{"id":2476,"date":"2023-03-22T11:45:15","date_gmt":"2023-03-22T10:45:15","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=2476"},"modified":"2023-03-22T12:06:06","modified_gmt":"2023-03-22T11:06:06","slug":"stimuler-les-defenses-naturelles-des-plantes","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/stimuler-les-defenses-naturelles-des-plantes\/","title":{"rendered":"Stimuler les d\u00e9fenses naturelles des plantes"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Les extraits ferment\u00e9s d&rsquo;ortie pour stimuler les d\u00e9fenses naturelles des plantes<\/h1>\n\n\n\n<p>Antoine CHEDRU, agriculteur DEPHY dans le Pays de Caux en Seine Maritime s&rsquo;est lanc\u00e9 dans l&rsquo;utilisation des extraits ferment\u00e9s pour stimuler les d\u00e9fenses naturelles de plantes. Ce lancement a fait suite \u00e0 une formation de cinq jours avec le GIEE Sol en Caux chez Eric Petiot en 2015. Suite \u00e0 cette formation, la pratique a \u00e9t\u00e9 test\u00e9e par plusieurs agriculteurs. Ils ont mis en place des essais simultan\u00e9ment, facilitant ainsi les \u00e9changes techniques et la comparaison des r\u00e9sultats obtenus. Antoine CHEDRU a ensuite perfectionn\u00e9 la pratique en travaillant sur la qualit\u00e9 de l\u2019eau et affiner les stades d\u2019interventions. D\u00e9couvrez la fiche \u00ab\u00a0<a href=\"https:\/\/ecophytopic.fr\/\" target=\"_blank\" rel=\"noreferrer noopener\">Pratiques remarquables<\/a>\u00a0\u00bb r\u00e9alis\u00e9e dans le cadre du r\u00e9seau DEPHY :<\/p>\n\n\n<div class=\"_3d-flip-book  fb3d-fullscreen-mode full-size\" data-id=\"2481\" 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<h2 class=\"wp-block-heading\">Les attentes d&rsquo;Antoine CHEDRU<\/h2>\n\n\n\n<p>Son objectif est de r\u00e9duire drastiquement l\u2019utilisation de fongicides et se passer d\u2019insecticides de synth\u00e8se \u00e0 l\u2019\u00e9chelle de son syst\u00e8me de culture. Il vise la r\u00e9duction maximale de fongicides et la suppression des insecticides. Il souhaite \u00e9galement allier protection fongique et pr\u00e9servation de l\u2019\u00e9tat biologique de ses sols par l\u2019utilisation des extraits ferment\u00e9s. Enfin,\u00a0 il\u00a0y voit une diminution de certaines charges et une am\u00e9lioration de la marge brute globale de son syst\u00e8me.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Mise en oeuvre et conditions de r\u00e9ussite pour stimuler les d\u00e9fenses naturelles des plantes<\/h2>\n\n\n\n<p>Pour lui, une bonne pr\u00e9paration de la mati\u00e8re premi\u00e8re est primordiale dans la r\u00e9ussite de la pratique. Le meilleur stade pour la fauche des orties est avant floraison. Le suivi de la mac\u00e9ration est \u00e9galement essentiel dans la r\u00e9ussite de la pratique. Les contr\u00f4les r\u00e9guliers du redox, de la conductivit\u00e9, du pH, s\u2019av\u00e8rent indispensables afin d\u2019obtenir les meilleures conditions possibles avant filtration. Les r\u00e9sultats obtenus sont confirm\u00e9s par la mise en place d\u2019essais et des relev\u00e9s aux champs dans le cadre du groupe DEPHY. Les observations et les mesures (analyses de s\u00e8ve, mesure du taux de Brix) sont \u00e9galement n\u00e9cessaires afin de d\u00e9terminer pr\u00e9cis\u00e9ment les meilleures conditions d\u2019intervention.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les avantages et les limites des extraits ferment\u00e9s d&rsquo;ortie<\/h2>\n\n\n\n<p>D&rsquo;apr\u00e8s Antoine CHEDRU, les principes avantages sont :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>une baisse significative des IFT fongicides et insecticides depuis 5 ans,<\/li><li>un effet non d\u00e9pressif sur les rendements,<\/li><li>une pratique relativement peu co\u00fbteuse \u00e0 hauteur de 50 centimes le litre, \u00e9quivalent \u00e0 10 \u20ac le passage,<\/li><li>une am\u00e9lioration de la marge brute globale.