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Registros recuperados: 41
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A first step for modelling pollen dispersal at the landscape level: determining the shape of dispersal functions at long-distance. The case of oilseed rape Inra
Devaux, C.; Klein, E.K.; Lavigne, C..
Tipo: Conference Paper Palavras-chave: DISPERSION DU POLLEN; PLANTE OLEAGINEUSE; MODELISATION; DISSEMINATION; POLLUTION GENETIQUE POLLEN DISPERSAL; GENE FLOW; MODELLING; TRANSGEN POLLUTION.
Ano: 2003 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20076db224fc&uri=/notices/prodinra1/2007/06/
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A methodlogy for the evalution and improvement of a generic biophysical Soil-Plant-Atmosphere crop model based on "Mini-Aplication" Inra
Casellas, E.; Bergez, J.E.; Belhouchette, H.; Therond, O.; Adam, M.; Metay, A.; WERY, J..
Tipo: Conference Paper Palavras-chave:  CULTURE ARABLE  ARABLE CROPS; VINEYARDS; AGRO-FORESTRY; GRASSLAND; MODELLING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20114127cbe9&uri=/notices/prodinra1/2011/02/
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A three-dimensional numerical simulation of the osmotic dehydration of mango and effect of freezing on the mass transfer rates Inra
Floury, J.; Le Bail; Pham.
A mathematical model is developed for the mass and heat transfer during osmotic dehydration process of mango cubes. The model was implemented in COMSOL Multiphysics. Mass balance equations for the transport of water and sucrose were established separately for intracellular and extracellular volumes taking into account transfer across the cell membrane. The mass transfer resulted in change of intracellular and extracellular volumes as well as overall shrinkage. Measurements showed that freezing of the fruit significantly reduced cell diameter and tortuosity for extracellular mass transfer, and increased the rate of water loss but the relative effect on sugar gain was lower. Good quantitative agreement was achieved between the measured and predicted results...
Tipo: Journal Article Palavras-chave: OSMOTIC DEHYDRATION; MANGO FRUIT; MODELLING; FREEZING.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20086c17a39b&uri=/notices/prodinra1/2008/04/
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Accounting for atmospheric boundary layer variability on flux estimation from RS observations Inra
Timmermans, W.J.; Bertoldi, G.; Albertson, J.D.; Olioso, A.; Su, Z.; Gieske, A.S.M..
A Large Eddy Simulation (LES) model is coupled to a remote-sensing-basedSVAT that accounts for soil and vegetation in order to study the feedback effectsbetween surface state and spatial variability in fluxes, through the induction ofspatial variability in the lower atmosphere. As such, this study focuses on sensibleheat flux exchange. The simulations indicated that changes are introduced to theflux distributions mainly at higher surface temperatures. A scale-dependentmethod is presented to account for feedback effects. This showed the mostsignificant correlation between surface and air temperature at scales from 500 to1000m and modulated the spatial variance of sensible heat flux. This suggeststhat feedback effects act to limit the spatial variability in...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; MODELLING; LARGE EDDY SIMULATION; LES; SVAT; HEAT FLUX EXCHANGE.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200838de219f&uri=/notices/prodinra1/2008/09/
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Airflow and microclimate patterns in a one-hectare Canary type greenhouse: an experimental and CFD assisted study Inra
Majdoubi, H.; Boulard, T.; Fatnassi, H.; Bouirden, L..
This study presents an analysis of air circulation and microclimate distribution during daytime in a 1-hectare Canary type tomato greenhouse in the coastal area of southern Morocco. The investigation of the climate inside the greenhouse is based on a numerical simulation using a finite volumes method to solve the mass, momentum and energy conservation equations. The main novelty of this simulation lies in the realism of the 3D modelling of this very large agricultural structure with (i) a coupling of convective and radiative exchanges at the surface of the plastic roof cover, (ii) simulation of the dynamic influence of the insect screens and tomato crop on airflow movement, using the concept of porous medium, (iii) simulation, in each grid cell of the crop...
Tipo: Journal Article Palavras-chave: MODELE TRIDIMENSIONNEL; FILET ANTI-INSECTES GREENHOUSE; CFD; MODELLING; AIRFLOW; CLIMATE DISTRIBUTION; INSECT SCREENS.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010e4485b5e&uri=/notices/prodinra1/2010/03/
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An integrative modelling approach to simulate the agricultural sustem through a combination of a decisional, technical and biophisical sub-system. Inra
Merot, A.; Bergez, J.E.; Mailhol, J.C.; WERY, J..
