Prévu par le plan biodiversité, l’Observatoire national de l’artificialisation des sols (ONAS) a été lancé le 9 juillet. Il sera notamment alimenté par les données satellitaires analysées par l’Institut national de recherche en sciences et technologies pour l’environnement et l’agriculture (Irstea) grâce à des algorithmes informatiques.
Lire l’article payant sur :
http://www.journaldelenvironnement.net/article/l-ia-turbine-pour-observer-l-artificialisation-des-sols,98644
Spécialiste des questions environnementales, le député appelle le gouvernement à élargir sa politique en matière de transition écologique, alors que les experts de l’ONU doivent publier un rapport sur la pollution des terres.
Lire l’article sur :
https://www.europe1.fr/societe/environnement-un-quart-des-sols-de-la-planete-aujourdhui-sont-degrades-deplore-matthieu-orphelin-3912727
L’extraordinaire abondance des nématodes a été chiffrée pour la première fois: ils sont 440 milliards de milliards! Ils pourraient jouer un rôle non négligeable dans le cycle du carbone.
Lire l’article sur :
http://www.lefigaro.fr/sciences/les-nematodes-de-minuscules-geants-des-sols-20190802
Du 20 novembre 2019 au 21 novembre 2019 à Dijon (21) – France
Evénement biennal, la 14è édition de RENCONTRES Comifer-Gemas
accueillera les 20 et 21 novembre à Dijon, tous les acteurs de la
fertilisation raisonnée : enseignants-chercheurs, prescripteurs,
fabricants, distributeurs et négociants, prestataires de services.
2 jours pour actualiser ses connaissances sur l’évolution des
raisonnements et des techniques de mesure de la fertilité des sols,
découvrir des solutions techniques, scientifiques, innovantes.
– 22 présentations orales organisées en 7 sessions aborderont des sujets
d’actualité tels que l’économie circulaire, la gestion de la matière
organique, les indicateurs biologiques, les voies de progrès dans la
gestion de l’azote etc.
– Une cinquantaine de posters
– Une zone d’exposition
Voir l’appel à communication sur :
comifer.asso.fr/images/rencontres/14emes_rencontres2019/COMIFER_GEMAS_AppelAcommunication_2019.pdf
Cette journée sera l’occasion de nous retrouver dans un cadre convivial pour des échanges scientifiques et techniques autour de ces thématiques majeures. Elle nous permettra de dresser un bilan de la plus-value apportée par les travaux du RMT Fertilisation & Environnement depuis 12 ans, d’échanger autour des nouveaux enjeux de l’économie circulaire à différentes échelles spatiales, et de présenter le programme du RMT BOUCLAGE, candidat à la succession du RMT F&E.
Le colloque se tiendra le 19 septembre 2019 dans l’auditorium de l’APCA à Paris 8.
Le programme prévisionnel du colloque est désormais disponible en ligne et ci-joint.
L’inscription est gratuite (dans la limite des places disponibles) mais obligatoire : INSCRIVEZ-VOUS dès aujourd’hui et au plus tard le 10 septembre.
La prise en compte de la qualité des sols en planification et aménagement urbains
Problématique multi-acteurs : quelles clés pour des collaborations réussies ?
Le 14 novembre 2019 à Nantes
Le lien vers l’appel à projet (ouverture au 28 juin 2019) est : https://www.soilver.eu/
La thématique générale est : ‘Recognizing and caring for soil and land as assets’
Deux sous-thématiques sont priorisées :
Les projets attendus sont :
Le calendrier est :
Sur
grainesdemane.fr/alain-canet-cessons-dopposer-la-protection-des-sols-et-la-production/,
un article qui pose la question de l’obligation de résultats/obligation
de moyens dans les cahiers des charges agroenvironnementaux, en
particulier pour les sols.
La carte de la France métropolitaine (hors Corse) des stocks de carbone dans les sols préparée par l’INRA dans le cadre d’un exercice mondial piloté par le Partenariat Mondial sur les Sols hébergé par la FAO vient d’être publiée sur le site du Gis Sol. La carte ainsi produite a été intégrée à la carte mondiale des stocks de carbone publiée récemment.
