Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-05-17T17:02:12Z No. of bitstreams: 1 2012 - Dany Roberta Marques Caldeira.pdf: 1990355 bytes, checksum: 5ec0ad500af1f1db0fb2bd0d183cbe7c (MD5) / Made available in DSpace on 2017-05-17T17:02:12Z (GMT). No. of bitstreams: 1 2012 - Dany Roberta Marques Caldeira.pdf: 1990355 bytes, checksum: 5ec0ad500af1f1db0fb2bd0d183cbe7c (MD5) Previous issue date: 2012-08-01 / The aim was to allow students greater knowledge of alternative sustainable practices that promote integration of agricultural and environmental learning, and it is hoped that the theme Sustainable Development to be used not only in a theoretical way, but especially practical for those students who will work directly with natural resources, when they entered the labor market. The subjects studied were high school students of the Technical Course in Agriculture at the Federal Institute of Rond?nia, Western Colorado campus. For the development of the research project were implemented research strategies such as literature review, installation of experiments, questionnaires and study the pedagogical course. The questionnaires were administered to 35 students in 3rd year high school course in Farming Technician to ascertain which understanding of ourselves in relation to alternative practices that promote sustainable agricultural development. After the questionnaires was made to tabulate these data, where it was found that 46% of students believe that Sustainable Development is development that does not harm the environment, 33% do not know or remember what it's about the subject, 9% believe it is the reuse of waste and 12% think it refers to subsistence farming. After the experience of students in the same experiments had greater assimilation in relation to the design of Sustainable Agricultural Development, relating it no more no environmental damage, but the reduction of environmental impacts, improved quality of life and income generation. / O objetivo deste trabalho foi caracterizar o curso T?cnico em Agropecu?ria Integrado ao Ensino M?dio, quanto ao desenvolvimento agr?cola sustent?vel. A partir desta caracteriza??o buscou-se trazer o Desenvolvimento Agr?cola Sustent?vel como pr?tica educacional a fim de se propiciar maior conhecimento de pr?ticas alternativas sustent?veis, que promovam a integra??o do aprendizado agropecu?rio-ambiental Os sujeitos estudados foram os alunos do ensino m?dio do Curso T?cnico em Agropecu?ria do Instituto Federal de Rond?nia, campus Colorado do Oeste. Para o desenvolvimento do projeto de pesquisa foram implementadas estrat?gias de investiga??o como a revis?o de literatura, instala??o de experimentos, aplica??o de question?rios e estudo do projeto pedag?gico do curso. Os question?rios foram aplicados a 35 alunos do 3? ano do ensino m?dio do Curso T?cnico em Agropecu?ria a fim de conhecer qual a compreens?o dos mesmos em rela??o ?s pr?ticas alternativas que promovam o desenvolvimento agropecu?rio sustent?vel. Ap?s a aplica??o dos question?rios foi realizada a tabula??o destes dados, onde percebeu-se que 46% dos alunos consideram que o Desenvolvimento Sustent?vel ? o desenvolvimento que n?o agride o ambiente, 33% n?o sabem ou n?o se lembram do que se trata o tema, 9% acreditam que ? o reaproveitamento dos res?duos e 12% pensam que se refere a agricultura de subsist?ncia. Ap?s a viv?ncia dos alunos nos experimentos os mesmos tiveram uma maior assimila??o em rela??o ? concep??o do Desenvolvimento Agropecu?rio Sustent?vel, relacionando-o n?o mais a n?o agress?o ambiental, mas sim a redu??o de impactos ambientais, melhoria da qualidade de vida e gera??o de renda

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-05-19T11:27:05Z No. of bitstreams: 1 2015 - Jos? Claudio Bezerra M. Junior.pdf: 1045163 bytes, checksum: d759d4bffb13bbf9696edda30c7326f2 (MD5) / Made available in DSpace on 2017-05-19T11:27:05Z (GMT). No. of bitstreams: 1 2015 - Jos? Claudio Bezerra M. Junior.pdf: 1045163 bytes, checksum: d759d4bffb13bbf9696edda30c7326f2 (MD5) Previous issue date: 2015-12-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The determination of digestible lysine requirements for Nile tilapia is essential to adjust the correct balance of amino acids in it?s food. Lysine is the amino acid reference for studies in ideal protein, which is currently an important concept in animal nutrition once it allows a reduction in the protein amount of the diet without compromising performance, and furthermore reducing the nitrogen excretion and eutrophication risks of the water. This study aimed to determine the digestible lysine requirement for Nile tilapia in the final phase of growth (500 to 600 g of body weight). Isocaloric and isoproteic experimental diets were utilized with different levels of digestible lysine in each formulation. The amounts of L-lysine HCl 78% used were 0.000; 0.388; 0.776; 1.164, and 1.552% replacing the ingredient glutamic acid 99%; which adjust the treatments to 0.932; 1.23; 1.53; 1.83, and 2.14% of digestible lysine. Nile tilapia weighing 519 g making a sum of 300 animals were utilized in this experiment. They were distributed in 25 water tanks each one measuring a 1000 liters using a renewable system of water. The pH, dissolved oxygen, temperature, salinity and conductivity were monitored daily and ammonia was measured weekly. Slaughters happened when fishes reached 28 and 50 days counting from the beginning of the experiment. The following animal science aspects were evaluated at the end: weight gain (WG), daily weight gain ratio (DWGR), specific growth rate (SGR), food intake (FI), consumption of digestible lysine (CDL), food conversion (FC) protein efficiency gain (PEG), lysine efficiency gain (LEG), nitrogen retention efficiency (NRE), protein deposition rate (PDR), Daily fat deposition rate (DFDR), protein retention efficiency (PRE), and survival rate (SR). The data was interpreted by analysis of variance with 5% probability. There was quadratic effect for GP, CA, TCE, ELG, EPG. The estimated value of lysine for both the largest GP and the best CA is 1.31% digestible lysine. There was no significant differency regarding the food intake, carcass or filet characteristics. This result is in part due to the fact of the gain being proportional throughout the body of the fish. In the second slaughter were obtained quadratic effect in the ether extract and carcass moisture. The Nile tilapia in the weight range of 500 to 600 grams of body weight presents the requirement for 1.31% of digestible lysine, corresponding to 5.31% of digestible dietary protein and 0.431% per Mcal of digestible energy for greater weight gain and better food conversion in it?s experiment conditions / A determina??o da exig?ncia de lisina para a til?pia-do-Nilo ? importante para a elabora??o de ra??es com adequado balanceamento de amino?cidos. A lisina ? o amino?cido refer?ncia nos estudos de prote?na ideal, um conceito relevante atualmente uma vez que permite a redu??o na quantidade de prote?na da ra??o sem comprometimento do desempenho, diminuindo ainda a excre??o de nitrog?nio para a ?gua e o risco de eutrofiza??o. O presente trabalho objetivou determinar a exig?ncia em lisina digest?vel para a til?pia-do-Nilo na fase de 500 a 600 g de peso vivo. Foram utilizadas dietas