{"id":886,"date":"2019-03-20T18:32:00","date_gmt":"2019-03-20T17:32:00","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=886"},"modified":"2023-03-07T09:24:03","modified_gmt":"2023-03-07T08:24:03","slug":"gestion-des-adventices-quelques-enseignements-du-projet-cosac","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/gestion-des-adventices-quelques-enseignements-du-projet-cosac\/","title":{"rendered":"Le Projet CoSAC"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Gestion des adventices : quelques enseignements du projet CoSAC<\/h1>\n\n\n\n<p>Dans cette publication nous allons pr\u00e9senter les <strong>enseignements du projet CoSAC sur la gestion des adventices.<\/strong> La flore adventice est un facteur de r\u00e9duction de la production. Mais elle est \u00e9galement un des piliers de la biodiversit\u00e9 des paysages agricoles. Dans le contexte actuel, l<strong>\u2019enjeu est de proposer aux agriculteurs des syst\u00e8mes de culture permettant de concilier r\u00e9duction d\u2019usage des herbicides, production agricole et conservation de la biodiversit\u00e9 en grandes cultures<\/strong>. Pour y r\u00e9pondre, ce projet avait pour objectifs de :<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li><strong>quantifier et comprendre les effets de pratiques agricoles innovantes <\/strong>sur les adventices et le fonctionnement de l\u2019agro\u00e9cosyst\u00e8me, <\/li><li><strong>d\u00e9velopper des outils<\/strong> pr\u00e9disant les effets des pratiques agricoles et du p\u00e9doclimat sur la flore adventice, <\/li><li><strong>utiliser ces outils<\/strong>, pour concevoir des strat\u00e9gies de gestion durable des adventices et \u00e9valuer leurs performances dans diff\u00e9rents contextes de changement,<\/li><li><strong>permettre l\u2019adoption de ces strat\u00e9gies<\/strong> par les agriculteurs.<\/li><\/ol>\n\n\n<div class=\"_3d-flip-book  fb3d-fullscreen-mode full-size\" data-id=\"885\" data-mode=\"fullscreen\" data-title=\"false\" data-template=\"short-white-book-view\" data-lightbox=\"dark-shadow\" data-urlparam=\"fb3d-page\" data-page-n=\"0\" data-pdf=\"\" data-tax=\"null\" data-thumbnail=\"\" data-cols=\"3\" data-book-template=\"default\" data-trigger=\"\"><\/div><script type=\"text\/javascript\">window.FB3D_CLIENT_DATA = window.FB3D_CLIENT_DATA || [];FB3D_CLIENT_DATA.push('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');window.FB3D_CLIENT_LOCALE && FB3D_CLIENT_LOCALE.render && FB3D_CLIENT_LOCALE.render();<\/script>\n\n\n\n<p>Pour en savoir plus sur le projet CoSAC vous pouvez vous rendre sur le <a href=\"https:\/\/www.projet-cosac.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">site de l&rsquo;INRAe<\/a>. Le s\u00e9minaire final a eu lieu d\u00e9but 2019.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La r\u00e9duction de l&rsquo;usage des produits phytosanitaire<\/h2>\n\n\n\n<p>Dans le contexte de r\u00e9duction de l\u2019usage des produits phytosanitaires, une gestion des adventices ma\u00eetris\u00e9e est un enjeu fort pour les agriculteurs. Car la flore adventice est un<br>facteur important de r\u00e9duction de la production. Cela passe par une combinaison judicieuse de pratiques pour construire un syst\u00e8me de culture r\u00e9pondant \u00e0 cet enjeu. Le projet CoSAC avait notamment pour objectifs de quantifier les effets des pratiques agricoles innovantes sur les adventices et le fonctionnement des agro\u00e9cosyst\u00e8mes. De plus, il devait proposer des outils pour concevoir des strat\u00e9gies de gestion durable des adventices. En ainsi, pouvoir il devait \u00e9valuer leurs performances dans diff\u00e9rents contextes de changement. De nombreuses \u00e9tudes ont \u00e9t\u00e9 men\u00e9es dans ce cadre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les travaux du projet CoSAC<\/h2>\n\n\n\n<p>Des travaux sur le lien entre adventices et pertes de rendement ont mis en \u00e9vidence que la perte de rendement induite par les adventices n\u2019\u00e9tait pas fonction de la densit\u00e9. Mais elle est du au rapport biomasse adventices sur biomasse de la culture. Par ailleurs, il n\u2019y a pas de relation entre le niveau d\u2019usage d\u2019herbicide pratiqu\u00e9 d\u2019une part (IFT) et le rendement ou la flore pr\u00e9sente d\u2019autre part. Enfin, la suppression des herbicides sans autre changement de pratiques augmente la perte de rendement. Ceci est due aux adventices.