Pour plus d’information : http://www.gissol.fr/donnees/cartes/la-carte-nationale-des-stocks-de-carbone-des-sols-integree-dans-la-carte-mondiale-de-la-fao-4335
Le 8 Août 2019 un nouveau rapport spécial du GIEC sortira. Il traitera des « liens entre le changement climatique, la désertification, la dégradation des terres, la gestion durable des terres, la sécurité alimentaire, et les flux de gaz à effet de serre dans les écosystèmes terrestres »
Deux demi-journées de présentation de ce rapport auront lieu
le 12 Septembre 2019, 16 rue Claude Bernard (Paris 5ème) à AgroParisTech
La matinée sera dédiée à un large public, et présentera les principales conclusions du rapport. L’après-midi sera dédiée à la Recherche et à l’Enseignement Supérieur et traitera des nouvelles attentes que soulève ce rapport.
Biodiversité | 27 juin 2019 | Laurent Radisson
Le projet de loi sur l’Office français de la biodiversité (OFB), qui a fait l’objet d’un accord en commission mixte paritaire le 25 juin, contient une disposition qui devrait permettre de rétablir une certaine protection des zones humides.
Les sénateurs ont en effet adopté début avril un amendement du sénateur Jérôme Bignon qui modifie la définition des zones humides contenue à l’article L. 211-1 du code de l’environnement. Cette définition rétablit les critères alternatifs permettant de définir ces zones : présence d’eau ou de plantes hygrophiles. Avec cette modification, la définition va désormais être la suivante : « On entend par zone humide les terrains, exploités ou non, habituellement inondés ou gorgés d’eau douce, salée ou saumâtre de façon permanente ou temporaire, ou dont la végétation, quand elle existe, y est dominée par des plantes hygrophiles pendant au moins une partie de l’année« .
La définition des zones humides issue de la loi sur l’eau de 1992 avait été interprétée par le Conseil d’Etat dans un sens défavorable à leur protection à travers une décision du 22 février 2017. La juridiction administrative avait considéré que les deux critères devaient être réunis pour définir réglementairement une zone humide. Plusieurs associations avaient dénoncé le risque de déclassement de nombreuses zones humides et, de ce fait, de destruction.
Dans leur rapport remis le 29 janvier 2019 au ministre de la Transition écologique, Jérôme Bignon et la députée Frédérique Tuffnel pointaient une dégradation continue des zones humides. Une évaluation réalisée en 2012 sur les plus importantes zones humides françaises a montré que la moitié des prairies avaient subi une dégradation de leur état au cours de la décennie 2000. Le nombre de cas de dégradations s’accentuait même par rapport à la décennie précédente.
Dans le cadre de l’assemblée générale de l’Afes, une journée thématique sur les sols urbain se déroulera au centre IRD de Bondy le 6 juillet prochain.
En présence de Georges De Noni Directeur de l’IRD (sous réserve de disponibilité)
Présentation des bilans de l’Association (bilan moral, bilan financier et bilan d’activité) et débat sur les orientations à prendre pour la période à venir.
Présentation de salles de laboratoire exclusives à l’iEES Paris (ajouter détails).
Échanges conviviaux autour d’un repas partagé. N’hésitez pas à apporter vos spécialités !
Cette demi-journée de conférences a pour but de présenter les avancés des différentes branches des sciences du sol sur le thème des sols urbains. Elle a aussi pour vocation à être un lieu de rencontre entre spécialistes, ou non, provenant d’organismes de recherche, d’entreprises ou de collectivité…
· Potentiel des services écosystémique des sols construis (Technosols), Maha Deeb, Post-doctorante (Urban Soil Institut of New York)
· Elaboration du référentiel de fond pédo-géochimique du bassin parisien : quelles perspectives pour une gestion circulaire des sols urbains excavés ? – projet GeoBaPa, Coline Eychène, Cheffe de projet (SolTracing)
· Contamination des sols urbains cultivés – Risques En Fermes Urbaines : Gestion et Évaluation (REFUGE), Anne Barbillon, Chargée de mission (EXP’AU – AgroParisTech) / Coordinatrice du programme REFUGE
· Une nécessaire prise en compte de la qualité physico-chimique des sols des jardins collectifs urbains, Philippe Branchu, Ingénieur de recherche (Cerema) et Elisabeth Rémy, Ingénieure de recherche – HDR (INRA-AgroParisTech).