experimentais que consistiram em ra??es isocal?ricas, isoproteicas e com valores crescentes de lisina digest?vel. A L-lisina HCl 78% foi utilizada com valores crescentes (0,000; 0,388; 0,776; 1,164 e 1,552%), em substitui??o ao ingrediente ?cido glut?mico (99%), perfazendo os tratamentos com 0,932; 1,23; 1,53; 1,83 e 2,13% de lisina digest?vel. Foram utilizadas 300 til?pias-do-Nilo com peso m?dio de 519 g e distribu?dos em 25 caixas d??gua de 1000 L em sistema aberto de circula??o de ?gua. O pH, oxig?nio dissolvido, temperatura, salinidade e condutividade da ?gua foram monitorados diariamente e a am?nia foi medida semanalmente. Foram realizados 2 abates, aos 28 dias e aos 50 dias de experimento. Foram avaliados os seguintes ?ndices zoot?cnicos: ganho de peso (GP), ganho de peso di?rio (GPD), taxa de crescimento espec?fico (TCE), ingest?o alimentar (IA), consumo de lisina digest?vel (CLD), convers?o alimentar (CA), efici?ncia proteica para ganho (EPG), efici?ncia de lisina para ganho (ELG), efici?ncia de reten??o de nitrog?nio (ERN), taxa de deposi??o de prote?na (TDP), taxa de deposi??o di?ria de gordura (TDG), efici?ncia de reten??o de prote?na (ERP) e taxa de sobreviv?ncia (TS). Os dados foram interpretados por meio de an?lise de vari?ncia a 5% de probabilidade. Houve efeito quadr?tico para GP, CA, TCE, ELG, EPG, sendo o valor estimado de lisina tanto para o maior GP quanto para a melhor CA de 1,31% de lisina digest?vel. N?o houve diferen?a significativa para o consumo de ra??o, rendimento de carca?a, rendimento de fil?, caracter?sticas da carca?a e do fil?. Esses resultados se devem em parte ao fato do ganho ter sido proporcional em todo o corpo do peixe. No segundo abate houve efeito quadr?tico no extrato et?reo e na umidade da carca?a. A Til?pia-do-Nilo na faixa de peso de 500 a 600 gramas de peso vivo apresenta a exig?ncia de 1,31% de lisina digest?vel, que corresponde a 5,31% da prote?na digest?vel da dieta e a 0,431%/Mcal de energia digest?vel para o maior ganho de peso e melhor convers?o alimentar nas condi??es deste experimento.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-05-22T13:34:00Z No. of bitstreams: 1 2016 - Ronner Joaquim Mendon?a Brasil.pdf: 1892406 bytes, checksum: 2af27f8c4405579c52f8e3c5a83f0bce (MD5) / Made available in DSpace on 2017-05-22T13:34:00Z (GMT). No. of bitstreams: 1 2016 - Ronner Joaquim Mendon?a Brasil.pdf: 1892406 bytes, checksum: 2af27f8c4405579c52f8e3c5a83f0bce (MD5) Previous issue date: 2016-04-08 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Lysine is an essential amino acid used as a reference in diets based on the ideal protein concept. Determining the actual requirement for lysine is of great importance to formulate efficient feed without amino acids limitation or excesses. Three experiments were conducted in the Poultry Complex of Integrated Production Centre at Federal Rural University of Rio de Janeiro, objecting to estimate the digestible lysine requirements to broilers of low genetic potential for growth through the assessment of performance, carcass characteristics and breast meat quality. The first experiment corresponds to growth phase I (29-49 days), the second growth phase II (50-69 days) and the third final phase (70-84 days), where during each experiment was used different chickens. All experiments were conducted in a completely randomized design, with five treatments, four replications and twenty experimental units. The treatments were set with increasing lysine amounts obtained from the addition of L-Lysine HCl to the basal diet, replacing the ingredient corn starch as follows: 0.871, 1.011, 1.151, 1.291 and 1.431% in the growth phase I; 0.803, 0.943, 1.083, 1.223 and 1.363% in the growth phase II; and 0.766, 0.906, 1.046, 1.186% and 1.326% in the final phase. At the three stages studied, the lysine values nfluenced quadratically feed intake, weight gain and feed conversion. Lysine intake increased with enhanced amounts of lysine, however, it was detected a decrease in its usage efficiency. It was possible to measure the nutritional requirements for feed intake (1.298, 1.109, 1.150%), weight gain (1.183, 1.199, 1.162%) and feed conversion (1.203, 1.162, 1.126%), respectively for the growth phases I, II and final. The absolute weight as well as carcass and cuts yield were influenced by digestible lysine values of rations, where the highest carcass yield for growth phase I (73.62%) was estimated in the value of 1.162%, growth phase II (74.24%) in the value of 1.068%, and final phase (69.34%) in the value of 1.065% for digestible lysine. For chemical composition of breast meat, birds slaughtered at 70 days of age (growth phase II) was observed linear increase in moisture percentage and crude protein, and reduction the ether extract percentage. Nevertheless, it was not observed significant effect of broilers slaughtered at 85 days of age (final phase). For birds slaughtered at 70 and 85 days of age, the weight loss was significant by thawing and cooking the breast meat, increasing as improved lysine values. Therefore, optimizing feed conversion of Redbro Plum? broilers might be recommended, respectively, 1.203, 1.162, and 1.126% of lysine in the diet at phases 29 to 49, 50 to 69, and 70 to 84 days of age, corresponding to a proportion of digestible lysine:crude protein 6.09, 6.34, and 6.36%. / A lisina ? um amino?cido essencial utilizado como refer?ncia em ra??es formuladas com base no conceito de prote?na ideal. A determina??o da real exig?ncia de lisina ? de grande import?ncia na formula??o de ra??es eficientes, sem limita??es ou excessos de amino?cidos. Tr?s experimentos foram conduzidos no Setor de Avicultura do Centro de Produ??o Integrada da Universidade Federal Rural do Rio de Janeiro, com os objetivos de estimar as exig?ncias de lisina digest?vel para frangos de corte de menor potencial gen?tico para crescimento, atrav?s da avalia??o do desempenho, caracter?sticas de carca?a e de qualidade da carne do peito. O primeiro experimento corresponde a fase de crescimento I (29-49 dias), o segundo a fase de crescimento II (50-69 dias) e o terceiro a fase final (70-84 dias), sendo que em cada experimento foram utilizados frangos distintos. Todos os experimentos foram conduzidos em delineamento experimental inteiramente casualizado, com cinco tratamentos, quatro repeti??es e 20 unidades experimentais. Os tratamentos foram constitu?dos com valores crescentes de lisina digest?vel obtidos a partir da adi??o de L-Lisina HCl ? dieta basal, em substitui??o ao ingrediente amido de milho., sendo: 0,871; 1,011; 1,151; 1,291 e 1,431% na fase de crescimento I; 0,803; 0,943; 1,083; 1,223 e 1,363% na fase de crescimento II; e 0,766, 0,906; 1,046; 1,186% e 1,326% na fase final. Nas tr?s fases estudadas os valores de lisina digest?vel influenciaram de forma quadr?tica o consumo de ra??o, ganho de peso e convers?o alimentar. O consumo de lisina aumentou com os valores crescentes de lisina digest?vel, no entanto foi verificado uma redu??o na efici?ncia de utiliza??o de lisina. Foi poss?vel a estimativa das exig?ncias nutricionais para o consumo de ra??o (1,298; 1,109; 1,150%), ganho de peso (1,183; 1,199; 1,162%) e convers?o alimentar (1,203; 1,162; 1,126%), respectivamente para as fases de crescimento I, II e final. Os pesos absolutos