showed that the compounds β-damascenone and β-ionone exerted the greatest influence on spatial and temporal differences in the composition of the oils. Samples obtained from specimens located in the same city showed similar chemical compositions.