· Bond’innov, Pauline Sy, Chargée de projets (Campus de l’innovation)
· Table ronde avec l’ensemble des intervenants et échanges avec la salle
L’objectif des différents essais est de tester :
Une émission de France Culture qui faisait la part belle aux sols.
Now, the International Union of Soil Sciences has an Official Twitter Account. We invite you to follow us at the address @IUSS_ORG, to promote all our official activities and remain in touch with the Soil Science Scientists community worldwide.
Twitter messages have included news about the 95th anniversary of the foundation of IUSS; the first Massive Open Online Course on Tropical Soil Science which went online on the prestigious EdX online learning platform on May 13, 2019; an announcement of the “Soilutions” poster contest to address soil problems, and the IUSS book Global Soil Proverbs – Cultural Language of the soil.
Georges Pédro died on January 31st 2019. He was born on June 26th 1929. He had just published his last scientific study Surface Cover of the Earth’s Continental Areas (ed. AFES, 2018).
Georges Pédro is internationally renowned for his work on clay minerology and geochemical weathering processes. He was a Research Director at the INRA (France’s national institute for agronomic research) and played a vital role in France in the field of Pedology. Amongst others, he was president of the Orstom-IRD’s “Commission scientifique d’Hydrologie et Pédologie” (1984) (Scientific Commission for Hydrology and Pedology) and supervised and co-supervised numerous Orstom PhDs. It was his own exceptional thesis on experimental pedology that made him famous throughout the world: he experimentally modelled the principal global processes of soil weathering in the laboratory.
He was a remarkable teacher (1965-1995) and numerous soil scientists attended his DEA lessons in Pedology and continued on to PhD with him. Georges Pédro was a member of both the Academy of Science and the Academy of Agriculture. He received the CNRS (France’s National Research Centre) silver medal in 1980 and was Officer of the French Legion of Honour. He was not only an exceptional scientist but also a great humanist, historian and a highly cultured and sensitive man. He took time for people. Many of us, his colleagues, feel that we have lost a great friend.
[By Christian Feller and Michel Brossard, past president and current president AFES]
The Food and Agriculture Organization of the United Nations (FAO), the Global Soil Partnership (GSP), the Intergovernmental Technical Panel on Soils (ITPS), the Convention on Biological Diversity (CBD), the Global Soil Biodiversity Initiative and the European Commission are pleased to launch a call for experts for the establishment of a Working Group to develop a global and regional assessment of the state of knowledge on soil biodiversity.
The assessment will cover the current status of soil biodiversity, as well as opportunities and challenges to support the implementation of the 2030 Agenda for Sustainable Development and the Sustainable Development Goals. The call for expert is addressed to technical experts from governments, scientists and researchers, NGOs, policy makers at all levels, members of existing initiatives, and any other relevant stakeholder.
If you are interested in joining this working group, please send an email to Ms. Monica Kobayashi, copying the Global Soil Partnership Secretariat by the 28 June 2019.
Read more: http://www.fao.org/global-soil-partnership/resources/highlights/detail/en/c/1196842/
Invisible but pervasive, microplastics are washed into oceans and blown through the air. Now, scientists have uncovered that microplastics change agricultural crop growth. Agricultural soils could actually hold more microplastic than ocean basins. A new study explores the impact of microplastics on terrestrial systems, specifically agriculture. The researchers were interested in changes in the soil, microbes and plants exposed to microplastics. Pervasive microplastic contamination in soil may have consequences for plant performance, and thus for agroecosystems and terrestrial biodiversity.
[From: ASA–CSSA–SSSA Science Policy Report, 29 May 2019]
Studies indicate that solute sorption properties are less important when preferential flow is the dominating transport pathway. There is evidence that pesticides leach through partially frozen soil during winter and early spring and that preferential flow through macropores may be the cause of this. The effect of freezing on the transport of pesticides with different sorption properties has not been investigated before. In the current issue of the Vadose Zone Journal, researchers report on a study where the effect of freezing on the transport of pesticides with a range of soil sorption coefficients was investigated.
Read more: https://dl.sciencesocieties.org/publications/csa/articles/64/7/12a
[From: ASA–CSSA–SSSA Science Policy Report, 29 May 2019]
The world’s food production is in jeopardy because the fertile layer of soil that people depend on to plant crops is being eroded by human activities, scientists said recently. Climate change is likely to make it worse even as demand from a grown population is soaring, they said. Soil erosion happens naturally, but intensive agriculture, deforestation, mining and urban sprawl accelerate it and can reduce crop yields by up to 50%, according to the United Nations’ Food and Agriculture Organization (FAO).