e rendimentos de carca?a e cortes foram influenciados pelos valores de lisina digest?vel das ra??es, sendo que na fase de crescimento I o maior rendimento de carca?a (73,62%) foi estimado no valor de 1,162%, na fase de crescimento II (74,24%) no valor de 1,068%, e na fase final (69,34%) no valor de 1,065% de lisina digest?vel. Para composi??o qu?mica da carne do peito, nos frangos abatidos aos 70 dias de idade (fase de crescimento II) foi verificado efeito linear crescente no porcentual de umidade e prote?na bruta, e decrescente no porcentual de extrato et?reo. J? nos frangos abatidos aos 85 dias de idade (fase final), n?o foi constatado efeito significativo. Nos frangos abatidos aos 70 e 85 dias de idade, as perdas de peso por descongelamento e cozimento na carne do peito foram significativas, aumentando a medida que aumentou os valores de lisina digest?vel. Para otimiza??o da convers?o alimentar de frangos de corte Redbro Plum? podem ser recomendados, respectivamente, 1,203, 1,162 e 1,126% de lisina digest?vel na dieta nas fases de 29 a 49, 50 a 69 e 70 a 84 dias de idade, correspondendo a uma rela??o lisina digest?vel:prote?na bruta de 6,09; 6,34 e 6,36%.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-05-26T11:15:17Z No. of bitstreams: 1 2016 - Herton Chimelo Pivoto.pdf: 1107224 bytes, checksum: 991d94d5194f43c503b47b2bd3cdb460 (MD5) / Made available in DSpace on 2017-05-26T11:15:18Z (GMT). No. of bitstreams: 1 2016 - Herton Chimelo Pivoto.pdf: 1107224 bytes, checksum: 991d94d5194f43c503b47b2bd3cdb460 (MD5) Previous issue date: 2015-12-11 / The concern for human health and the environment has led to a growth in the demand and supply of organic or ecological products. The Strawberry (Fragaria x ananassa) in spite of its excellent nutritional characteristics featured in recent years as a product contaminated with pesticides, generating consumer insecurity. And, given the insecurity in relation to their consumption, organic production seeks to regain the confidence of consumers. The aim of this study was to evaluate the feasibility of the production of Strawberry in semi-hidrop?nico organic system cultivated in plastic bags and sugar cane bagasse substrate decomposed. The delineation used was fully randomized blocks with five repetitions. The variables evaluated were: Pseudofrutos number per plant (NF), fresh pasta of Pseudofrutos (MFP), production per plant (PPP), commercial production (CP), Titratable Acidity (AT), hydrogen potential (pH), firm-fleshed (FP), Total soluble solids (TSS), leaf area (AF), leaf area ratio (RAF), leaf (RPF) weight, relative growth rate (TCR), absolute growth rate (TCA) and net assimilat?ria rate (such). Two experiments were carried out in the municipality of S?o Vicente do Sul, Central Rio Grande do Sul, under protected environment, one with a cultivar of photoperiod critical to flowering "short days", the ' Camino Real ' and another with farming, which does not require critical photoperiod for flower "neutral" days, the ' Albion '. Both were grown in semi-hidrop?nico system, involving: four different fertilizer management, which are: fertirrigado with conventional fertilization (control), biofertilizers Agrobio, Super Thin and biofertilizer drawn from commercial organic fertilizer (Ferticel). The growth characteristics of AF, TCR, TCC, RAF, RPF and TAL were influenced significantly by treatments, the results Bioferticel compatible and Biofertilizer in some variables above control for both cultivars. On cultivating actual path there were significant differences for the treatments, and the treatment with Bioferticel had superior results for control variables: NF, PPP, FP, SST, and relationship SSTAT. The levels of nutrients in the leaves of the strawberry Camino Real and Albion were within the recommendation for culture or slightly above in the analysis carried out in full bloom. In the final analysis of cultivation the Super slim and Biofertilizers Agrobio showed levels of phosphorus and potassium below the recommended for culture for both cultivars. The strawberry PC Camino Real was superior in treating Bioferticel, reaching values of gr 650.51.1 and plant 516.36 Gr. 1 plant for the control. To cultivate Albion, there were significant differences for the treatments, and the Control treatment had superior results to other treatments for the variables: NF, PPP, SST, and relationship SSTAT. The strawberry PC Albion was lower than the average considered ideal for the State of Rio Grande do Sul. The biofertilizer Bioferticel in some of the aspects studied, provided superior results to the conventional. So, can be indicated as a means to the substrate semi-hidrop?nico bagasse decomposed for Strawberry cultivation. / A preocupa??o com a sa?de humana e do meio ambiente tem levado a um crescimento na demanda e na oferta de produtos org?nicos ou agroecol?gicos. O morango (Fragaria x ananassa) apesar de suas excelentes caracter?sticas nutricionais figurou nos ?ltimos anos como um produto contaminado por agrot?xicos, gerando inseguran?a ao consumidor. E, diante da inseguran?a em rela??o ao seu consumo, a produ??o org?nica busca recuperar a confian?a dos consumidores. O objetivo deste trabalho foi avaliar a viabilidade da produ??o do morangueiro em sistema semi-hidrop?nico org?nico cultivado em sacos pl?sticos e substrato baga?o de cana decomposto. O delineamento utilizado foi de blocos inteiramente casualizados com cinco repeti??es. As vari?veis avaliadas foram: N?mero de Pseudofrutos por planta (NF), Massa Fresca de Pseudofrutos (MFP), Produ??o por Planta (PPP), Produ??o Comercial (PC), Acidez Titul?vel (AT), Potencial Hidrogeni?nico (pH), firmeza de polpa (FP), S?lidos Sol?veis Totais (SST), ?rea foliar (AF), raz?o de ?rea foliar (RAF), raz?o de peso foliar (RPF), taxa de crescimento relativo (TCR), taxa de crescimento absoluto (TCA) e taxa assimilat?ria l?quida (TAL). Foram realizados dois experimentos no munic?pio de S?o Vicente do Sul, regi?o Central do RS, sob ambiente protegido, um com uma cultivar de fotoper?odo cr?tico para florescimento ?de dias curtos?, a ?Camino Real? e outro com cultivar, que n?o necessita de fotoper?odo cr?tico para florescer ?de dias neutros?, a ?Albion?. Ambas foram cultivadas em sistema semi-hidrop?nico, envolvendo: quatro diferentes manejos de aduba??o, quais sejam: fertirrigado com fertiliza??o convencional (controle), biofertilizantes Agrobio, Super Magro e biofertilizante elaborado a partir de adubo org?nico comercial (Ferticel). As caracter?sticas de crescimento AF, TCR, TCC, RAF, RPF e TAL foram influenciadas significativamente pelos tratamentos, o Biofertilizante Bioferticel obteve resultados compat?veis e em algumas vari?veis superiores ao controle para ambas as cultivares. Na cultivar Caminho Real verificaram-se diferen?as significativas para os tratamentos, sendo que o tratamento com Bioferticel teve resultados superiores ao controle para as vari?veis: NF, PPP, FP, SST, AT e rela??o SST/AT. Os teores de nutrientes nas folhas do morangueiro Camino Real e Albion estiveram dentro da recomenda??o para a cultura ou levemente acima na an?lise realizada em pleno florescimento. Na an?lise de final de cultivo os Biofertilizantes Super Magro e Agrobio apresentaram teores de F?sforo e Pot?ssio abaixo do recomendado para a cultura para ambas as cultivares. A PC do morangueiro Camino Real foi superior no tratamento Bioferticel, atingindo valores de 650,51 gr.planta-1 e de 516,36 gr.planta-1 para o controle. Para a cultivar Albion, verificaram-se diferen?as significativas para os tratamentos, sendo que o tratamento Controle teve resultados superiores aos demais tratamentos para as vari?veis: NF, PPP, SST, AT e rela??o SST/AT. A PC do morangueiro Albion foi inferior ? m?dia considerada ideal para o estado do Rio Grande do Sul. O biofertilizante Bioferticel, em alguns dos aspectos estudados, proporcionou resultados superiores ao Convencional. Assim, pode ser indicado como meio semi-hidrop?nico ao substrato baga?o de cana decomposto para cultivo do Morangueiro