Tipo: Conference Paper Palavras-chave:  GESTION DE L'EAU; LA CRAU  SUSTAINABLE DEVELOPMENT; PERENNIAL CROPS; WATER QUALITY; WATER MANAGEMENT; ENVIRONMENT; MODELLING; ENVIRONMENTAL POLICY.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011a5f05c1d&uri=/notices/prodinra1/2011/02/
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Analysis of the flowering time in apple and pear and bud break in nine, in relation to global warming in France Inra
Atauri, I.G.C.; Brisson, N.; Baculat, B.; Seguin, B.; Legave, J.M.; Calleja, M.; Farrera, I.; Guédon, Y..
A marked increase in air temperature has been observed in France since the end of the 1980s for fruit trees and vine regardless of cropping areas. As phenology is mainly influenced by temperature, changes in vegetative and flowering phenology timing will have agronomic consequences on these perennial productions. It is thus necessary to characterize the present and future trends of bud phenology in the context of global warming. Firstly, long-term series of phenological data extracted from a national data base devoted to fruit trees and vine (called PhénoClim®) have revealed changes in the time-course variations in flowering and vegetative phenology. Surprisingly, quite similar trends toward advances of flowering dates in various fruit trees and bud break...
Tipo: Conference Paper Palavras-chave: DEBOURREMENT; BESOINS EN FROID; BESOINS DE CHALEUR CHILLING REQUIREMENTS; DORMANCY; HEAT REQUIREMENTS; PHENOLOGY; MODELLING.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011988d60c6&uri=/notices/prodinra1/2011/02/
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Assessment of chilling requirements of apricot floral buds: comparison of three contrasting chilling models under mediterranean conditions Inra
Legave, J.M.; Baculat, B.; Brisson, N..
Different models to estimate the chilling requirements of floral buds in deciduous fruit trees are available, although they have rarely been compared one with the other. Moreover, the mathematical functions and associated parameters involved in chilling models are frequently chosen rather arbitrarily. This work therefore aimed to improve the choice of the chilling model by comparing in same conditions three contrasting models on the basis of biological measurements of completion of chilling requirements. The first one was the sum of hours when temperature is below or equal to the threshold of 7°C (binary model). The second one was the sum of Chill Units considering weighting effects of temperatures (comparable to a normal function). The third one was the...
Tipo: Conference Paper Palavras-chave: BESOINS EN FROID; RECHAUFFEMENT CLIMATIQUE; ADAPTATION VARIETALE; DIFFERENCIATION FLORALE FLORAL PRIMORDIA; DORMANCY; MODELLING; GLOBAL WARMING.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011bffd1db0&uri=/notices/prodinra1/2011/02/
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Building causal maps of livestock farming systems using a participatory method with dairy farmers Inra
Gouttenoire, L.; Cournut, S.; Ingrand, S..
To improve sustainability, farmers may want to redesign their livestock farming systems in depth, e.g. convert to organic farming. Assuming that modelling livestock farming systems can support such redesign processes, we devised and tested a modelling methodology in which farmers participated. Fifteen cattle dairy farmers converting or converted to organic farming took part in our programme. The programme first consisted in a series of meetings and surveys with both the local extensionists and the farmers. This first step made it possible to identify a list of relevant topics linked to the converting processes, and to make the farmers feel more engaged in the programme. The following step was made of participatory workshops during which farmers were...
Tipo: Conference Paper Palavras-chave: LIVESTOCK FARMING SYSTEMS; MODELLING; PARTICIPATION; REDESIGN; SUPPORT TOOLS; CAUSAL MAPPING.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20104356beb6&uri=/notices/prodinra1/2011/03/
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Categorising farming practices to design sustainable land-use management in mountain areas Inra
Girard-Fourty, N.; Duru, M.; Hazard, L.; Magda, D..
In European mountain areas, shrub encroachment resulting from farmland abandonment is most often managed by mechanical operations such as roller chopping or controlled burning, which have proved to be ineffective and unsustainable. Recent agroecological findings highlight the potential impact of grazing on long-term shrub dynamics. We thus explored the potential contribution of livestock farms to the management of shrub encroachment. We studied the diversity of livestock practices and strategies on the scale of a small mountain valley in France where a land-use management plan was initiated. We interviewed 33 livestock farmers with a comprehensive approach and analysed the data in partnership with local land-use managers. To categorise farming practices,...