[From: ASA–CSSA–SSSA Science Policy Report, 29 May 2019]
Soil erosion poses a major threat to global food security and to the achievement of the Sustainable Development Goals (SDGs). Find out more about the effects of soil erosion and the ways we can prevent it.
On the spot interviews to participants of the Global Symposium on Soil Erosion (GSER 19), 5 May 2019, FAO headquarters, Rome, Italy
The warming Arctic permafrost may be releasing more nitrous oxide, a potent greenhouse gas, than previously thought
Raza worked with scientists, including soil expert Alex McBratney from University of Sydney, to “find a way to use the compounds from society and industrial activity, and recombine [them] for the product to actually be used again as soil for people to take away at the end of the project”.
Let’s not compromise the future, let’s keep the soil
11 July 2019, Balcarce, Provincia de Buenos Aires, Argentina. The Integrated Unit of the Faculty of Agricultural Sciences-INTA Balcarce, the Argentine Association of Soil Science (AACS), the College of Agronomists and Foresters of Buenos Aires and the Association of Agronomists of Balcarce invite to the Soil Conservation Workshop.
Registration and programme: http://bit.ly/inscripcion_jornada
Download the programme: https://www.iuss.org/media/programa_jornada_conservaci_n_de_suelos_2019.pdf
Each year, this three-day soil identification course is held in a different region of British Columbia, Canada. The course is open to soil professionals, students, and anyone with a passion for soil! Participants learn how to texture a soil, dig soil pits, and receive an introduction to soil classification and formation. This year’s dates are yet to be defined, but visit our website for more information or become a member to receive our newsletter updates.
The PRSSS 2019 Soil ID Field Course will take place in Osoyoos, BC on August 6 – 8, 2019.
Read more: http://www.prsss.ca/summer-soil-course/
10-13 September 2019, Rostock, Germany. Peatlands cover only 3 % of the land surface worldwide but with some 450 gigatonnes of carbon they contain substantially more than the carbon stock in the entire forest biomass of the world. Thus, peatlands are the most effective terrestrial carbon stock on our globe. A mosaic of paludiculturally used peatlands with peatlands restored primarily for nature conservation purposes is the future multifunctional and sustainable peatland landscape – the vision of ‘WETSCAPES’. In WETSCAPES, in contrast to past land use approaches, the water is kept in the landscape, thus facilitating carbon storage, nutrient retention, climate regulation, and habitat function.
Read more: https://www.wetscapes.de/conference/
Download the preliminary programme: https://www.iuss.org/meetings-events/
Natural and Human-induced Impacts on the Critical Zone and Food Production
23-26 September, 2019, Bari, Italy. On behalf of the Local and Scientific Committees, we are glad to invite you to the First Joint Meeting on Soil and Plant System Sciences (SPSS 2019) organized by the Italian Society of Agricultural Chemistry (SICA), the Italian Society of Pedology (SIPe) and the Italian Society of Soil Science (SISS), in collaboration with the Mediterranean Agronomic Institute (IAM) and the Italian Chapter of the International Humic Substances Society. The title of this meeting “Natural and Human-induced Impacts on the Critical Zone and Food Production” sets up the ambitious goal of integrating scientific backgrounds and topics, all focused on the “critical zone” (where soil and living organisms interact) but starting from differing theoretical perspectives and applied approaches. Physical, chemical and biological characteristics and processes will feed and nourish the diversity of experiences, opinions and scientific knowledge.
Abstract submission deadline: 30 June 2019
Read more: https://spss2019.azuleon.org/
30 September – 11 October 2019, Tremp (Lleida), Spain. This course will comprise lectures, exercises with thin sections provided by the lecturers and also with material brought by the participants and visits to a thin section lab. Both analogic and digital polarising microscopes will be available, with a maximum of 2 participants per microscope, as well as facilities to work with them during extra time and to discuss the participants own thin sections with lecturers and colleagues. A certificate issued by the University of Lleida, under the auspices of the International Soil Science Society and the Institut Cartogràfic i Geològic de Catalunya will be handled to the participants who attend a minimum hours of lectures.