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-08-08T14:42:16Z No. of bitstreams: 1 2016 - Rebecca Barbosa Silva.pdf: 755345 bytes, checksum: 51b2e7f47c9cc4e8177521a6ed62a89d (MD5) / Made available in DSpace on 2017-08-08T14:42:16Z (GMT). No. of bitstreams: 1 2016 - Rebecca Barbosa Silva.pdf: 755345 bytes, checksum: 51b2e7f47c9cc4e8177521a6ed62a89d (MD5) Previous issue date: 2016-03-04 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Molecular markers are important tools in the marker assisted selection programs (MAS). Leptin is expressed hormone mainly in the adipocytes and involved in the regulation of energy metabolism, fat deposition, regulation of glycemia and reproductive physiology and thus has been investigated in association studies quality carcass characteristics and meat in different species. Objective with this work identify the polymorphism in the Leptin gene, changes in qualitative and quantitative characteristics of meat and goat carcass and relate variations of productive features to potential polymorphisms. They were used for genotyping 38 goats intact males, 21 Saanen and 17 crusaders Boer x Saanen. Genotypes for the marker were identified by PCR-RFLP technique based on standardized protocols for SNP305. DNA samples were isolated from leukocyte genomic and amplified through reaction technique Polymerase Chain Reaction (PCR). The generated PCR fragments of 94 base pairs (bp) were digested by Kpn2I enzyme yielding two fragments 75 (bp), 19 (bp) for all individuals analyzed, obtaining allelic frequency of 100% for T. Thus genotype, it was not possible to correlate the results obtained in the evaluation of quality meat and carcass to the results of the molecular study. For the evaluation of carcass quality and meat was used 18 male, 9 Saanen and Saanen x 9 crusaders Boer. t test was used for independent samples of the statistical program BioEstat the 5% significance (P<0.05) for morphometric measurements, live weight, live weight after fasting, hot carcass weight, cold carcass weight, cooling breaks, carcass yield, loss of cooling, thick fat cover, color, pH, water holding capacity and tenderness of the meat, weight and yield cuts (shoulder, hand saw, rib set, ham and loin) and compactness index of carcass. The grouping of the Crusaders animals showed significant differences (P<0.05) for wide shank and shear force. For Saanen animals, there was a significant difference (P<0.05) for the external length of the housing. Although Crossed have shown higher shear strength values (P<0.05), the two groups had average below 5.4 kg-f cm-?, featuring soft meats in goats (2.20 and 1, 57 kg f cm-2 for Crossed and Saanen, respectively). The results showed that the use of both the Crusaders animals, as the Saanen animals are a viable option for dairy farmers who wish to diversify their activities, taking advantage of the disposal of male goats for meat production / Os marcadores moleculares s?o importantes ferramentas nos programas de sele??o assistida por marcadores (MAS). A Leptina ? um horm?nio expresso principalmente nos adip?citos e est? envolvido na regula??o do metabolismo energ?tico, deposi??o de gordura, regula??o da glicemia e fisiologia reprodutiva e por isso tem sido investigado em estudos de associa??o a caracter?sticas de qualidade de carca?a e carne em diferentes esp?cies. Objetiva-se com este trabalho identificar o polimorfismo no gene da Leptina, as varia??es nas caracter?sticas qualitativas e quantitativas da carne e da carca?a de caprinos e relacionar as varia??es das caracter?sticas produtivas a poss?veis polimorfismos. Foram utilizados para a genotipagem 38 cabritos machos inteiros, sendo 21 Saanen e 17 Cruzados Saanen x Boer. Os gen?tipos para o marcador foram identificados pela t?cnica de PCR-RFLP com base nos protocolos padronizados para o SNP305. Foram isoladas amostras de DNA gen?mico a partir de leuc?citos e amplificados por interm?dio da t?cnica de Rea??o em Cadeia de Polimerase (PCR). A PCR gerou fragmentos de 94 pares de bases (pb) que foram digeridos pela enzima Kpn2I, originando dois fragmentos de 75 (pb) e 19 (pb) para todos os indiv?duos analisados, obtendo frequ?ncia al?lica de 100% para o gen?tipo T. Dessa forma, n?o foi poss?vel correlacionar os resultados obtidos na avalia??o de qualidade de carne e carca?a aos resultados obtidos no estudo molecular. Para a avalia??o de qualidade de carca?a e carne foram utilizados 18 machos inteiros, 9 Saanen e 9 Cruzados Saanen x Boer. Foi aplicado o teste t para amostras independentes do programa estat?stico BioEstat a 5% de signific?ncia (P<0,05) para as medidas morfom?tricas, peso vivo, peso vivo ap?s jejum, peso de carca?a quente, peso de carca?a fria, quebra de resfriamento, rendimentos de carca?a, perda por resfriamento, espessura de gordura de cobertura, cor, pH, capacidade de reten??o de ?gua e maciez da carne, peso e rendimento de cortes (paleta, serrote, carr?, pernil e lombo) e ?ndice de compacidade da carca?a. O grupamento dos animais Cruzados apresentou diferen?as significativas (P<0,05) para largura de pernil e for?a de cisalhamento. Para os animais Saanen, houve diferen?a significativa (P<0,05) para o comprimento externo da carca?a. Embora os Cruzados tenham apresentado maiores valores de for?a de cisalhamento (P<0,05), os dois grupos obtiveram m?dias abaixo de 5,4 kg-f cm-2, o que caracteriza carnes macias em caprinos (2,20 e 1,57 kg-f cm-2 para Cruzados e Saanen, respectivamente). Os resultados mostraram que a utiliza??o tanto dos animais Cruzados, quanto dos animais Saanen s?o uma op??o vi?vel aos produtores de leite que desejam diversificar as atividades, aproveitando os cabritos machos de descarte para a produ??o de carne

Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-08-22T12:27:15Z No. of bitstreams: 1 2010 - Herivelto Jos? Coelho.pdf: 1297929 bytes, checksum: 72022180b9345d2204f89d89397cf6c7 (MD5) / Made available in DSpace on 2017-08-22T12:27:15Z (GMT). No. of bitstreams: 1 2010 - Herivelto Jos? Coelho.pdf: 1297929 bytes, checksum: 72022180b9345d2204f89d89397cf6c7 (MD5) Previous issue date: 2010-09-21 / This work aimed to verify the students of 3rd grade of Integrated Courses of Agriculture and Agribusiness, changes in terms of study habits, expectations, construction and applicability of knowledge and their positions on the teaching-based learning in Pedagogy of Projects. The Pedagogy of Project is presented as a methodology that can break with the theory / practice dichotomy, since it induces the student to develop competencies - knowledge, skills and values. This pedagogy also took us to ways of inter and transdisciplinarity, because agricultural projects require interventions that belong to different fields of knowledge. The activity discussed, proposed and negotiated by students was the implementation of the Project Grow Basil and of Lemongrass. From this project, students produced texts, collectives and individuals, representing their ability to plan, reflect, record and evaluate a work, in full, with autonomy. The tools used were semi-structured questionnaires: one applied to the 156 students at the beginning of 2008, when they reached the school, and the other, applied to 28 students randomly chosen among those involved in the process, seeking to identify their perceptions regarding the application of Pedagogy of Project. Were also used as instruments of this research texts prepared by students during the course of activities of the Project. Observing the results, We come to the conclusion that the Pedagogy of Project constitutes an excellent method to allow students to construct knowledge with self-confidence, a spirit of cooperation, responsibility, democracy and autonomy, especially in Professional Education. / Este trabalho teve por objetivo verificar nos alunos da 3? s?rie dos Cursos T?cnicos Integrados de Agropecu?ria e de Agroind?stria, mudan?as em termos de h?bitos de estudo, expectativas, constru??o e aplicabilidade de conhecimentos e suas posturas diante do processo de ensino-aprendizagem baseado na Pedagogia de Projetos. A Pedagogia de Projetos apresenta-se como uma metodologia que pode romper com a dicotomia teoria/ pr?tica, uma vez que induz o aluno a desenvolver compet?ncias ? conhecimentos, habilidades e valores. Esta pedagogia tamb?m nos levou aos caminhos da inter e da transdisciplinaridade, pois projetos de agropecu?ria exigem interven??es que pertencem a diversos campos do conhecimento. A atividade discutida, proposta e negociada pelos alunos foi a implanta??o do Projeto de Cultivo do Manjeric?o e do Capim Santo. A partir deste Projeto, os alunos elaboraram textos, coletivos e individuais, que representam sua capacidade de planejar, refletir, registrar e avaliar um trabalho, por inteiro, com autonomia. Os instrumentos aplicados foram question?rios semi-estruturados: um aplicado para os 156 alunos, no in?cio do ano de 2008, quando chegaram ? escola e outro, aplicado a 28 alunos escolhidos aleatoriamente entre os envolvidos no processo, procurando detectar suas percep??es quanto ? aplica??o da Pedagogia de Projetos. Foram ainda utilizados como instrumentos desta pesquisa textos elaborados pelos alunos durante o transcorrer das atividades do Projeto. Observando-se os resultados chega-se ? conclus?o de que a Pedagogia de Projetos constitui-se excelente metodologia para permitir aos alunos constru??o de conhecimento com autoconfian?a, esp?rito de coopera??o, responsabilidade, democracia e autonomia, principalmente na Educa??o Profissional.

Submitted by Sandra Pereira (srpereira@ufrrj.br) on 2017-08-22T15:27:16Z No. of bitstreams: 1 2009 - Andre Luiz Oliveira Cirqueira.pdf: 2107082 bytes, checksum: 332d5419e8942ce8ee1ccd478e906c34 (MD5) / Made available in DSpace on 2017-08-22T15:27:16Z (GMT). No. of bitstreams: 1 2009 - Andre Luiz Oliveira Cirqueira.pdf: 2107082 bytes, checksum: 332d5419e8942ce8ee1ccd478e906c34 (MD5) Previous issue date: 2009-10-29 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq, Brasil. / Tropical flower production has growing in Brazil, mostly by the recent interest of flower consumers on products with exotic shapes, vibrant colors and high durability. These flowers, not usual in Brazil, are still produced on low scale. Production systems have not been intensively exploited, as well as basic studies with the various varieties and species have not been conducted. Production systems that combine economic feasibility with low environmental impact should de developed for this plant group, since they adapt to a wide range of environmental conditions, including shade. Environment adaptation studies combined with mineral nutrition studies are necessary to understand and improve integrated tropical flower production, using other pla nt species under various environmental conditions. Alley cropping, used on this study, is an example of such integration. This research evaluated the performance of hybrid heliconia Golden Torch (Heliconia psittacorum L x Heliconia spathocircinada Aristigueta) under alley cropping with pigeonpea (Cajanus cajan (L.) Millsp.) and Flemingia macrophylla and a control treatment. Two rates of thermophosphate (Yorin Master 1) ? with or without, were combined to the previous treatments. The experiment was conducted at the Crop Science Department of Universidade Federal Rural do Rio de Janeiro. The experimental design was a split plot in complete randomized design. Lower heliconia mortality occurred on alleys formed by Cajanus cajan. Phosphate addition did not affect mortality. Higher yields of heliconia flowers were observed on Flemingia macrophylla alleys, followed by Cajanus cajan and control. Phsophate addition did not affect yields. Number of lateral shoots was affected by the plant position on the plot: central rows tended to have more shoots than lateral rows. Leaf area was higher where phosphate was applied, independently of alley cropping. / A floricultura tropical tem se projetado no Brasil, principalmente pelo recente interesse dos consumidores de flores, por produtos de formas ex?ticas, cores vibrantes e alta durabilidade. Essas flores, pouco tradicionais no Brasil, s?o produzidas ainda em pequena escala. Seus sistemas de produ??o ainda n?o foram intensivamente estudados, bem como estudos b?sicos envolvendo as muitas esp?cies e variedades ainda est?o por ser feitos. Sistemas de produ??o que conciliem viabilidade econ?mica com baixo impacto ambiental, devem ser desenvolvidos para esse grupo de plantas, visto que se adaptam a uma gama de condi??es ambientais, incluindo sombreamento. Estudos de ambi?ncia combinados aos de nutri??o mineral s?o necess?rios para se entender e aperfei?oar uma forma de floricultura tropical integrada a outras esp?cies, em diferentes condi??es edafoclim?ticas. Um exemplo ? o sistema de cultivo em al?ias, objeto deste estudo. Este trabalho teve como objetivo avaliar o comportamento do hibrido natural Golden Torch (Heliconia psittacorum L x Heliconia spathocircinada Aristigueta) cultivada sob sistema de cultivo em al?ias formadas por dois tipos de leguminosas arbustivas: guandu (Cajanus cajan (L.) Millsp.) e flem?ngia (Flemingia macrophylla), e um controle sem forma??o de al?ias. Combinou-se ainda, dois tipos de aduba??o de plantio: com e sem termofosfato magnesiano (Yoorin Master 1). O experimento foi conduzido nas condi??es da Baixada Fluminense no Campus da UFRRJ, Departamento de Fitotecnia, num delineamento de parcelas subdivididas em blocos ao acaso. Houve menor mortalidade de plantas nas al?ias formadas por guandu quando comparada com as formadas por flem?ngia ou no tratamento controle. A aplica??o de termofosfato n?o teve qualquer efeito. A maior produtividade de infloresc?ncias ocorreu nas al?ias formadas por flem?ngia, seguida pelo guando e a testemunha. A adi??o de termofosfato n?o afetou a produ??o de infloresc?ncias. O n?mero de perfilhos, foi afetado pela posi??o da planta na parcela: as da linha central tenderam a ter mais perfilhos do que as laterais. A ?rea foliar das plantas de helic?nia foi maior nos tratamentos com termofosfato, independentemente do tipo de al?ia.