{"id":2407,"date":"2023-02-15T18:36:46","date_gmt":"2023-02-15T17:36:46","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=2407"},"modified":"2024-02-07T12:23:05","modified_gmt":"2024-02-07T11:23:05","slug":"dynmique-adventices-et-effet-des-itineraires-techniques-alternatifs-au-glyphosathe","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/dynmique-adventices-et-effet-des-itineraires-techniques-alternatifs-au-glyphosathe\/","title":{"rendered":"Dynamique des adventices"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Dynamique des adventices sous l&rsquo;effet d&rsquo;itin\u00e9raires techniques alternatifs \u00e0 l&rsquo;usage de glyphosate en semis direct sous couvert vivant<\/h1>\n\n\n\n<p>Bruno CHAUVEL et St\u00e9phane CORDEAU de l<a href=\"https:\/\/umr-agroecologie.dijon.hub.inrae.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">&lsquo;UMR Agro\u00e9cologie Dijon &#8211; INRAE <\/a>nous pr\u00e9sentent les principaux enseignements des trois campagnes d&rsquo;exp\u00e9rimentation men\u00e9es dans le cadre du projet ENGAGED sur la<strong> dynamique des adventices dans les syst\u00e8mes en semis direct sous couvert vivant<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-embed aligncenter is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Dynamique des adventices sous l&#039;effet d&#039;IT alternatifs \u00e0 l&#039;usage de glyphosathe en SDCV\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/Nxw2zzwAMy0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><figcaption class=\"wp-element-caption\"><em>Dynamique des adventices sous l&rsquo;effet d&rsquo;itin\u00e9raires techniques alternatifs \u00e0 l&rsquo;usage de glyphosate en semis direct sous couvert vivant<\/em><\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Les strat\u00e9gies test\u00e9es<\/h2>\n\n\n\n<p>Les <strong>diff\u00e9rentes strat\u00e9gies test\u00e9es <\/strong>\u00e9taient donc :&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>substituer le glyphosate<\/strong> par un autre gestion chimique,<\/li>\n\n\n\n<li><strong>r\u00e9guler m\u00e9caniquement<\/strong> le couvert avant semis de la culture,<\/li>\n\n\n\n<li><strong>augmenter la comp\u00e9tition<\/strong> de la culture par sa densit\u00e9 de semis,<\/li>\n\n\n\n<li><strong>limiter le recours aux herbicides<\/strong> en culture.<\/li>\n<\/ul>\n\n\n\n<p>Sur les essais men\u00e9s (<a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/casdar-engaged-presentation-des-trois-campagnes-experimentations\/\" target=\"_blank\" rel=\"noreferrer noopener\">pr\u00e9sentation d\u00e9taill\u00e9e des essais<\/a>), des <strong>mesures de flore adventice ont alors \u00e9t\u00e9 r\u00e9alis\u00e9es par comptage<\/strong>. L&rsquo;<strong>estimation visuelle <\/strong>a \u00e9galement \u00e9t\u00e9 utilis\u00e9e pour \u00e9valuer la pression adventices. Elles ont aussi \u00e9t\u00e9 compl\u00e9t\u00e9es par des <strong>mesures de&nbsp;taux de couverture et de biomasses<\/strong> pour les adventices, couvert et culture. L&rsquo;objectif \u00e9tait donc d&rsquo;\u00e9valuer le niveau de comp\u00e9tition entre ces trois cat\u00e9gories.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les principaux r\u00e9sultats<\/h2>\n\n\n\n<p>Les <strong>principaux r\u00e9sultats<\/strong> sont donc :&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>quand on ne fait que retirer le glyphosate, la premi\u00e8re adventice qui vient concurrencer le bl\u00e9, c&rsquo;est le tr\u00e8fle qui est install\u00e9. M\u00eame si le tr\u00e8fle est une l\u00e9gumineuse et qu&rsquo;il ne rentre pas en concurrence pour l&rsquo;azote, pour la lumi\u00e8re c&rsquo;est diff\u00e9rent.&nbsp;<\/li>\n\n\n\n<li>la substitution chimique du glyphosate par d&rsquo;autres herbicides utilis\u00e9s plus tardivement&nbsp; n&rsquo;a pas permis une bonne r\u00e9gulation du tr\u00e8fle. La cons\u00e9quence est l&rsquo;apparition d&rsquo;une comp\u00e9tition entre tr\u00e8fle et bl\u00e9 impactant le rendement. La cons\u00e9quence est identique lorsque cette substitution est associ\u00e9e \u00e0 un broyage du couvert avant semis du bl\u00e9<\/li>\n\n\n\n<li>une densit\u00e9 de semis du bl\u00e9 plus forte \u00e0 600 grains\/m\u00b2 permet un niveau de couverture du bl\u00e9 similaire entre les modalit\u00e9s avec ou sans glyphosate. La perte de rendement du bl\u00e9 est ainsi limit\u00e9e. Mais il n&rsquo;y a pas d&rsquo;action sur la densit\u00e9 d&rsquo;adventices. Cette derni\u00e8re reste toutefois \u00e0 un niveau trop \u00e9lev\u00e9 pour \u00eatre acceptable par les agriculteurs.<\/li>\n<\/ul>\n\n\n\n<p>Le projet Casdar ENGAGED est un projet multipartenariat avec :&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ARAD\u00b2 \u2013 Cerfrance Normandie Maine,&nbsp;<\/li>\n\n\n\n<li>INRAE,&nbsp;<\/li>\n\n\n\n<li>F\u00e9d\u00e9ration des CUMA Normandie Ouest,&nbsp;<\/li>\n\n\n\n<li>Institut Polytechnique&nbsp;UniLaSalle.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p>Vous pouvez \u00e9galement retrouver toutes nos publications en lien sur le projet&nbsp;<a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/category\/projets-de-recherche-arad2\/casdar-engaged\/\" target=\"_blank\" rel=\"noreferrer noopener\">CASDAR ENGAGED sur notre site internet<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dynamique des adventices sous l&rsquo;effet d&rsquo;itin\u00e9raires techniques alternatifs \u00e0 l&rsquo;usage de glyphosate en semis direct sous couvert vivant<\/p>\n","protected":false},"author":4,"featured_media":2408,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","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":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","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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