Made available in DSpace on 2016-08-11T14:41:29Z (GMT). No. of bitstreams: 1 KalinaBM_DISSERT.pdf: 1464384 bytes, checksum: 3b7e0558a50096ee252c3e73ce566c0e (MD5) Previous issue date: 2014-12-10 / Historically, innovation is considered a key element for competitiveness and economic growth of countries, and contribute to face the emerging challenges, such as increased global demand for food, social inequality and climate change. Following this logic, the Brazilian government adopted a policy of science, technology and innovation (ST & I), supported by qualified for the generation of new knowledge and technologies focused on biotechnology research human resources. The proceeds from the Agribusiness Sector Fund (CT-Agro), not only ensure the leadership of Brazil in world trade in agricultural commodities, as has been contributing to the increase in per capita income from the northeastern states. Thus, considering the dynamism of the state of Rio Grande do Norte in the horticulture sector, the purpose of this study was to analyze the contribution of the CT -Agro resources for the growth of the state and to improve the social and environmental indicators. In the methodology, we adopted a model of linear regression with panel data to estimate the average effects of elasticity (CT-Agro) explanatory variable with respect to per capita GDP (dependent variable). Funds invested in agribusiness, in the period from 2000 to 2009, among the 27 states, corresponding to a sample of 270 observations were analyzed. Among the statistical methods used to estimate the coefficients, Method of Fixed Effect, was the most suitable for the large adjustment of the data (R2 = 99%). The results showed, however, that resources for agribusiness cause positive effects to increase the income of the Natal economy. It can be concluded that investments in STI, give greater dynamism and efficiency in the production chain, and may be reflected in social and environmental benefits / Historicamente, a inovação é considerada elemento-chave para à competitividade e o crescimento econômico dos países, além de contribuir para o enfrentamento dos desafios emergentes, como o aumento da demanda mundial por alimentos, as desigualdades sociais e as mudanças climáticas. Seguindo essa lógica, o governo brasileiro adotou uma política de ciência, tecnologia e inovação (CT&I), amparada em recursos humanos capacitados para a geração de novos conhecimentos e de tecnologias voltadas à pesquisa biotecnológica. Os recursos provenientes do Fundo Setorial do Agronegócio (CT-Agro), não apenas asseguram a liderança do Brasil no comércio mundial de commodities agrícolas, como vem contribuindo para o aumento da renda per capita dos estados nordestinos. Assim, considerando o dinamismo do estado do Rio Grande do Norte, no setor da fruticultura, a finalidade deste trabalho foi analisar a contribuição dos recursos do CT-Agro para o crescimento do estado e para a melhoria dos indicadores sociais e ambientais. Na metodologia, adotou-se um modelo de regressão linear, com dados em painel, para estimar os efeitos médios da elasticidade da variável explanatória (CT-Agro) com relação ao PIB per capita (variável dependente). Foram analisados os recursos aplicados no agronegócio, no período de 2000 a 2009, entre os 27 estados brasileiros, correspondendo a uma amostra de 270 observações. Entre os métodos estatísticos utilizados para a estimativa dos coeficientes, o Método dos Efeitos Fixos, foi o mais adequado por apresentar um maior ajustamento dos dados (R2= 99%). Os resultados demonstraram, portanto, que os recursos destinados ao agronegócio provocam efeitos positivos para o aumento da renda da economia potiguar. Pode-se concluir, que os investimentos em CT&I, conferem um maior dinamismo e eficiência a cadeia de produção, podendo se refletir em benefícios sociais e ambientais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Human activities have altered the environmental quality especially with regard to water sources. The agro-industry activity in small scale may represent a potential pollutant different from those of other agricultural activities, and, therefore, there is the need to search alternatives to minimize its impacts. This work aims to: (a) assess the quality and quantity of waste solid and liquid Small Scale Agroindustry Family (b) characterize the Small Scale Agro-industry Family in the types of waste and pollution potential, (c) assess the impacts of Small Scale Agro-industry Family in the quality of surface water, and (d) evaluate the efficiency of a simplified treatment of liquid waste. The study was conducted in agricultural members of the group "Rede da Casa; Network Home" of the Fourth Region of the Colony of Italian immigration of Rio Grande do Sul. The thesis was divided into three studies: the first study addressed the characterization of family agro-industry of small scale, the second assessed the impact of agricultural practices on water quality of four streams, and the third addressed the treatment of poultry slaughter waste, production of cheeses, and wines and juices. The waterways are contaminated along the way within the property by different sources of contamination. The Small Scale Agro-industry Family is just one activity that can contribute to poor environmental quality. There is production of organic residues in Small Scale Agro-industry Family, both in liquid and solid form. These have low negative impacts released directly into the environment. The root zones of plants are efficient in the removal