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-08-28T14:10:07Z No. of bitstreams: 1 2014 - Karla Emanuelle Campos Araujo.pdf: 681239 bytes, checksum: 370286856e74db8636cdc28b6d35e0b6 (MD5) / Made available in DSpace on 2017-08-28T14:10:07Z (GMT). No. of bitstreams: 1 2014 - Karla Emanuelle Campos Araujo.pdf: 681239 bytes, checksum: 370286856e74db8636cdc28b6d35e0b6 (MD5) Previous issue date: 2014-07-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / ARAUJO, Karla Emanuelle Campos. Isotopic fractionation of 15N in nitrogen fixation in soybean due to light intensity and Bradyrhizobium spp. strain inoculated. 2014. 40f. Dissertation (Master in Plant Science). Institute of Agronomy, Department of Plant Science, Federal Rural University of Rio de Janeiro, Serop?dica, RJ, 2014. This work aimed to study the isotopic fractionation of N from BNF in stems function and light intensity in soybean plant symbiosis with Bradyrhizobium. The 'B' value was evaluated for ten Bradyrhizobium strains, as well as their interaction with the soybean plant (Glycine max L.). The experiment was conducted at Embrapa greenhouse Agrobiologia, Serop?dica, RJ. The soybean plants inoculated with the different strains of Bradyrhizobium and a control not inoculated, were grown under conditions similar to Leonard vessels using substrate of sand and vermiculite in a 2: 1 (v / v). In the second experiment to assess the value 'B' of the resulting symbiosis BNF among cultivars (cv) of soybean BRS 133, BRS 184, MONSOY9144 nine Bradyrhizobium. Soybean plants in all the treatments, were grown under the same conditions, the soybean cultivation was performed in vessels Leonard with sand and perlite substrate in the proportion 1: 1 (v / v). In both experiments after 47 days of planting the plants were harvested and calculated the value 'B'. In the third experiment evaluated the effect of different strains of Bradyrhizobium and the reduction in the intensity of light on natural abundance of 15N N2 fixed by the strains in symbiosis with soybean cv BRS 133. An experiment was conducted in the experimental field of Embrapa Agrobiology. The soybean plants inoculated with 11 Bradyrhizobium and treatment uninoculated were grown under similar conditions in plastic pots with sand substrate and pearlite in the proportion 1: 1 (v / v) .After 75 days after planting the plants were collected and calculated the value 'B'.No experiment 1, the values of ?Bpa? ranged between -2 and -4 ?, according to the strain used. In experiment 2, the values of ?Bpa? showed no difference between the soybean cultivars inoculated with Bradyrhizobium as the isotopic abundance of 15N in plants grown entirely dependent on FBN. There was a tendency for the abundance of 15N values in ?Bpa? treatment of plants inoculated with strains of B. elkanii to be less negative than in the case of plants inoculated with B. japonicum. In experiment 3 the values of ?B?PA showed natural 15N abundance values significantly more negative than the shaded plants. There was a tendency for the abundance of 15N in the shoot (and values of ?Bpa?) treatment of the plants inoculated with B. japonicum strains to be less negative than in the case of plants inoculated with B. elkanii. For the determination of the 'B' value, the plants should be in the same stage of maturity that being used to sample the plants in the field, to assess the value 'B' in low light intensity conditions (green house) can lead to the result of a 'B' value less negative than that given in full sun and so probably less appropriate uses it to calculate the contribution of BNF in legume under field conditions. / ARAUJO, Karla Emanuelle Campos. Fracionamento isot?pico do 15N na fixa??o biol?gica de nitrog?nio na soja em fun??o da intensidade de luz e estirpe de Bradyrhizobium spp. inoculada. 2014. 40f. Disserta??o (Mestrado em Fitotecnia). Instituto de Agronomia, Departamento de Fitotecnia, Universidade Federal Rural do Rio de Janeiro, Serop?dica, RJ, 2014. Este trabalho teve como objetivo estudar o fracionamento isot?pico do N proveniente da FBN, em fun??o de estipes e intensidade de luz na simbiose da planta de soja com Bradyrhizobium. O valor ?B? foi avaliado para dez estirpes de Bradyrhizobium, assim como sua intera??o com a planta de soja (Glycine max, L.). Foi conduzido o experimento na casa de vegeta??o da Embrapa Agrobiologia, Serop?dica, RJ. As plantas de soja inoculadas com as diferentes estirpes de Bradyrhizobium e um controle, n?o inoculado, foram crescidas em condi??es semelhantes em vasos Leonard, utilizando substrato de areia e vermiculita na propor??o 2:1 (v/v). No segundo experimento para avaliar o valor ?B? da FBN resultante da simbiose entre as cultivares (cv) de soja BRS 133, BRS 184, MONSOY9144 e nove estirpes de Bradyrhizobium. As plantas de soja para todos os tratamentos, foram crescidas em condi??es iguais, o cultivo da soja foi realizado em vasos Leonard, utilizando substrato de areia e perlita na propor??o 1:1 (v/v). Nos dois experimentos ap?s 47 dias do plantio as plantas foram colhidas e calculou o valor ?B?. No terceiro experimento avaliou-se o efeito de diferentes estirpes de Bradyrhizobium e da redu??o na intensidade de luz sobre abund?ncia natural de 15N do N2 fixado pelas estirpes em simbiose com a cv. de soja BRS 133. Foi conduzido um experimento no campo experimental da Embrapa Agrobiologia. As plantas de soja inoculadas com 11 estirpes de Bradyrhizobium e um tratamento n?o inoculado, foram crescidas em condi??es semelhantes em vasos pl?sticos, utilizando substrato de areia e perlita na propor??o 1:1 (v/v). Ap?s 75 dias do plantio as plantas foram colhidas e calculou-se o valor ?B?. No experimento 1, os valores de ?Bpa? variaram entre -2 e -4 ?, de acordo com a estirpe usada. No experimento 2, os valores de ?Bpa? n?o apresentaram diferen?a entre as cultivares de soja inoculadas com os Bradyrhizobium quanto a abund?ncia isot?pica de 15N nas plantas crescida inteiramente dependente da FBN. Houve uma tend?ncia para a abund?ncia de 15N nos valores de ?Bpa? das plantas dos tratamentos inoculados com estirpes de B. elkanii a serem menos negativo do que no caso de plantas inoculadas com B. japonicum. No experimento 3 os valores de ?Bpa? apresentaram valores de abund?ncia natural de 15N significativamente mais negativos do que as plantas sombreadas. Houve uma tend?ncia para a abund?ncia de 15N na parte a?rea (e os valores de ?Bpa?) das plantas dos tratamentos inoculados com estirpes de B. japonicum a serem menos negativo do que no caso de plantas inoculadas com B. elkanii. Para ? determina??o do valor ?B?, as plantas devem estar no mesmo est?gio de maturidade que as que est?o sendo utilizadas para amostrar as plantas no campo, a avalia??o do valor ?B? em condi??es de intensidade de luz reduzida (casa de vegeta??o) pode levar ao resultado de um valor ?B? menos negativo do que aquele determinado em pleno sol e assim provavelmente menos apropriado utiliza-lo, para calcular a contribui??o da FBN em leguminosa em condi??es de campo.