Tipo: Journal Article Palavras-chave: AGROECOLOGIE ; DEVELOPPEMENT DURABLE; ORGANISATION SPATIALE; ZONE HERBEUSE; DEVELOPPEMENT TERRITORIAL; AGROSYSTEME CULTIVE; AGROSYSTEME HERBAGER LIVESTOCK FARMING PRACTICES; SUSTAINABLE DEVELOPMENT; LAND USE PRACTICE; LAND USE MANAGEMENT; LIVESTOCK MANAGEMENT; FEEDING SYSTEM; FARMLAND UTILISATION; SUSTAINABLE MANAGEMENT; MOUNTAIN AREA; AGRO-ECOSYSTEM MANAGEMENT; GRAZING; MODELLING; SHRUB ENCROACHMENT; TYPOLOGY.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008a0f68edf&uri=/notices/prodinra1/2010/05/
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Categorising farming practices to design sustainable land-use management in mountain areas Inra
Girard, N.; Duru, M.; Hazard, L.; Magda, D..
In European mountain areas, shrub encroachment resulting from farmland abandonment is most often managed by mechanical operations such as roller chopping or controlled burning, which have proved to be ineffective and unsustainable. Recent agroecological findings highlight the potential impact of grazing on long-term shrub dynamics. We thus explored the potential contribution of livestock farms to the management of shrub encroachment. We studied the diversity of livestock practices and strategies on the scale of a small mountain valley in France where a land-use management plan was initiated. We interviewed 33 livestock farmers with a comprehensive approach and analysed the data in partnership with local land-use managers. To categorise farming practices,...
Tipo: Journal Article Palavras-chave: AGRO-ECOSYSTEM MANAGEMENT; LIVESTOCK FARMING PRACTICES; GRAZING; MODELLING; SHRUB ENCROACHMENT; TYPOLOGY.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008a70dcac0&uri=/notices/prodinra1/2010/05/
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Comment faire face aux changements climatiques en arboriculture fruitière ? Inra
Legave, J.M..
Après avoir rappelé le contexte général des changements climatiques et précisé plus particulièrement les changements en matière de réchauffement, la relative vulnérabilité de l’arboriculture fruitière est soulignée sur la base de bon nombre de ses caractéristiques, tant biologiques qu’économiques. De façon inattendue, cette vulnérabilité s’est déjà exprimée au cours des années 2000 par des irrégularités de production pour certaines espèces dans les régions méridionales françaises. Un vrai défi semble donc s’annoncer qui doit conduire la communauté scientifique et professionnelle concernée à s’en emparer, même si de fortes incertitudes subsistent sur les prédictions climatiques. La caractérisation et l’analyse des enjeux (impacts et conséquences)...
Tipo: Journal Article Palavras-chave: RECHAUFFEMENT; MATURITE; INCERTITUDE; SCENARIOS CLIMATIQUES; RESSOURCES GENETIQUES WARMING; DROUGHT; PARASITISM; DORMANCY; PHENOLOGY; FLOWERING; MATURITY; UNCERTAINTY; ADAPTATION; MODELLING; CLIMATIC SCENARIOS; GERMPLASM.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010403a39c2&uri=/notices/prodinra1/2010/08/
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Decomposition of European beech (Fagus sylvatica) litter: Combining quality theory and 15N labelling experiments Inra
D'annunzio, R.; Zeller, B.; Nicolas, M.; Dhôte, J.F.; Saint-André, L..
A multi-site and multi-age set of in situ 15N-labelled litter decomposition experiments was carried out in various European beech forests. The sites presented contrasted situations of climate and humus type that were representative of northern Europe temperate forests. 15N-labelled leaf litter was produced by urea spraying in an experimental beech plot, and was used in litter decomposition experiments over a 3–6-year period, depending on the site. Schemes of decomposition covered a wide range of situations, some of them not expected, like high decay rate on Moder humus forms or slow decomposition on Mull humus form. The objectives of this study were to determine how nitrogen release and/or incorporation rates could characterize litter decomposition...