of organic and biological contaminants, but constant maintenance must be made. For some types of waste, it is essential to have flotation and deposition tanks and physical filtration tank. / As atividades antrópicas têm alterado a qualidade ambiental principalmente no que se refere aos mananciais de água. As atividades agroindustriais em escala de pequeno porte podem representar potencial poluidor diferentes daquelas das demais atividades agrícolas, e, portanto, há necessidade de propor alternativas para minimizar seus impactos. Este trabalho tem como objetivos: (a) avaliar qualitativa e quantitativamente os resíduos sólidos e líquidos de agroindústrias familiares de pequeno porte; (b) caracterizar as agroindústrias quanto aos tipos de resíduos e o potencial poluidor; (c) avaliar os impactos das agroindústrias na qualidade das águas superficiais; e (d) avaliar a eficiência de sistema simplificado de tratamento de resíduo líquido. O trabalho foi realizado nas agroindústrias integrantes do grupo Rede da Casa da Região da Quarta Colônia de Imigração Italiana do Rio Grande do Sul. A dissertação de mestrado foi organizada em três estudos: o primeiro estudo abordou a caracterização das agroindústrias familiares; o segundo avaliou o impacto das atividades agroindustriais na qualidade de água de quatro córregos; e o terceiro abordou o tratamento de resíduos de abatedouro de aves, de produção de queijos e de vinhos e sucos. Os cursos de água são contaminados ao longo do percurso dentro da propriedade por diferentes fontes de contaminação. A agroindústria é apenas mais uma atividade que pode contribuir para a má qualidade ambiental. Há produção de resíduos orgânicos nas agroindústrias familiares de pequeno porte, tanto na forma líquida ou sólida, e esses apresentam baixos impactos negativos se lançados diretamente no ambiente. As estações de tratamento por zona de raízes são eficientes na remoção da carga orgânica e de contaminantes biológicos, mas devem ser feitas manutenções constantes e, para alguns tipos de resíduos, é fundamental a presença de tanques de deposição e flutuação e tanques de filtração física.

Les objectifs de cette thèse étaient (i) d'étudier les mécanismes par lesquels les nématodes bactérivores régulent les flux de nutriments (N et P) dans la rhizosphère du riz pluvial dans un sol ferrallitique de Madagascar, (ii) d'étudier les effets des interactions bactéries – bactérivores sur les fonctions de la plante (croissance et nutrition), et (iii) d'évaluer les principaux facteurs contrôlant la boucle microbienne des sols dans une optique d'intensification. Notre modèle biologique comprenait Acrobeloides sp. (Cephalobidae) et Oryza sativa (Poaceae).Deux voies ont été proposées pour expliquer les effets positifs des bactérivores sur la disponibilité des nutriments et les fonctions de la plante: voie de minéralisation et voie d'exploration. Afin d'identifier l'implication de chaque voie dans les flux de P inorganique à l'interface sol-plante nous avons utilisé le radio-isotope 32P comme traceur. Lorsque le pH du sol est corrigé par l'ajout de dolomie, la présence des nématodes bactérivores améliore la minéralisation nette de P, la production de biomasse et la nutrition de la plante sans modifier la ramification du système racinaire, contrairement à ce qui a été observé par certains auteurs en présence de protistes. En effet, en présence de nématodes et de dolomie, la L-value dans les parties aériennes de la plante augmente de 49%, la biomasse totale de la plante augmente de 22%, et la quantité de P total dans les tissus de la plante augmente de 9%. Ainsi, Acrobeloides sp. stimule le prélèvement de P par la plante via la voie nutritionnelle ou voie de minéralisation.Les effets de Acrobeloides sp. sur les fonctions de la plante sont variables (positives, neutres, négatives), en fonction des pratiques agricoles et des caractéristiques abiotiques du sol. Tout d'abord, ces effets peuvent dépendre de la variété de riz puisque l'attractivité des nématodes Acrobeloides sp. par la rhizosphère du riz varie en fonction des variétés de riz pluvial, plus précisément en fonction de la composition et de la quantité d'exsudats racinaires libérés par la plante. Ensuite, l'activité mutualiste des nématodes est influencée (maximisée) par la présence d'arbres (agroforesterie) dans la parcelle de riz pluvial. En plus des plantes, les paramètres édaphiques étaient des facteurs clés. L'activité mutualiste des nématodes est fortement limitée par le pouvoir fixateur des Ferralsols. Ainsi, l'ajout de dolomie limite la capacité de sorption de P du sol et améliore l'activité mutualiste des nématodes bactérivores. Enfin, l'activité mutualiste des nématodes sur la croissance et la nutrition du riz pluvial est favorisée par les valeurs élevées de pH et de teneur en Mg dans le sol. Pour conclure nous avons trouvé qu'il est possible d'intensifier l'activité mutualiste des nématodes bactérivores dans un sol tropical pauvre à travers des pratiques agricoles spécifiques (gestion des sols, agroforesterie). / Using Acrobeloides sp. (Cephalobidae) and Oryza sativa (Poaceae), we aimed at (i) studying the effects of bacterivorous nematodes on plant functions growing in a nutrient-poor soil in Madagascar, (ii) testing the mechanisms involved in the mutualistic activity of the bacterivorous nematodes in a strong P-depleted Ferralsol from the highlands of Madagascar, and (iii) identifying the agronomic and edaphic factors that can drive the soil microbial loop.Two pathways have been proposed to