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-09-26T17:06:38Z No. of bitstreams: 1 2015 - Erika Caitano da Silva.pdf: 1958258 bytes, checksum: 61fcc63494dc0f8b0966ba187b5280a0 (MD5) / Made available in DSpace on 2017-09-26T17:06:38Z (GMT). No. of bitstreams: 1 2015 - Erika Caitano da Silva.pdf: 1958258 bytes, checksum: 61fcc63494dc0f8b0966ba187b5280a0 (MD5) Previous issue date: 2015-07-27 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The objective of this study was to evaluate the efficiency of a fungicide of the strobilurin group in reducing soil N2O production, a potent greenhouse gas, and a possible positive effect on the N use efficiency by sugarcane. Laboratory studies were conducted to evaluate the effect of fungicide in soil fertilized with N on N2O emissions, as well as greenhouse and field experiments to study the fungicide as controller of urea and ammonium nitrate induction of N2O emissions and as an enhancer of fertilizer N use efficiency by sugarcane. In addition to the monitoring of soil N2O fluxes with static chambers sugarcane leaves were collected for analysis of soluble forms of N and nitrate reductase activity together with plant parameters to estimate yield and the efficiency of fertilizer N use. Laboratory tests revealed the fungicide was capable of reducing soil N2O emissions. Regardless of N source, the fungicide did not affect the analyses of enzymes and plant N fractions in sugarcane, but there was a downward trend of N2O fluxes in the soil treated with urea in the greenhouse experiment. In the field experiment, N2O fluxes were 6 to 89 ?g N m-2h-1, 24 to 795 ?g N m-2h-1 and 27 to 508 ?g N m-2h-1 respectively to the control (no added N), urea and urea + fungicide treatments, indicating that N2O emissions were reduced in approximately 30% by the fungicide. The treatment with ammonium nitrate did not induce N2O emissions from soil. There was no significant difference between treatments in all analyses of soluble fractions and enzyme activity. Based on the dimensions of stalks, sugarcane yield was estimated at 190 Mg ha-1for the control treatment (without added N) and at 238 Mg ha-1 for urea treatment. The application of fungicide had no effect on yield. The use of fungicide reduced soil N2O emissions, but does not induce greater N use efficiency by sugarcane / O objetivo deste trabalho foi avaliar a efici?ncia de fungicida do grupo das estrobilurinas na redu??o da produ??o de N2O no solo, um potente g?s de efeito estufa, al?m de poss?veis efeitos positivos na efici?ncia de uso de N pela cana-de-a??car. Foram conduzidos estudos em laborat?rio para avaliar o efeito do fungicida em solo fertilizado com N sobre as emiss?es de N2O, assim como um ensaio em casa de vegeta??o e outro em campo, onde se estudaram a ureia e o nitrato de am?nio, tratados ou n?o com fungicida, sobre as emiss?es de N2O e indicadores de efici?ncia de uso de N pela cana-de-a??car. Al?m do monitoramento dos fluxos de N2O com c?maras est?ticas, foram tamb?m coletadas folhas da cultura para an?lise das fra??es sol?veis de N e an?lise da enzima nitrato redutase, incluindo-se tamb?m a estimativa da produtividade e efici?ncia do uso de N. Os ensaios de laborat?rio mostraram que o fungicida aplicado ao solo reduz emiss?es de N2O. No ensaio em casa-de-vegeta??o, a an?lise de enzimas e fra??es de N na cana-de-a??car n?os e alteraram com o uso do fungicida, independente da fonte de N, mas houve tend?ncia de redu??o dos fluxos de N2O no solo tratado com ureia. No ensaio de campo, os fluxos de N2O foram de 6 a 89 ?g N m-2h-1, 24 a 795 N m-2 h-1 e 27 a 508 N m-2 h-1respectivamente para os tratamentos controle (sem adi??o de N), ureia e ureia +fungicida, indicando queda nas emiss?es de N2O de aproximadamente 30% no tratamento com fungicida.O tratamento com nitrato de am?nio n?o induziu emiss?es de N2O do solo.N?o houve diferen?a significativa entre os tratamentos em todas as an?lises das fra??es sol?veis e tamb?m na an?lise enzim?tica. A produtividade de colmos (TCH), estimada a partir das dimens?es dos colmos, variou significativamente de 190 Mg ha-1, no tratamento controle (sem adi??o de N), para 238 Mg ha-1, no tratamento com ureia, por?m a aplica??o do produto n?o influenciou na produ??o da cultura. O uso de fungicida reduz emiss?es de N2O, por?m n?o induz maior efici?ncia de uso de N pela cana-de-a??car

Submitted by Celso Magalhaes (celsomagalhaes@ufrrj.br) on 2017-09-28T12:19:16Z No. of bitstreams: 1 2014 - Mara Alexandre da Silva.pdf: 458810 bytes, checksum: 70a72dfd6d35926572affcb5392ec6f7 (MD5) / Made available in DSpace on 2017-09-28T12:19:16Z (GMT). No. of bitstreams: 1 2014 - Mara Alexandre da Silva.pdf: 458810 bytes, checksum: 70a72dfd6d35926572affcb5392ec6f7 (MD5) Previous issue date: 2014-08-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Organic production is an alternative for family farmers where practices to reduce costs and to preserve natural resources can add value to the product and improve quality of life. The weeds can cause losses in crops, by reduction of income, increase in pests and diseases, non uniformity in maturity and difficulties for harvesting. The objective of this study was to evaluate the performance of common bean cultivars (Phaseolus vulgaris) at different sowing densities regarding the incidence of weeds in organic production system. Two field experiments were conducted in the Agroecological Production Integrated System of 47 km in Serop?dica-RJ, in the years 2013 and 2014, in a randomized block design with four replications. In 2013 a 4x3 factorial was used, combining four cultivars (Ouro Negro, Manteig?o, Radiante and Apor?) and three densities (8, 13 and 18 plants m-1 linear). In 2014 a 2x3 factorial