Tipo: Journal Article Palavras-chave: AZOTE 15; CYCLE AZOTE; LITIERE; DECOMPOSITION BIOGEOCHEMISTRY; LITTER; TEMPERATE FOREST; CARBON; NITROGEN; NORTHERN EUROPE TEMPERATE; SOIL ORGANIC MATTER; ECOSYSTEM; 15N LABELLING; NITROGEN CYCLE; MODELLING; QUALITY THEORY; LEAF DECOMPOSITION; HUMUS; BEECH.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010216634f6&uri=/notices/prodinra1/2010/10/
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Describing and locating cropping systems on a regional scale. A review Inra
Burger-Leenhardt, D.; Angevin, F.; Biarnes, A.; Colbach, N.; Mignolet, C..
At regional scale issues such as diffuse pollution, water scarcity and pollen transfer are closely related to the diversity and location of cropping systems because agriculture interacts with many other activities. Although sustainable land use solutions for territorial development and natural resource management are needed, very few agro-environmental studies account for both the coherence and the spatial variability of cropping systems. The originality of this article is to review methods that describe and locate cropping systems within large areas. We mainly based our analysis on four case studies using the concept of cropping systems on a regional scale, but differing in their objectives and extents. We found that describing and locating cropping...
Tipo: Journal Article Palavras-chave: AGRICULTURAL PRACTICES; SPATIAL DISTRIBUTION; MODELLING; CROPPING SYSTEM; SCALE CHANGE; ENVIRONMENTAL IMPACT.
Ano: 2010 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009c47af49c&uri=/notices/prodinra1/2010/06/
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Développement d’un indicateur d’exposition des eaux de surface aux pertes de pesticides à l’échelle du bassin versant Inra
Wohlfahrt, J..
France où la production d’eau potable est dépendante à 38 % de cette ressource. Cette pollution étant en grande partie liée à l’activité agricole, la mise en place de pratiques permettant de limiter les transferts de pesticides vers les eaux de surface représente une solution intéressante. Afin de connaître les processus en jeu et d’apprécier l’efficacité de tels projets, il est important de développer des méthodes spécifiques d’évaluation agri-environnementale. Si les méthodes d’évaluation parcellaires sont opérationnelles, celles à l’échelle du bassin versant ne sont pas encore bien adaptées aux besoins des acteurs de terrain. Ce travail a pour objectif de développer un indicateur de risque d’exposition des eaux de surface aux pertes de pesticides par...
Tipo: Thesis Palavras-chave: EVALUATION AGRI-ENVIRONNEMENTALE; INDICATEUR PARCELLAIRE; INDICATEUR DE CONNECTIVITE INDICATOR; MODELLING; CATCHMENT; AGRO-ENVIRONMENTAL ASSESSMENT; SURFACE WATER.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20098c70cf3e&uri=/notices/prodinra1/2009/01/
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Évaluation ex ante des systèmes de culture innovants par modélisation agronomique et économique : de la conception à l'adoption ; cas des systèmes de culture bananiers de Guadeloupe Inra
Blazy, J.M..
Face à la multiplication et la complexité croissante des objectifs assignés à l’agriculture, les méthodologies de conception et d’évaluation ex ante de systèmes de culture innovants font l’objet d’un effort de recherche très soutenu. Cependant malgré le foisonnement de recherches et de productions d’outils disciplinaires, peu de recherches d’interface ont été entreprises, ce qui limite les possibilités d’évaluations ex ante globales des systèmes innovants, de la conception à l’adoption par les agriculteurs. L’objectif de cette thèse est de contribuer à l’avancée de ces travaux, en proposant une méthode transdisciplinaire d’évaluation ex ante de systèmes de culture innovants basée sur la combinaison d’outils de modélisation issus de l’agronomie et de...
Tipo: Thesis Palavras-chave: ÉVALUATION EX ANTE; APPROCHE TRANSDISCIPLINAIRE ADOPTION; EX ANTE ASSESSMENT; MODELLING; TRANSDISCIPLINARY APPROACH.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2009224822ee&uri=/notices/prodinra1/2009/12/
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Evaluation of greenhouse gas emissions and design of mitigation options: a whole farm approach based on farm management data and mechanistic models Inra
Fiorelli, J.L.; Drouet, J.L.; Duretz, S.; Gabrielle, B.; Graux, A.I.; Blanfort, V.; Capitaine, M.; Cellier, P.; Soussana, J.F..
Agricultural activities are important sources of atmospheric nitrous oxide (N2O), methane (CH4), and carbon dioxide (CO2). In the European Union, the agricultural sector contributes approximately 10% of the total emitted greenhouse gases (GhG). We search for evaluating GhG emissions at the farm level and designing mitigation options from a biotechnical point of view. As GhG emissions occur at several stages within the farm operation, it is essential to combine nutrient cycling and farm working through an integrated farm approach to reach a full accounting of processes. Our proposal comprises the following characteristics:- Our whole farm approach (FarmSim) combines empirical and mechanistic modelling through describing of above and below ground C and N...