explain the positive effects of bacterial-feeders on nutrients availability and plant functions: mineralization pathway and exploration pathway. In order to test the involvement of each pathway in the mutualistic activity of bacterivorous nematodes, we assessed the effect of nematodes inoculation on inorganic P flows from soil to plant using the 32P labelling technique. When the soil pH was corrected with dolomite lime, we showed that the presence of Acrobeloides sp. improved net P mineralization and plant (Oryza sativa) functions (growth and nutrition) but did not alter lateral root growth as protists do. Indeed, in the presence of nematodes and dolomite, the shoot L-value increased by 49%, the plant total biomass increased by 22% and the plant total P amount increased by 9%. Thus, Acrobeloides sp. increased plant P uptake through the "nutritional" or "mineralization" pathway.The effects of Acrobeloides sp. on Oryza sativa functions were variable (positive, neutral or negative) according to agricultural practices and soil abiotic variables. First, these effects may depend on the rice cultivar used in the experiment. Indeed, the nematodes attractancy to root-adhering soils varied according to upland rice cultivar, probably according to the amount and composition of root exudates. The mutualistic activity of nematodes is also influenced (maximized) by the presence of trees (agroforestry) in the rice field. Besides plants, the abiotic soil parameters were key drivers. The mutualistic activity of nematodes was strongly limited by the ability of Ferralsols to precipitate and chemisorb phosphates. The addition of dolomite lime limited phosphates sorption on soil and enhanced the mutualistic activity of the nematodes. Also, the high values of soil pH and Mg content tended to increase the mutualistic activity of the bacterivorous nematodes on rice growth and nutrition. To conclude, we found that it is possible to drive the mutualistic activity of bacterivorous nematodes in poor tropical soils through specific soil and agricultural practices.

O agronegócio, a cada dia recebe incremento de novas tecnologias, o que lhe confere lugar de destaque no Produto Interno Bruto (PIB) do Brasil. Tal como qualquer outra atividade humana, os setores agrícola e pecuário são geradores de resíduos e, potencialmente, produtores de impactos ambientais. Prever, avaliar e remediar os impactos ambientais são necessidades imperiosas para sustentabilidade de uma atividade e proteção dos ecossistemas. A Empresa Brasileira de Pesquisa Agropecuária (Embrapa) produziu um instrumento de avaliação de impacto ambiental da inovação tecnológica agropecuária, denominado Ambitec-Agro. Entre um vasto campo de inovações tecnológicas, este trabalho foca a Integração Lavoura-Pecuária, que visa recuperar áreas de lavouras degradadas, usar eficientemente a terra, recuperar e renovar pastagens degradadas, ou seja, promover sustentabilidade agropecuária. O presente trabalho aplicou o Ambitec-Agro na unidade experimental: Fazenda Capivara, que abriga a Embrapa Arroz e Feijão, no estado de Goiás. A metodologia propõe realizar entrevista para obtenção de dados; para este trabalho foram entrevistados pesquisadores da Embrapa Arroz e Feijão, Cerrados e Sede. Este trabalho acadêmico propôs, por meio de estudo de caso, avaliar os impactos promovidos pela inovação tecnológica do binômio integrado lavoura-pecuária em área de sequeiro e irrigada, com o uso do Ambitec-Agro. Os coeficientes de impacto ambiental da Integração lavoura-pecuária tanto em área de sequeiro quanto em área irrigada indicam que a inovação tecnológica contribui positivamente para a sustentabilidade da atividade produtiva no âmbito do estabelecimento estudado. / The agribusiness has been taking advantage of new technologies becoming prominent in the Brazilian Gross Domestic Product (GDP). Like any other human activity, the practice of agriculture and cattle raising produces waste, and as a result it can create environmental impact. Therefore, it is necessary to assess, predict, and lessen the environmental impact for the sustainability of this activity and for the ecosystems protection. The Brazilian Agricultural Research Agency (Embrapa) has proposed a system, the environmental impact assessment of agricultural technology innovations(Ambitec-Agro), focusing on the agriculture-cattle raising integration which aims at improving the production of farming products in areas already deteriorated; intensifying the use of land; and recuperating and renovating agricultural areas and pastures already deteriorated to guarantee agricultural sustainability. Thus, this study adopts the Ambitec-Agro system in the experimental unit Capivara Farm, which comprises the National Rice and Beans Research Center (Embrapa Arroz e Feijão) in the state of Goiás. This methodology proposes carrying out interviews in order to obtain data. Researchers at National Rice and Beans Research Center (Embrapa Arroz e Feijão), Embrapa Cerrados (Cerrados), and Embrapa Headquarters (Sede), were interviewed. Based on a case study, this work aimed at the assessment of the environmental impact created by technology innovation of the agriculture-cattle raising integration in unirrigated and irrigated areas by applying the Ambitec-Agro system. The environmental impact of agriculture-cattle raising integration coefficients, in both unirrigated and irrigated areas, demonstrate that technology innovation contributes effectively to the sustainability of this productive activity in the area studied.