Read more: http://www.cfc.udl.cat/fc/curso/2322
Contact: rosa.poch@macs.udl.cat
6 – 11 October 2019, Adelaide, South Australia. It is of course this amorphous substance, SOM, that draws our interests together and affords us the privilege to invite you to the wonderful city of Adelaide, South Australia, where the 7th iteration of the International SOM Symposium Series will be held from 6th -11th October 2019. The conference follows the amazingly successful editions at Rothamsted Research, UK (2017), Georg-August-Universität Göttingen, Germany (2015), and their four predecessors stretching back to the initiation of the series at Potiers, France, in 2007. It draws together a vibrant mix of established world experts, early and mid-career researchers, and students in order to share knowledge, make new connections, and advance the field of SOM research.
Early Bird Registration closes 30 August 2019
Read more: http://www.som2019.org
Oktober 14-16, 2019, Innsbruck, Austria. The Alpine Soil Forum offers a place to link knowledge with practice, experts with decision-makers, local challenges with Alpine and European strategies and scientific foundations with solutions for the future. The Alpine Soil Forum will be organized together with the Austrian Soil Forum and the Austrian Pedological Society.
Read more: https://www.iuss.org/media/alpinesoilforum-links4soils-aviso_en.pdf
Joint Early Career Researchers – Soil Science Networking Event
8 Dec 2019, San Francisco, USA. Coordination: ISMC – Division 2 IUSS Working Group. We invite Early Career Scientists (ECS) at PostDoc level for an ECS workshop to discuss how you address these recent challenges through ongoing research projects. After a short introduction, participants dissolve in groups of 4-5 people to identify and work on specific questions.
Contact email: r.baatz@fz-juelich.de
Read more: https://www.iuss.org/media/lsp_workshop_v01_1.pdf
11 – 13 December 2019, Braunschweig, Germany. Tremendous progress has been made since high-throughput DNA sequencing technologies entered the field of soil microbiology, and the scientific community involved in soil omics studies is continuously growing. Continuing the legacy of the first three Thünen Symposia, we would like to provide the opportunity for participants to learn about the latest progress at the intersection of microbial bioinformatics and soil ecology. Key issues of the 4th Symposium relate to spatial organization of soil microbial communities and to the study of neglected groups, i.e. soil viruses and protists. The workshop flanking the symposium provides the opportunity to learn about techniques for metagenomic analyses and beyond (transcriptomes and proteome).
Deadline for abstract submission: Sept. 10, 2019
Preliminary Programme with Call for Abstract
Symposium website: www.soil-metagenomics.org
Further events: event calendar microbiology
Edited by Makiko Watanabe and Masayuki Kawahigashi. Published in the Part of the International Perspectives in Geography book series (IPG) by Springer in June 2019, Print ISBN 978-981-13-1752-1, Online ISBN 978-981-13-1753-8, price e-book: EUR 101.14.
This book enhances the discussion of anthropized soils with photographs of soil profiles and provides general information about soils in Japan, using data on their physical and chemical properties. Soils targeted in this book have wide spectra in anthropized influences from lesser effects such as agricultural improvements to drastic changes caused by infrastructure construction. These include soils sealed by technic hard materials, on ski slopes, on river embankments and coastal berms, in historical urban parks, on man-made islands in Tokyo Bay, in reclaimed lands, in greenhouse fields, and those filling in swamplands.
The book includes information with new data produced by active researchers from many institutes and universities as it refers to soils altered by human activities and thus is informative to specialists in various disciplines related to soils. It is also valuable to students for viewing soils in cities, infrastructure construction areas, and other affected locations. Evaluation and understanding of soils now has become essential for researchers in a range of fields and for policy makers in agriculture as well as urban planning, civil engineering, and disaster sciences. This work serves as an impetus for launching further study of soils and environments.
Read more: https://www.springer.com/de/book/9789811317521
By D. K. Pal. Published by Springer in June 2019. Print ISBN 978-3-319-89598-7, Online ISBN 978-3-319-89599-4; price e-book: EUR 91.62.
This book discusses how research efforts have established an organic link between pedology and edaphology of five pedogenetically important soil orders as Alfisols, Mollisols, Ultisols, Vertisols and Inceptisols of tropical Indian environments. The book highlights how this new knowledge was gained when research efforts were complemented by high resolution mineralogical, micro morphological and age-control tools. This advancement in basic and fundamental knowledge on Indian tropical soils makes it possible to develop several index soil properties as simple methods to study their pedology and edaphology.
