Animation scientifique Agroécologie Intensification écologique des systèmes de culture



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A monthly rendez‐vous

«Scientific animation on Agroecology ‐
Ecological intensification of cropping systems»


Several joint agricultural research units in Montpellier from CIRAD, INRA, IRD and Montpellier SupAgro have initiated a monthly cycle of seminars and debates, in partnership with Agropolis International, around ecological intensification of cropping systems.

Next seminars in 2012 (in French):

Past conferences

See the videos :




May 3rd, 2012: Agronomy and the challenges of food production / John Porter (Professor of Agricultural Systems Ecology, University of Copenhagen Denmark, Associate Editor-in-Chief EJA and Coordinating Lead Author for IPCC) invited by the research unit System and Agropolis International.
John Porter will present his ideas on agronomy as the ecological science of food production. Agronomy needs to be be reinvented to play its crucial role in solving inter-linked problems that include food production and demand and emissions of GHG. He will present some new ideas and concepts with examples to show how agronomy can help in the challenge of the ecological intensification of food production.

April 3rd, 2012: Comparaison de l’ACV et de la certification HVE comme outils d’affichage environnemental: évaluation des impacts ou évaluation des pratiques / Vincent Colomb (IRD - research unit Eco&Sols) and Cécile Bessou (CIRAD - research unit Annual Cropping systems)

March 6, 2012: "Modélisation "ad hoc" en agronomie: qu'avons nous appris depuis 15 ans sur la construction d'un modèle de simulation en fonction de la question à traiter ?" / François Affholder (research team Annual Cropping Systems - CIRAD)

February 7, 2012: "P for two – Sharing a scarce resource: soil P in intercropping systems" / Ph Hinsinger (research unit Eco&Sols - INRA)
The exhaustion of rock phosphate resources is a major issue for agriculture in the 21st century. One promising option for increasing soil P acquisition efficiency in agro-ecosystems is to make better use of plant diversity, and especially of the positive belowground-interactions occurring between two intercropped species. Niche complementarity occurs when two species explore distinct soil volumes or access different pools of soil resources, e.g. inorganic and organic P. Facilitation occurs when roots of one species, or their rhizosphere microbial community, release P-solubilising compounds such as protons/hydroxyls, carboxylates or phosphatases, thereby resulting in an increased availability of soil P, which ultimately benefits the intercropped species. These facilitative interactions will thus be promoted when the roots of the two intercropped species are closely intermingled. The need for close proximity between roots may however be offset by mycorrhizal symbiosis, which might confer access to soil P resources at longer distances from roots. Better understanding these intimate rhizosphere processes shall help designing more P-efficient intercropping systems for the future.January 10 janvier (10-12h): "Un modèle conceptuel de fonctionnement du système sol/eau/plantes/microorganismes piloté par le pH et le potentiel redox" / O. Husson (research unit Conservation Agriculture and Systems Engineering CIRAD)

December 6, 2011: "Introduction of functional biodiversity in agroecosystems, case of banana cropping systems" / Philippe Tixier (research unit Banana, Plantain and Pineapple Cropping Systems - CIRAD)
The relation between biodiversity and ecosystem functions has received particular attention from ecologists. Ecological intensification, which lies on ecological processes to enhance ecosystem functions, depends on this relation. We present, with the example of banana cropping systems, a concrete case where plant diversity is reintroduced to improve weed and pest control, while maintaining agronomic, economic and environmental performances. We present on which criteria and with which methodology cover crops selection could be done. Our studies also aim to disentangle the effect of added biodiversity on mechanisms of pest regulation (plant parasitic nematodes and banana weevils). Finally, we present a conceptual framework, based on soil, plants, and food webs functioning, allowing a global management of agroecosystems in condition of ecological intensification.

November 8, 2011: «Agroforesterie tempérée : une intensification écologique exceptionnelle décortiquée à l’aide d’outils de simulation innovants» / Christian Dupraz, research unit System

October 4, 2011: "Intensification of soil ecological processes in agriculture" / Eric Blanchart, research unit Eco&Sols
Soils play a central role in ecosystem and agrosystem functioning. New paradigms in agriculture give a major importance to natural processes, especially the ones linked to soil biota. Diversity and functions realized by soil organisms, and ways to enhance ecological processes will be developed in this talk.

September 8, 2011: "Compromis entre production et biodiversité arborée dans les agroforêts à café" / N. Lamanda

June 16, 2011: «Effets de la diversification végétale sur la régulation des populations et des dégâts de bioagresseurs dans les agroécosystèmes» / Alain Ratnadass (research unit HortSys).



Update 06.06.12

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