Made available in DSpace on 2016-06-02T19:49:58Z (GMT). No. of bitstreams: 1 TeseMS.pdf: 1818780 bytes, checksum: 7b414877086b02e1714122ec5f260ad2 (MD5) Previous issue date: 2006-12-19 / The role of the agribusiness has been extremely important in the context of the Brazilian production in terms of both economic values and employment generation. However, the agribusiness specific characteristics have not been sufficiently considered in the literature and even in the development of Production Planning and Control Systems. This thesis is an attempt to fulfill this lack. Two basic aspects were taken into consideration. First, the thesis provides a classification system that allows for identifying those enterprises according to their special characteristics. Second, the architecture of a Planning and Control System is proposed in order to address the main needs of agri-industries, which are dedicated to the raw material splitting up, such as slaughterhouses and mills. In that architecture, it is particularly taken into account demand forecasting and raw material availability restriction. Also, a rule of master production scheduling have been built taking into consideration the simultaneous generation of co-products, which can or not to be immediately needed. / A agroindústria tem-se mostrado um segmento extremamente importante no contexto produtivo, particularmente no Brasil, seja em relação aos valores econômicos envolvidos, seja na geração de empregos diretos e indiretos. Entretanto, suas peculiaridades não têm sido suficientemente consideradas na literatura e mesmo no desenvolvimento de sistemas de Planejamento e Controle da Produção. Assim, esse trabalho visa resgatar essas preocupações, contribuindo basicamente em dois aspectos. O primeiro é a constituição de um sistema de classificação que permite identificar esses empreendimentos segundo suas particulares características constitutivas. O segundo é a proposição de uma arquitetura para o sistema de Planejamento e Controle da Produção, voltado para as principais necessidades da parcela de empreendimentos agroindustriais dedicados ao fracionamento da matéria-prima alimentar, tais como abatedouros e moageiras. Nessa arquitetura é particularmente destacada a preocupação com a previsão de demanda, associada à restrição de disponibilidade da matéria-prima, bem como a constituição do programa mestre de produção, considerando a geração simultânea de coprodutos, que podem ou não ser imediatamente desejados.

