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Papers by Meynard Jean-marc

Research paper thumbnail of Alimentation animale et organisation des filières : une comparaison pois protéagineux-lin oléagineux pour comprendre les facteurs freinant ou favorisant les cultures de diversification

Research paper thumbnail of Concevoir des systèmes de production agroécologiques dans les stations expérimentales de l'INRA: changements de référentiel professionnel pour les agents et les collectifs de recherche

Alors que l’'INRA affiche comme une priorite, dans son document d’'orientation 2010-2020,... more Alors que l’'INRA affiche comme une priorite, dans son document d’'orientation 2010-2020, la « conception, l’'experimentation et l’'evaluation de nouveaux systemes agricoles s’'inscrivant dans le cadre exigeant du developpement durable », le dispositif experimental de l''Institut est appele a renouveler ses thematiques et son mode de fonctionnement : investissement sur des pratiques inspirees de l'agroecologie (une trentaine de sites concernes, d’'apres le rapport Soussana, 2012), ouverture a un partenariat scientifique et socio-economique elargi, contribution accrue a la mise au point et a la demonstration de prototypes de systemes de production innovants… Cette evolution du dispositif impose des changements profonds dans les pratiques, les competences et l’'organisation des equipes d'’experimentateurs. C’est a ces changements que l'’on s’interesse dans cet article.

Research paper thumbnail of Sources of online U.S. legislative and

Journal of Government Information, 1997

Research paper thumbnail of Methodological Progress in On-Farm Regional Agronomic Diagnosis: A Review

Sustainable Agriculture, 2009

Research paper thumbnail of Non-uniformity of environmental conditions in greenhouse lettuce production increases the risk of N pollution and lower product quality

Research paper thumbnail of Evaluation of environmentally-friendly crop management systems based on very early sowing dates for winter oilseed rape in France

Research paper thumbnail of GeneSys: a model of the influence of cropping system on gene escape from herbicide tolerant rapeseed crops to rape volunteers

Agriculture, Ecosystems & Environment, 2001

Research paper thumbnail of A diagnostic method for assessing regional variations in crop yield

Agricultural Systems, 1997

Research paper thumbnail of Devising fertiliser recommendations for diverse cropping systems in a region: the case of low-input bean/maize intercropping in a tropical highland of Haïti

Research paper thumbnail of A Conceptual Model to Design Prototypes of Crop Management: A Way to Improve Organic Winter Oilseed Rape Performance in Farmers' Fields

Research paper thumbnail of Characterization of multiple disease systems and cultivar susceptibilities for the analysis of yield losses in winter wheat

ABSTRACT The relationship between winter wheat (Triticum aestivum L.) cultivar susceptibility to ... more ABSTRACT The relationship between winter wheat (Triticum aestivum L.) cultivar susceptibility to four main fungal diseases, multiple disease systems, and yield loss (YL) levels was studied. Data from 276 wheat cultivar trials carried out in major wheat-growing areas in France over 12 years (1991–2002) were analyzed. Two variables were defined for each disease: actual disease intensity, referring to individual cultivar and potential disease intensity for each trial, calculated from the disease intensities measured on susceptible cultivars. Cultivar was represented by its level of susceptibility to each disease, previously given by GEVES and based on a semi-quantitative scale. YL was estimated for a given cultivar as the difference between the mean yield of fungicide-protected and of untreated plots. Nonparametric multivariate analysis provided a characterization of relationships among variables. Eight cultivar susceptibility profiles (CP), five potential disease profiles (PDP), and six actual disease profiles (ADP) were determined by cluster analysis. Correspondence analyses led to a good description of variation in YL when potential or ADP were considered. General linear models were developed for each of the five PDP, which involved a significant interaction between CP and PDP on YL. These empirical models provided a means of quantifying the effects of CP on YL. These models represent a practical tool to support choices for multiple-disease resistances in a given area, depending on the prevailing disease profile. Results from this study can also be used to improve the disease module of an agronomic model for wheat aimed at designing “cultivar×crop management” combinations for a given environment and cost/price ratio.

Research paper thumbnail of Diagnosis on the sustainability of an upland cropping system of southern Haiti

Agriculture, Ecosystems & Environment, 2005

Research paper thumbnail of Spatialisation de scénarios d'évolution du ruissellement érosif et implications pour les politiques publiques locales

Espace géographique

ABSTRACT

Research paper thumbnail of Designing a tool to analyse the performance of biological systems

Research paper thumbnail of Methodology for designing sustainable farming systems: prototyping and model-based explorations in a participatory research setting

Research paper thumbnail of Yield variation of organic winter wheat; a crop diagnosis on a field network in South-East of France

Agronomy for Sustainable Development

Research paper thumbnail of The assessment of a decision making tool for managing the nitrogen fertilization of organic winter wheat

European Journal of Agronomy

Research paper thumbnail of La désintensification: point de vue d'un agronome

Research paper thumbnail of Les enjeux de la production de blé tendre en agriculture biologique

Research paper thumbnail of Analysis of necessary adjustements of farming practices