More than one-third of the world’s soils are tropical soils. Thus the recent advances in developing simple and ingenuous methods to study pedology and edaphology of Indian tropical soils may also be adopted by both graduate students and young soil researchers to aid in the development of a national soil information system to enhance crop productivity and maintain soil health in the 21st century.
Read more: https://www.springer.com/de/book/9783319895987
Edited by Deepak G. Panpatte and Yogeshvari K. Jhala. Published by Springer in June 2019, Print ISBN 978-981-13-5903-3, Online ISBN 978-981-13-5904-0, price e-book: EUR 107.09
Soil fertility is the backbone of agricultural systems and plays a key role in determining food quantity and quality. In recent decades, soil fertility has decreased due to indiscriminate use of agrochemicals, and nations around the globe are now facing the challenge of increasing food production while sustainably maintaining soil fertility. Written by leading international scientists in the field, this book explores soil fertility management strategies, including agronomic, microbiological and soil-science based strategies. Highlighting the practices that can be incorporated into organic farming and discussing recent advances, it is a valuable resource for researchers wanting to broaden their vision and the scope of their investigations.
Read more: https://www.springer.com/de/book/9789811359033
By G. Jock Churchman, Bruce Velde, CRC Press, June 28, 2019, 258 pages, 27 Color Illus., 70 B/W Illus., Hardback: ISBN 9781498770057, Price GBP 130,00.
This book aims to help improve predictions of important properties of soils through a modern understanding of their highly reactive clay minerals as they are formed and occur in soils worldwide. It examines how clays occur in soils and the role of soil clays in disparate applications including plant nutrition, soil structure, and water-holding capacity, soil quality, soil shrinkage and swelling, carbon sequestration, pollution control and remediation, medicine, forensic investigation, and deciphering human and environmental histories.
To know soil clays is to enable their use toward achieving improvements in the management of soils for enhancing their performance in one or more of their three main functions of enabling plant growth, regulating water flow to plants, and buffering environmental changes. This book provides an easily-read and extensively-illustrated description of the nature, formation, identification, occurrence and associations, measurement, reactivities, and applications of clays in soils.
IUSS Alerts are e-mailed to more than 2,300 individual subscribers and 80 national soil science societies globally. Please forward the IUSS Alerts to your friends and colleagues. Send information for IUSS Alerts to iuss@umweltbundesamt.at
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Le jeudi 11 juillet 2019 de 16h à 17h30
Christine Le Souder, Ingénieure spécialisée en fertilisation, Arvalis Institut du Végétal, Boigneville
Etat des lieux de la fertilisation des grandes cultures en France :
impacts des nouvelles connaissances et du développement technologique sur les pratiques des agriculteurs.
Les pratiques de fertilisation des agriculteurs évoluent au rythme du transfert des connaissances et de l’offre technologique, mais aussi selon les enjeux environnementaux, réglementaires et économiques, de façon différente selon les éléments fertilisants.
Dans le cas de la fertilisation azotée, les innovations actuelles concernent en premier lieu la précision de la méthode du bilan prévisionnel (poste de minéralisation des MO, besoin des cultures selon leur objectif de production, prévision des pertes,…). Ces travaux sont motivés en particulier par l’utilisation croissante de sources organiques variées, abondantes dans le cadre de l’agro-écologie. La gestion de l’azote bénéficie aussi en second lieu des apports technologiques liés aux modèles de culture et aux capteurs. L’utilisation de ces nouvelles technologies doit néanmoins être cohérente avec la réglementation (Directive Nitrates).
Dans le cas de la fertilisation P et K, après de fortes avancées dans les années 1990, les travaux récents concernent principalement les indicateurs à l’analyse de terre, ainsi que l’étude de la valorisation de nouvelles sources de P, organiques ou non, issues du recyclage. Par ailleurs, la gestion du phosphore en agriculture biologique interroge et oriente aussi des travaux visant à préserver la fertilité des sols sur le long terme.
Lien pour s’inscrire au webinaire : https://attendee.gotowebinar.com/register/5513544337681856257
2019-09-19_Colloque_RMT-FE_Programme_prévisionnel.pdf