Made available in DSpace on 2016-12-08T16:44:33Z (GMT). No. of bitstreams: 1 PGPV10MA034.pdf: 1439904 bytes, checksum: 4db5cc7ffec224395655a5207d466072 (MD5) Previous issue date: 2010-12-08 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Tomato plants (Solanum lycopersicum L.) cultivated under conventional production systems are frequently disturbed by insects and diseases. Synthetic organic pesticides that are used to manage tomato crops have been harmful to human being and environment as well. Fruits of tomato are very sensitive to handling and its quality is highly influenced by the crop system and post-harvest practices. The objective of this research was to evaluate the effect of high dilution preparations to manage pest and disease, and post-harvest conservation of tomatoes under organic production systems. Experiments were conducted as follow: a) Two experiments under field conditions; b) one experiment in greenhouse; c) one bio-assay concerning post-harvesting; d) twelve bio-assays in vitro conditions. The experiments were conducted in the Lages Experimental Station area of EPAGRI and at Centro Agroveterinario of University of Santa Catarina State, SC. Treatments consisted of high dilutions of Staphysagria, Arsenicum album, Sulphur at 12CH (centesimal hahnemaniana dilution), and Arnica montana, Sulphur, tomato, and jua (Solanum aculeatissimum), nosodes at 12 and 24DH. Bourdoux mixture at 0.3%, Cupric formulation EEC at 50 ppm, and Bacillus thuringiensis were included as standard treatments. Data were from field experiments consisted of septoriosis incidence (Septoria lycopersici), insect occurrence, damage caused by Agathomerus sellatus, yields, and fruit quality attributes. Data analysis was performed throughout statistical package. Results showed that Staphysagria 12CH and Arnica Montana 12DH could increase tomato fruit weigh. Damage caused by tomato caterpillars were reduced by spraying Sulphur 12CH and Bacillus thuringiensis. B. thuringiensis reduced also the incidence of septoriosis. High dilution preparation interfered to insect occurrence and reduced the damage of Agathomerus sellatus in the stages of larvae and adults. Tomato plants treated by jua nosodes at 12 and 24CH increased the SST (° Brix) contents, which gives better qualities of processing and palatability, as well. In the greenhouse experiment, it was evaluated the treatments of Arnica montana, Sulphur, tomato and jua nosodes, all at 12 and 24DH dinamization. Bourdoux mixture at 0.3% and cupric formulation EEC at 50 ppm were considered as standard treatments. It was observed that tomato nosodes at 12DH and 24DH supressed the septorioris incidence. In the post-harvest bio-assay, fruits were treated with Calcarea carbonica at 6, 12, 24CH dinamizations. The evaluation was concerning chemical contents and physical attributes. Calcarea carbonica post-harvest treatment did not affected the acidity, SST (° Brix), hardness or the weight losses of tomato fruits. However, Calcarea carbonica 24CH delayed the fruit maturation in such way that the kind sauce fruit was reduced. In the laboratory bio-assays the follow high dilution preparations were studied: Staphysagria, Arsenicum album, and Nitricum acidum at 6, 12, 25, 30, 50, 60, 80, and 100CH 11 dinamizations. All preparations were tested in two media combined by two application methods into Petry dishes with colonies of the fungus Alternaria solani. Bioassay was studied by measuring the diameter of the colonies. The measurements were made from 24h until the 10th day after install the assays. It was observed that the media with basic composition were more suitable to screening high dilution preparations against A. solani before to test in the field. The application method of high dilution preparations over the fungus colony was better than incorporated one. The use of high dilution preparations has the potential effect to replace pesticide used on tomato crops and it would be a suitable management strategy to fill legal requirements for organic production systems. / O tomateiro (Solanum lycopersicum L.) sob sistema de produção convencional está constantemente sujeito à pragas e doenças. Pesticidas orgânicos sintéticos usados para seu manejo podem causar graves pertubações ao meio ambiente e a saúde humana. Frutos de tomateiro também são sensíveis ao manuseio e sua qualidade é afetada pelo sistema de cultivo e pelas práticas de conservação pós-colheita. O objetivo deste trabalho foi avaliar o efeito de preparados em altas diluições no manejo fitossanitário e pós-colheita da cultura do tomateiro sob sistema orgânico de produção. Foram conduzidos (a) dois experimentos em condições de campo, (b) um experimento em casa de vegetação, (c) um ensaio de conservação pós-colheita em laboratório e (d) doze bioensaios in vitro. Os experimentos foram conduzidos na Estação Experimental da EPAGRI de Lages e, no Centro de Ciências Agroveterinárias da UDESC. Os tratamentos avaliados nos experimentos a campo foram os preparados em altas diluições de Staphysagria, Arsenicum album, Sulphur na dinamização 12CH (centesimal hahnemaniana); Arnica montana, Sulphur, nosódios de tomateiro e de juá (Solanum aculeatissimum), nas