Research paper thumbnail of Alimentation animale et organisation des filières : une comparaison pois protéagineux-lin oléagineux pour comprendre les facteurs freinant ou favorisant les cultures de diversification

Research paper thumbnail of Concevoir des systèmes de production agroécologiques dans les stations expérimentales de l'INRA: changements de référentiel professionnel pour les agents et les collectifs de recherche

Alors que l’'INRA affiche comme une priorite, dans son document d’'orientation 2010-2020,... more Alors que l’'INRA affiche comme une priorite, dans son document d’'orientation 2010-2020, la « conception, l’'experimentation et l’'evaluation de nouveaux systemes agricoles s’'inscrivant dans le cadre exigeant du developpement durable », le dispositif experimental de l''Institut est appele a renouveler ses thematiques et son mode de fonctionnement : investissement sur des pratiques inspirees de l'agroecologie (une trentaine de sites concernes, d’'apres le rapport Soussana, 2012), ouverture a un partenariat scientifique et socio-economique elargi, contribution accrue a la mise au point et a la demonstration de prototypes de systemes de production innovants… Cette evolution du dispositif impose des changements profonds dans les pratiques, les competences et l’'organisation des equipes d'’experimentateurs. C’est a ces changements que l'’on s’interesse dans cet article.

Research paper thumbnail of Sources of online U.S. legislative and

Journal of Government Information, 1997

Research paper thumbnail of Methodological Progress in On-Farm Regional Agronomic Diagnosis: A Review

Sustainable Agriculture, 2009

Research paper thumbnail of Non-uniformity of environmental conditions in greenhouse lettuce production increases the risk of N pollution and lower product quality

Research paper thumbnail of Evaluation of environmentally-friendly crop management systems based on very early sowing dates for winter oilseed rape in France

Research paper thumbnail of GeneSys: a model of the influence of cropping system on gene escape from herbicide tolerant rapeseed crops to rape volunteers

Agriculture, Ecosystems & Environment, 2001

Research paper thumbnail of A diagnostic method for assessing regional variations in crop yield

Agricultural Systems, 1997

Research paper thumbnail of Devising fertiliser recommendations for diverse cropping systems in a region: the case of low-input bean/maize intercropping in a tropical highland of Haïti

Research paper thumbnail of A Conceptual Model to Design Prototypes of Crop Management: A Way to Improve Organic Winter Oilseed Rape Performance in Farmers' Fields

Research paper thumbnail of Characterization of multiple disease systems and cultivar susceptibilities for the analysis of yield losses in winter wheat

ABSTRACT The relationship between winter wheat (Triticum aestivum L.) cultivar susceptibility to ... more ABSTRACT The relationship between winter wheat (Triticum aestivum L.) cultivar susceptibility to four main fungal diseases, multiple disease systems, and yield loss (YL) levels was studied. Data from 276 wheat cultivar trials carried out in major wheat-growing areas in France over 12 years (1991–2002) were analyzed. Two variables were defined for each disease: actual disease intensity, referring to individual cultivar and potential disease intensity for each trial, calculated from the disease intensities measured on susceptible cultivars. Cultivar was represented by its level of susceptibility to each disease, previously given by GEVES and based on a semi-quantitative scale. YL was estimated for a given cultivar as the difference between the mean yield of fungicide-protected and of untreated plots. Nonparametric multivariate analysis provided a characterization of relationships among variables. Eight cultivar susceptibility profiles (CP), five potential disease profiles (PDP), and six actual disease profiles (ADP) were determined by cluster analysis. Correspondence analyses led to a good description of variation in YL when potential or ADP were considered. General linear models were developed for each of the five PDP, which involved a significant interaction between CP and PDP on YL. These empirical models provided a means of quantifying the effects of CP on YL. These models represent a practical tool to support choices for multiple-disease resistances in a given area, depending on the prevailing disease profile. Results from this study can also be used to improve the disease module of an agronomic model for wheat aimed at designing “cultivar×crop management” combinations for a given environment and cost/price ratio.

Research paper thumbnail of Diagnosis on the sustainability of an upland cropping system of southern Haiti

Agriculture, Ecosystems & Environment, 2005

Research paper thumbnail of Spatialisation de scénarios d'évolution du ruissellement érosif et implications pour les politiques publiques locales

Espace géographique

ABSTRACT

Research paper thumbnail of Designing a tool to analyse the performance of biological systems

Research paper thumbnail of Methodology for designing sustainable farming systems: prototyping and model-based explorations in a participatory research setting

Research paper thumbnail of Yield variation of organic winter wheat; a crop diagnosis on a field network in South-East of France

Agronomy for Sustainable Development

Research paper thumbnail of The assessment of a decision making tool for managing the nitrogen fertilization of organic winter wheat

European Journal of Agronomy

Research paper thumbnail of La désintensification: point de vue d'un agronome

Research paper thumbnail of Les enjeux de la production de blé tendre en agriculture biologique

Research paper thumbnail of Analysis of necessary adjustements of farming practices

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