<\/p>\n\n\n\n<p>Cultures et adventices sont en comp\u00e9tition pour les ressources notamment la lumi\u00e8re. Ainsi, choisir des cultures comp\u00e9titives est peut-\u00eatre un des leviers de gestion int\u00e9gr\u00e9e des adventices. Pour cela, il convient d\u2019identifier les d\u00e9terminants de la comp\u00e9titivit\u00e9 de la culture et des adventices. Les chercheurs ont toutefois montr\u00e9 que les caract\u00e9ristiques qui rendent les cultures comp\u00e9titives envers les adventices sont aussi celles qui r\u00e9duisent le potentiel de rendement. Ceci est probablement du \u00e0 cause du co\u00fbt impliqu\u00e9 pour d\u00e9velopper ces caract\u00e9ristiques. Ces derni\u00e8res sont des feuilles plus larges et fines, ainsi que des plantes plus larges par unit\u00e9 de biomasse. Des travaux de s\u00e9lection seront \u00e0 mener pour concilier potentiel de rendement et faible perte de rendement due aux adventices.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Evaluation des performances des syst\u00e8mes innovants<\/h2>\n\n\n\n<p>Certains syst\u00e8mes innovants ont fait l\u2019objet d\u2019\u00e9valuation de leurs performances en termes de gestion des adventices. Une attention particuli\u00e8re a \u00e9t\u00e9 port\u00e9e aux syst\u00e8mes en semis direct sous couvert. Car d\u2019une part, ces syst\u00e8mes interrogent sur la pertinence des m\u00e9thodes classiques d\u2019\u00e9chantillonnage. D\u2019autre part, ces syst\u00e8mes se \u00ab privent \u00bb du travail du sol,<br>comptant notamment sur les couverts pour g\u00e9rer les adventices. Un essai factoriel men\u00e9 entre 2016 et 2019 (4 facteurs et 180 microparcelles) a ainsi \u00e9tudi\u00e9 l\u2019effet de diff\u00e9rents types de couverts sur les adventices. Il a pris en compte diff\u00e9rents niveaux de ressources en eau et en azote, en interculture durant la croissance du couvert puis dans les cultures suivantes. Il en ressort que les couverts produisant le plus de biomasse ne comprennent pas de l\u00e9gumineuses (ce qui ne veut pas dire que les l\u00e9gumineuses ne rendent pas d\u2019autres services !). De plus, une augmentation du nombre d\u2019esp\u00e8ces cultiv\u00e9es dans un m\u00e9lange (passer de 2 \u00e0 8) ne permet pas de mieux concurrencer les adventices. Par ailleurs, un apport d\u2019azote au semis, s\u2019il permet de produire plus de biomasse, ne r\u00e9duit toutefois pas le salissement dans le couvert. <\/p>\n\n\n\n<p>Enfin sans surprise, c\u2019est la destruction chimique du couvert (versus gel ou rouleau faca) qui permet la meilleure r\u00e9gulation des adventices dans la culture suivante. En conclusion, les couverts ne peuvent \u00e0 eux seuls assurer une r\u00e9gulation compl\u00e8te des adventices. Mais, ils doivent \u00eatre appuy\u00e9s par d\u2019autres pratiques \u00e0 l\u2019\u00e9chelle de la rotation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les travaux sur l&rsquo;agriculture de pr\u00e9cision<\/h2>\n\n\n\n<p>Des travaux ont \u00e9galement \u00e9t\u00e9 men\u00e9s sur l\u2019agriculture de pr\u00e9cision. Ces travaux se sont ax\u00e9s plus particuli\u00e8rement au travers de la d\u00e9tection non supervis\u00e9e des adventices. Ils ont utilis\u00e9 une combinaison d\u2019images spectrales et spatiales. Cette combinaison am\u00e9liore la d\u00e9tection d\u2019adventices de 10 \u00e0 14 % par rapport \u00e0 du seul spectral. A terme, ces algorithmes doivent pouvoir \u00eatre int\u00e9gr\u00e9s dans des robots de d\u00e9sherbage autonomes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gestion des adventices : quelques enseignements du projet CoSAC<\/p>\n","protected":false},"author":4,"featured_media":1599,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[41,32],"tags":[],"class_list":["post-886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-proteger-les-cultures","category-reductions-dintrants-en-cultures-et-en-elevage"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le Projet CoSAC - L&#039;ARAD2<\/title>\n<meta name=\"description\" content=\"Le projet CoSAC : conciliation r\u00e9duction d\u2019usage des herbicides, production agricole et conservation de la biodiversit\u00e9 en grandes cultures.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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