was used, between two cultivars (Manteig?o and Ouro Negro) and three treatments (13 plants m-1 with manual cleaning of weeds, 13 and 18 plants m-1 without cleaning). To obtain the desired plant population, 50% more seeds were sown in each treatment and plants were thinned 15 days after. Sampling was carried out at the flowering stage to assess biomass and nodulation of bean and biomass of weeds, and at physiological maturity to evaluate grain yield. In 2013, the largest shoot and root dry mass and number of nodules per plant occurred in the density of 8 plant m-1. Increased planting density reduced the number of pods per plant, with no effect of density on grain yield. The lower biomass of weeds was observed at densities of 13 and 18 plant m-1, and also for cutivars Manteig?o and Ouro Negro. In 2014, treatment with 13 plants m-1 with cleaning showed greater dry mass of shoots and roots per plant. At flowering, treatment with 13 plants m-1 showed higher dry matter and number of weeds. The cultivar Ouro Negro showed higher grain yield at density of 13 plants m-1 with cleaning, followed by 18 plants m-1, with no differences between treatments for cultivar Manteig?o. The treatment with 18 plants m-1 showed lower mass of weeds at bean flowering, similar to the treatment with 13 plants m-1 with cleaning. Plots with cultivar Manteig?o had the highest dry matter of weeds in the three density treatments. Grain yield did not differ significantly among cultivars, ranging in 2013 from 1310 kg ha-1 for Apor? and 1409 kg ha-1 for Manteig?o, and in 2014 of 1298 and 1419 kg ha-1 for Manteig?o and Ouro Negro. It is concluded that increasing plant density reduced the incidence of weeds and did not affect grain yield. It was also carried out a field trial in 2013 in family agricultural establishment in the city of Teresopolis-RJ, in order to encourage the cultivation of special beans and to experience economic and social strategies of reproduction. The experiment had a 4x2 factorial with four replications, using four cultivars (Apor?, Manteig?o, Radiante and Valente) and two treatments (with and without commercial inoculant with rhizobia). Grain yield of the four cultivars did not differ between the treatments in the absence and presence of seed inoculation with rhizobia / A produ??o org?nica constitui uma alternativa para a agricultura familiar, onde pr?ticas para diminuir os custos de produ??o e preserva??o dos recursos naturais agregariam valor ao produto e qualidade de vida. As plantas espont?neas podem causar perdas em cultivos, pela redu??o do rendimento, aumento de pragas e doen?as, desuniformidade na matura??o e dificuldades na colheita. O objetivo deste trabalho foi avaliar o desempenho de cultivares de feijoeiro comum (Phaseolus vulgaris) em diferentes densidades de semeadura, com rela??o ? incid?ncia de plantas espont?neas em sistema org?nico de produ??o. Foram conduzidos dois experimentos de campo no Sistema Integrado de Produ??o Agroecol?gica do km 47, em Serop?dica-RJ, nos anos de 2013 e 2014, em blocos ao acaso com quatro repeti??es. Em 2013 foi utilizado esquema fatorial 4x3, combinando quatro cultivares (Ouro Negro, Manteig?o, Radiante e Apor?) e tr?s densidades (8, 13 e 18 plantas m-1 linear) e em 2014 utilizou-se esquema fatorial 2x3, entre duas cultivares (Manteig?o e Ouro Negro) e tr?s tratamentos (densidade de 13 plantas m-1 com limpeza manual de plantas espont?neas, densidades de 13 e 18 plantas m-1 sem limpeza). Para obten??o da popula??o desejada, foram semeadas 50% mais sementes em cada tratamento, e 15 dias ap?s realizou-se desbaste. Foram efetuadas amostragens no est?dio de flora??o para avalia??o de biomassa e nodula??o do feijoeiro e da biomassa de plantas espont?neas, e na matura??o fisiol?gica para avalia??o do rendimento. Em 2013, a maior massa seca de parte a?rea e raiz e n?mero de n?dulos por planta ocorreu na densidade de 8 plantas m-1. O aumento da densidade de plantio reduziu o n?mero de vagens por planta, sem efeito da densidade na produtividade de gr?os. A menor massa de plantas espont?neas foi observada nas densidades de 13 e 18 plantas m-1, e com as cultivares Manteig?o e Ouro Negro. Em 2014, o tratamento com 13 plantas m-1 com limpeza apresentou maior massa seca de parte a?rea e raiz por planta. Na flora??o, o tratamento com 13 plantas m-1 sem limpeza apresentou maior massa seca e n?mero de espont?neas. A cultivar Ouro Negro apresentou maior produ??o de gr?os no tratamento de 13 plantas m-1 com limpeza, seguida por 18 plantas m-1, sem diferen?as entre tratamentos na cultivar Manteig?o. O tratamento com 18 plantas m-1 apresentou menor massa de espont?neas na flora??o do feijoeiro, similar a 13 plantas m- 1 com limpeza. A cultivar Manteig?o apresentou maior massa de espont?neas nos tr?s tratamentos. A produ??o de gr?os n?o diferiu significativamente entre as cultivares, variando em 2013 entre 1310 kg ha-1 para Apor? e 1409 kg ha-1 para Manteig?o, e em 2014 com 1298 e 1419 kg ha-1 para Manteig?o e Ouro Negro. Conclui-se que o aumento da densidade de plantio reduziu a incid?ncia de plantas espont?neas e n?o afetou a produtividade de gr?os do feijoeiro. Foi tamb?m conduzido um experimento de campo em 2013 em estabelecimento agr?cola familiar no munic?pio de Teres?polis-RJ, com o objetivo de incentivar o cultivo de feij?es especiais e vivenciar estrat?gias de reprodu??o econ?mica e social. O experimento tinha esquema fatorial 4x2 com quatro repeti??es, entre quatro cultivares (Apor?, Manteig?o, Radiante e Valente) e dois tratamentos (com e sem uso de inoculante comercial de riz?bio). A produ??o de gr?os das quatro cultivares n?o diferiu entre os tratamentos na aus?ncia e na presen?a de inocula??o de sementes com riz?bio.