dinamizações 12 e 24DH (decimal hahnemaniana). Calda bordalesa 0,3%, Calda cúprica EEC a 50 ppm e Bacillus thuringiensis foram incluídos em doses ponderais e considerados tratamentos padrões. Nos experimentos a campo avaliou-se a incidência de septoriose (Septoria lycopersici), ocorrência e danos por insetos, produtividade e atributos químicos de qualidade dos frutos. A análise dos dados mostrou que os preparados Staphysagria 12CH e Arnica montana 12DH proporcionaram a maior peso de frutos. Danos causados por brocas foram reduzidos com a aplicação de Sulphur 12CH igualando a Bacillus thuringiensis. B. thuringiensis também reduziu a incidência de septoriose. Observou-se que os preparados em altas diluições interferiram na ocorrência de insetos em plantas de tomateiro e reduziram os danos causados por Agathomerus sellatus, tanto na fase larval quanto na fase adulta. Tomateiros tratados com nosódio de juá 12 e 24DH tiveram incremento no teor de SST (° Brix) dos frutos, atributo que melhora a palatabilidade e a qualidade para a industrialização. No experimento em casa de vegetação, avaliou-se Arnica montana, Sulphur, nosódios de tomateiro e de juá, nas dinamizações 12 e 24DH. Calda bordalesa 0,3% e calda cúprica EEC a 50 ppm também foram incluídas em doses ponderais e considerados tratamentos padrões. Observou-se que o nosódio de tomateiro na 12DH e 24DH suprimiram a incidência de septoriose nas plantas tratadas. No ensaio em laboratório de conservação pós-colheita, frutos foram tratados com Calcarea carbonica nas dinamizações 6, 12, 24CH. Avaliou-se atributos químicos e físicos dos frutos. Calcarea carbonica em tratamento pós-colheita não interferiu na acidez, SST (° Brix), firmeza e perda de massa fresca dos frutos. Embora, Calcarea9 carbonica 24CH retardasse a formação de frutos do tipo molho. Nos estudos in vitro foram avaliados os preparados Staphysagria, Arsenicum album e Nitricum acidum nas dinamizações 6, 12, 25, 30, 50, 60, 80 e 100CH, em meios de cultivo básico e enriquecido e, em dois métodos de aplicação. Nos bioensaios foi avaliado o diâmetro das colônias do fungo Alternaria solani iniciando-se 24 horas após a instalação do ensaio e estenderam-se até o décimo dia. Observou que meios de cultivo com composição básica foram mais adequados para o screening de preparados em altas diluições e suas dinamizações, em estudos in vitro com A. solani. A aplicação dos preparados em altas diluições sobre a colônia do fungo foi o método mais adequado para estudos in vitro. Preparados em altas diluições tem potencial para serem eficazes na substituição de agrotóxicos que são utilizados na cultura do tomateiro, e poderiam ser adequados para preencherem requisito legal em sistemas orgânicos de produção

Tomando como base o instrumental analítico desenvolvido na Geografia, particularmente na Geografia Humana, esta dissertação apresenta uma análise de algumas feiras agroecológicas organizadas por camponeses de assentamentos e comunidades rurais localizadas na Paraíba. A investigação de aspectos relativos ao processo de formação das feiras agroecológicas analisadas, bem como de elementos específicos da organização, produção e comercialização, levou-nos a considerá-las enquanto uma estratégia configurada pelos camponeses e assessores técnicos com o propósito de viabilizar a superação de adversidades no processo produtivo e de circulação da produção agrícola. Desta maneira, como decorrência da própria investigação empreendida, as feiras agroecológicas foram equacionadas como produto de um esforço dos camponeses paraibanos dirigido à superação de mecanismos de subordinação ao capital comercial e industrial no campo. Ao constituírem-se como formas de insubordinação camponesa, as feiras agroecológicas estudadas contribuíram, em grande medida, para viabilizar um maior controle dessa parcela do campesinato sobre o trabalho familiar e seus frutos, materializando assim frações territoriais dotadas de importantes especificidades. / Taking as base the analytical instrumental developed in the Geography, particularly in the Human Geography, this work presents an analysis of some agro-ecological fairs organized by peasants of settlements and rural communities located in Paraiba. The investigation of relative aspects to the process of formation of the agro-ecological fairs analysed, as well as of specific elements of the organization, production and marketing, made us consider them as a strategy shaped by the peasants and technical advisers with the purpose of making feasible the overcoming of adversities in the productive process and, also, of circulation of the agricultural production. In this way, as a consequence of the undertaken investigation, the agro-ecological fairs were equated as a result of an effort of the peasants from Paraíba guided to the overcoming of mechanisms of subordination to the commercial and industrial capital in the countryside. Constituted as ways of peasants insubordination, the agro-ecological fairs studied contributed, in great measure, to make feasible a major control of this portion of the peasantry on the familiar work and its products, materializing, in this manner, territorial fractions composed by important specificities.