Tipo: Conference Paper Palavras-chave: GAZ A EFFET DE SERRE; GESTION DE L'EXPLOITATION AGRICOLE; PRATIQUE AGRICOLE; MODELE MECANISTE GREENHOUSE GAS EMISSION; FARM MANAGEMENT PRACTICE; MIXED CROP LIVESTOCK SYSTEM; MODELLING; WHOLE FARM APPROACH.
Ano: 2008 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008d14c3040&uri=/notices/prodinra1/2011/01/
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Evaluation of the surface energy balance system (SEBS) applied to ASTER imagery with flux-measurements at the SPARC 2004 site (Barrax, Spain) Inra
van der Kwast, J.; TIMMERMANS, A.; Gieske, A.; SU, Z.; Olioso, A.; Jia, L.; Elbers, J.; Karssenberg, D.; de Jong, S..
Accurate quantification of the amount and spatial variation of evapotranspiration is important in a wide range of disciplines. Remote sensing based surface energy balance models have been developed to estimate turbulent surface energy fluxes at different scales. The objective of this study is to evaluate the Surface Energy Balance System (SEBS) model on a landscape scale, using tower-based flux measurements at different land cover units during an overpass of the ASTER sensor over the SPARC 2004 experimental site in Barrax (Spain). Additionally, the effect of replacement of empirical roughness functions in the model by field estimates or literature values is investigated. Modelled fluxes correspond better with flux measurements over uniform land cover...
Tipo: Journal Article Palavras-chave: REMOTE SENSING; ENERGY BALANCE; MODELLING.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200914bcdc5e&uri=/notices/prodinra1/2011/02/
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Global warming in Europe and its impacts on floral bud phenology in fruit species Inra
Legave, J.M.; Giovannini, D.; Christen, D.; Oger, R..
In the context of climate change, the fruit tree sector has specific vulnerabilities, such as perennial plantations and a complex flowering process to achieve fruit production. More particularly, warming impacts on floral bud phenology and their subjacent effects have been investigated for fruit tree species in different European regions. Numerous flowering data collected in contrasting temperature conditions (location, period) highlighted similar and significant advances in dates of different phenological stages for all the locations and fruit species. That means strong impacts of temperature changes in Europe (low interactions cultivar x temperature). The statistical analysis supports a general coincidence at the end of the 1980s between abrupt...
Tipo: Conference Paper Palavras-chave: BESOINS EN FROID; BESOINS EN CHALEUR DATABASE; DORMANCY; MODELLING; CHILLING REQUIREMENT; HEAT REQUIREMENT.
Ano: 2009 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010bd27a3cc&uri=/notices/prodinra1/2010/12/
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How the EU single farm payment should be modelled: lump-sum transfers, area payments or… something else? Inra
Courleux, F.; Guyomard, H.; Levert, F.; Piet, L..
Le découplage des paiements directs adopté lors de la réforme de la Politique Agricole Commune (PAC) de 2003 modifie radicalement la façon dont l’Union Européenne (UE) soutient son secteur agricole. Il n’y a plus d’obligation de production pour pouvoir prétendre au bénéfice de l’aide attachée aux Droits au Paiement Unique (DPU). Malgré cela, le nouveau dispositif maintient un lien spécifique entre les paiements et la terre ; de plus, les DPU peuvent être échangés entre agriculteurs. Etant donné ces caractéristiques, la question de la modélisation des DPU se pose : sont-ils des transferts forfaitaires, des aides à la surface ou… autre chose ? Le cadre analytique microéconomique proposé ici montre que la réponse dépend fondamentalement du rapport entre le...
Tipo: Conference Paper Palavras-chave: UNION EUROPEENNE; DROIT AU PAIEMENT UNIQUE; MODELISATION; AIDES A LA SURFACE; TRANSFERT FORFAITAIRES EUROPEAN UNION; COMMON AGRICULTURAL POLICY; SINGLE FARM PAYMENT; MODELLING; AREA PAYMENT; LUMP-SUM TRANSFER.
Ano: 2007 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2010c5cd2ab2&uri=/notices/prodinra1/2010/06/
Registros recuperados: 41
Primeira ... 123 ... Última
 

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