Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2017-12-11T13:34:57Z No. of bitstreams: 1 PGEF16MA070.pdf: 2448624 bytes, checksum: 4869319201ca98d0673aaafa7f95a8ce (MD5) / Made available in DSpace on 2017-12-11T13:34:57Z (GMT). No. of bitstreams: 1 PGEF16MA070.pdf: 2448624 bytes, checksum: 4869319201ca98d0673aaafa7f95a8ce (MD5) Previous issue date: 2016-02-26 / UNIEDU / This study aimed to evaluate the potential of Eucalyptus badjensis wood for the production of particleboard, as well as mixing it with the wood of Pinus spp. and further compare the effect of using different amounts of urea-formaldehyde adhesive (UF) on the properties of the produced panels. Thus particles were made using panels of E. badjensis and Pinus spp., As well as the mixture of two species in homogeneous composition and multilayer panels panels in proportions 25%/50%/25% using the levels of 8%, 10% and 12% of the urea formaldehyde adhesive. Were realized the analyzes of compression ratio, thickness swelling and water absorption in 2 and 24 hours of immersion in water, not return rate in thickness, modulus of elasticity (MOE) and modulus of rupture (MOR) , Traction perpendicular to the surface (Internalbond) and screw pullout , aiming to enhance discussion of the results were also conducted chemical analyzes of wood , particle geometry and basic wood density. With this study it was concluded that the Eucalyptus badjensis has the potential for making particleboards, as average values presented statistically better or equal to Pinus spp. all properties examined in the same manner was observed that the increase in adhesive, content causes an improvement in the properties of the panels / O presente estudo teve como objetivo avaliar o potencial da madeira de Eucalyptus badjensis para a produção de painéis de madeira aglomerada, bem como de sua mistura com a madeira de Pinus spp. e ainda comparar o efeito da utilizando diferentes teores do adesivo ureia-formaldeído (UF) nas propriedades dos painéis produzidos. Desse modo foram confeccionados painéis utilizando partículas de E. badjensis e de Pinus spp., bem como com a mistura das duas espécies em painéis de composição homogênea e painéis multicamada nas proporções 25%/50%/25 % utilizando os teores de 8%, 10% e 12% do adesivo ureia-formaldeído. Foram realizadas as análises de densidade aparente, razão de compactação, absorção de água e inchamento em espessura em 2 e 24h de imersão em água, taxa de não retorno em espessura (TNRE), modulo de elasticidade (MOE), modulo de ruptura (MOR), tração perpendicular à superfície (ligação interna) e arrancamento de parafuso com o objetivo de aprimorar a discussão dos resultados também foram realizadas análises químicas da madeira, da geometria de partículas e da densidade básica da madeira. Com o presente trabalho foi possível concluir que a madeira de Eucalyptus badjensis apresenta potencial para a confecção de painéis do tipo aglomerado, uma vez que apresentou valores médios melhores ou iguais ao Pinus spp. em todas as propriedades analisadas, do mesmo modo foi observado que o aumento nos teores de adesivo ocasiona uma melhora nas propriedades dos painéis

La luzerne est une légumineuse fourragère pérenne qui présente de nombreux avantages agronomiques et environnementaux. La performance des associations luzerne - graminées est conditionnée par la production de biomasse et la teneur en protéines de chaque espèce et sa survie. L’effet de la variabilité génétique de la luzerne sur les composantes du rendement dans les associations est mal connu. Dans ce contexte, cette thèse a deux objectifs : i) caractériser la diversité génétique pour les caractères liés à la production et à la qualité de la luzerne dans l’association ii) analyser le contrôle génétique de ces caractères. Deux dispositifs comprenant trois traitements (mélange luzerne-fétuque, monoculture et isolé) ont été mis en place. Le premier comprenant 46 génotypes contrastés de luzerne a été phénotypé sur deux ans pour l’architecture, la biomasse et la concentration en protéines. Le deuxième composé d’une population F1 de 198 individus, a été phénotypé sur une année. Cette population F1 a été génotypée avec des marqueurs SSR et DArT pour établir une carte génétique. Une large variation génétique entre les génotypes de luzerne a été montrée. Cette variation affecte la hauteur et la teneur en protéines de la fétuque associée. On a observé que les caractères mesurés en isolé ou en monoculture sont relativement prédictifs des mêmes caractères en mélange, mais une évaluation des génotypes en mélange reste indispensable. La détection de QTL montre que certains QTL sont communs aux différents traitements. Chaque QTL explique de 6 à 23% de la variation observée pour la hauteur et la biomasse. Des pistes méthodologiques pour la sélection sont envisagées. / Alfalfa is a perennial forage legume that has many agronomic and environmental benefits. The performance of alfalfa - grass mixtures depends on biomass production and protein content of each species and its survival. The effect of genetic variation on alfalfa yield components in mixtures is little described. In this context, this thesis has two objectives: i) to characterize the genetic diversity for traits related to alfalfa production and quality in mixture ii) to analyze the genetic control of these traits. Two designs that included three treatments (alfalfa - fescue mixture, monoculture and spaced plants) were established. The first design comprised 46 contrasting alfalfa genotypes which were phenotyped over two years for architecture, biomass and protein concentration. The second design comprised an F1 population of 198 individuals being phenotyped over one year. The F1 population was genotyped with SSR and DArT markers to construct a genetic map. A wide genetic variation among alfalfa genotypes was shown. This variation affected the height and protein content of associated fescue. It was observed that the measured traits of spaced plants or in monoculture are relatively predictive of the same traits in the mixture, but genotype evaluation in mixture is required. QTL detection shows that some QTL were common to different treatments. Each QTL explained 6-23 % of the variation for height and biomass. Some methodologies for selection are proposed.