Dans l’ensemble des cinq massifs préalpins français septentrionaux auquel il appartient, le massif des Bornes-Aravis présente un trait distinctif qui intrigue : celui de ne comporter qu’une réserve naturelle très restreinte, située sur la marge lacustre. En cela, il se démarque de ses homologues et voisins, dotés de vastes parcs naturels régionaux et de géoparcs, garants du maintien d’un cadre de vie de qualité. Rétifs à toute mesure de protection territoriale, les élus locaux affirment que l’empirisme guidé par la sagesse, ainsi que le savoir-être traditionnel des populations locales, se substituent avantageusement à l’établissement d’espaces protégés dont les effets seraient, à leurs dires, préjudiciables au développement économique. Dans ce contexte, on est fondé à éprouver quelques craintes quant à la pérennité de l’esthétique paysagère, qui constitue le facteur indispensable à l’attractivité touristique, moteur essentiel de l’économie alpine. On peut aussi s’interroger sur les chances de voir se maintenir une situation de « double mise en valeur équilibrée » (Bätzing, Rougier, 2006). Bien que s’adaptant volontiers aux impératifs de l’économie contemporaine, la société locale a su jusqu’ici limiter l’altération de sa culture et de son patrimoine naturel. En témoigne un système agro-pastoral dynamique et relativement prospère, indispensable au maintien de la qualité du cadre de vie. Les habitants des Bornes-Aravis déclarent vouloir éviter que leur massif ne devienne un espace de loisirs pour citadins. Les schémas de cohérences territoriales récemment élaborés prennent en compte ces enjeux.L’analyse menée tout au long de cette étude portera une attention toute particulière à l’évolution des dynamiques spatiales influant sur le devenir de la beauté paysagère, qui constitue la richesse essentielle de ces montagnes de moyenne altitude. Celle-ci devrait être valorisée notamment par une médiation scientifique non pas sporadique et fragmentaire telle qu’elle l’est actuellement, mais conçue selon une cohérence en lien avec l’identité du territoire. / Of the five northern french pre-Alpine ranges to which it belongs, the mountains of Bornes-Aravis has a distinctive feature that is intriguing: it has only a very small nature reserve situated on the fringes of Lake Annecy. In this it differs from larger neighboring parks, and more recently, geoparks, all guarantee of maintaining a high quality of life.Reluctant to adopt any measure of territorial protection, local officials say that empiricism guided by wisdom, and traditional know-how of native populations, outweigh the establishment of protected areas whose effects would be prejudicial to their priority of economic development. In this context, it is reasonable to harbour fears about the sustainability of landscape aesthetics, which is an essential factor attracting tourists, a key driver of the alpine economy. Native societies readily adapting to the demands of the modern economy, whilst limiting alterations to their cultural and natural heritage. As a result of that process, one can notice the existence of a dynamic and relatively prosperous agro-pastoral system, essential to maintaining the quality of life. The inhabitants of the country say they want to prevent it forbecoming a land of leisure for city dwellers. However in the absence of specifically protected areas guaranteeing environmental quality, one can only wonder about the chances that the « dual balancing improvement » (Bätzing, Rougier, 2006) will be maintained. Patterns of territorial coherence that have recently been developed aware of these stakes. That is why the analysis conducted throughout this study will pay particular attention to the evolution of spatial dynamics affecting the future of scenic beauty, which constitues the essential richness of these highlands. This matter should be valued notably by a scientific mediation not sporadic and fragmentary such as it is it at present, but conceived according to a coherence in link with the identity of the territory.

L'objectif général de cette thèse est axé sur l’amélioration de modèles agro-hydrologique spatialement distribués pour l’analyse d'agro-hydrosystèmes, sous contrainte de changements climatiques et anthropiques. Cette thèse est structurée autour de trois questions de recherche liées à : i) la représentation de la dynamique spatio-temporelle des systèmes de cultures pour leur utilisation en entrée de modèles agro-hydrologiques distribués ; ii) la représentation du niveau exploitation agricole et des décisions des agriculteurs dans les modèles agro-hydrologiques distribués ; iii) la capacité de ces modèles à simuler des changements climatiques et anthropiquesDes éléments de réponse à ces questions sont apportés par des approches de modélisation réalisées dans différents contextes et à différentes échelles d’espace et de temps. Ces différentes approches sont discutées en les comparant notamment avec d’autres travaux réalisés. Ces différentes études soulèvent la nécessité de développer des méthodologies permettant i) d’une part l’acquisition de données et leur intégration dans les modèles agro-hydrologiques distribués ii) et d’autre part l’amélioration de l’exploitation des simulations, notamment pour les transformer en informations pertinentes et accessibles pour les parties prenantes au niveau d’un territoire. Des perspectives, portant à la fois sur la prise en compte des incertitudes des simulations des modèles agro-hydrologiques et l’analyse de la robustesse de ces modèles, sont également considérées. / The general objective of this thesis is to improve spatially distributed agro-hydrological models for agro-hydrosystems analysis, under climatic and anthropogenic changes, in order to contribute to the identification of levers of action to mitigate effects of non-point source agricultural pollution. This thesis is structured around three research questions related to: i) the representation of spatio-temporal dynamics of cropping systems for their use as input in distributed agro-hydrological models; ii) the representation of farm level and decisions of farmers in distributed agro-hydrological models; and iii) the ability of these models to simulate climate and anthropogenic changes.Elements of response to these questions are provided by modeling approaches carried out in different contexts and at different scales of space and time. These approaches are discussed by comparing them with other works carried out. These different studies raise the need to develop methodologies allowing (i) the acquisition of data and their integration in distributed agro-hydrological models (ii) and, the improvement of the use of simulations results, in particular to transform them into relevant and accessible information for stakeholders at territorial level. Perspectives, covering both uncertainties of the simulations of the agro-hydrological models and the analysis of the robustness of these models, are also considered

Selon les nouvelles orientations agroécologiques qui s’imposent largement, il convient d’élaborer des systèmes d’élevage adaptés aux contraintes environnementales, efficients et pourvoyeurs de services écosystémiques bénéfiques pour l’environnement et la société. La question se pose singulièrement dans nos territoires antillais et ceci dans le cadre d’une demande pressante en produits carnés de qualité et à forte valeur patrimoniale comme l’est la viande caprine en Guadeloupe. Les petits ruminants, principalement élevés au pâturage, sont exposés aux infestations par les nématodes gastro-intestinaux (NGI) qui constituent une cause majeure de morbidité et de mortalité. Le déploiement de techniques adaptées et applicables sur le terrain s’avère nécessaire. Aussi des méthodes de gestion intégrée du parasitisme sont préconisées parmi lesquelles sont étudiées les stratégies d’alimentation des animaux. Il convient d’améliorer la capacité de l’animal hôte à tolérer les effets négatifs (résilience) ou à contrôler les infestations par les NGI (résistance) par la complémentation alimentaire. L’objectif de cette thèse était de définir des stratégies de complémentations des chevreaux en croissance, stade physiologique le plus touché par les NGI et dont les performances zootechniques conditionnent directement le revenu des producteurs (la production de viande).L’apport de la complémentation a été combinée à une série de recommandations de la gestion intégrée du parasitisme (voie génétique, méthode Famacha ®) et singulièrement à une stratégie de gestion du pâturage mixte avec des génisses. Ont été obtenus, un accroissement des résultats zootechniques (croissance et carcasse), de la note d’état corporel ainsi qu’une amélioration de la réponse physiologique (taux d’hématocrite). Une diminution du nombre de traitements anthelmintiques est observée aussi. Cet essai a abordé l’opérationnalité de la complémentation pour un éleveur. D’une façon générale, ce travail a ouvert aussi des questionnements scientifiques sur l’interaction nutrition*parasitisme avec un focus sur la nutrition azotée à déconnecter de l’alimentation énergétique. / New agroecological guidelines are needed around the world to develop livestock systems that are adapted to the environmental, efficient and environmentally and socially beneficial ecosystem services requirements. The question arises singularly in our Caribbean territories and this in the context of an urgent demand in meat products of quality and ofhigh patrimonial value as is the goat meat in Guadeloupe. Small ruminants, mainly grazed, are exposed to gastrointestinal nematode (NGI) infestations, which are a major cause of morbidity and mortality. The deployment of adapted and applicable techniques in the field is necessary. Therefore, methods of integrated management of parasitism are recommended among which are studied the strategies of feeding of the animals. The ability of the host animal to tolerate adverse effects (resilience) or to control infestations by NGI (resistance) should be enhanced by food supplementation. The objective of this thesis was to define supplementation strategies for growing kidneys, the physiological stage most affected by NGI and whose zootechnical performances directly affect the incarne of producers (meat production).Discussions focus on the development of targeted complementing strategies and attempt to answer questions: how to complement? (ln energy, nitrogen or both); When to complement? (Delay effects or effects during an established infestation). lt was also a question oftesting the life-size recommendations and on several variables (physio­pathological responses and zootechnical responses including carcass characteristics). In this sense this work has presented a certain originality. There was no statistically significant effect on carcass quality, however, in carcass­infected animals the carcasses were more degraded, especially with a low-protein diet. The complementation contribution was combined with a series of recommendations of integrated management of parasitism (genetic pathway, famacha method) and particularly a management strategy of mixed grazing with heifers. An increase in the zootechnical results (growth and carcass), body condition score and an improvement in physiological response, hematocrit) were obtained. A decrease in the number of anthelmintic treatments is also observed. This trial addressed the operationality of complementation for a breeder. In general, this work also opened up scientific questions about the interaction nutrition * parasitism with a focus on nitrogen nutrition to disconnect from the energy suooly