<\/li><\/ul>\n\n\n\n<p>Les limites sont :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>un nombre important de passages n\u00e9cessaires pour valoriser les extraits,<\/li><li>une justification aupr\u00e8s des riverains sur le nombre de sorties du pulv\u00e9risateur,<\/li><li>une observation fine des parcelles pour d\u00e9clencher les interventions qui n\u00e9cessite un temps important.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">T\u00e9moignage d&rsquo;Antoine CHEDRU<\/h2>\n\n\n\n<p>\u00ab <em>On a jamais vu d\u2019effets n\u00e9gatifs sur les rendements tous les t\u00e9moins et autres essai que l\u2019on a fait, il y a un petit effet oligo\u00e9l\u00e9ment et sur les insectes aussi, donc on continue<\/em> \u00bb. <\/p>\n\n\n\n<p><em>\u00ab Il faut bien prendre en compte que c\u2019est une combinaison de pratiques, ce n\u2019est pas simplement les extraits seuls, il y a l\u2019activit\u00e9 biologique de son sol, un suivi dans la nutrition des cultures [\u2026] je r\u00e9alise des analyses de terre et de s\u00e8ve r\u00e9guli\u00e8rement sur les parcelles, cela peut \u00eatre <\/em>deux<em> \u00e0 <\/em>trois<em> analyses de s\u00e8ve en v\u00e9g\u00e9tation et je compl\u00e8te par l\u2019apport de micro doses d\u2019oligo\u00e9l\u00e9ments \u00bb.<\/em><\/p>\n\n\n\n<p>\u00ab <em>Une des limite est le nombre de sortie du pulv\u00e9risateur qui peut \u00eatre important, le pulv\u00e9 il sort plus pour \u00e9pandre des extraits ferment\u00e9s de plante, des huiles essentielles que des mati\u00e8res actives de synth\u00e8se c \u2019est \u00e9norm\u00e9ment de passages c\u2019est pas tr\u00e8s bien vu de la population ext\u00e9rieur, maintenant on a les panneaux Ecophyto on communique beaucoup sur ce domaine l\u00e0<\/em> \u00bb<\/p>\n\n\n\n<p>\u00ab<em> Pour cette pratique il faut commencer par une formation. Partir tout seul, sans exp\u00e9rience, c\u2019est aller au casse-pipe. Il y a des erreurs \u00e0 \u00e9viter, comme j\u2019ai vu dans certains reportages, telle que la fauche de l\u2019ortie en fleur alors qu\u2019elle a perdu tous ses oligo\u00e9l\u00e9ments [\u2026] une formation c\u2019est essentielle !<\/em> \u00bb<\/p>\n\n\n\n<p>\u00ab <em>C\u2019est une technique qui me permet de baisser mes IFT sans impacter n\u00e9gativement le rendement <\/em>[&#8230;]<em> c\u2019est une pratique qui \u00e0 un tr\u00e8s bon retour positif aupr\u00e8s de la population<\/em>. <em>Par contre au sein du milieu agricole c\u2019est plus compliqu\u00e9. Il y a certains agriculteurs qui ne voient pas les effets et les avantages de ce genre de pratiques<\/em>. <em>Il y a encore des progr\u00e8s \u00e0 faire dans ce sens <\/em>\u00bb.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">L&rsquo;avis de l&rsquo;ing\u00e9nieur r\u00e9seau Dephy sur les extraits ferment\u00e9s d&rsquo;ortie<\/h2>\n\n\n\n<p>D&rsquo;apr\u00e8s Simon PESQUET, charg\u00e9e de mission agronomie et ing\u00e9nieur Dephy au Cerfrance Normandie Maine, l\u2019utilisation des extraits ferment\u00e9s de plantes font parties des pratiques \u00e9mergentes de plus en plus mobilis\u00e9es par les agriculteurs. En plus de renforcer l\u2019autonomie de l\u2019agriculteur dans ses strat\u00e9gies de protection des cultures, les r\u00e9sultats obtenus sont pr\u00e9sents. En t\u00e9moigne, les essais men\u00e9s chez Antoine CHEDRU depuis 2016 qui ont permis de mettre \u00e9vidence l\u2019effet biostimulant des extraits ferment\u00e9s d\u2019ortie sur le bl\u00e9 \u00e0 la fois sur la r\u00e9sistance aux bioagresseurs et sur le gain de rendement.<\/p>\n\n\n\n<p>La r\u00e9ussite de cette pratique d\u00e9pend d\u2019une strat\u00e9gie globale et d\u2019une combinaison de leviers agronomiques :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>diversit\u00e9 spatiotemporelle, <\/li><li>date de semis tardive, <\/li><li>\u00e9viter les exc\u00e8s de densit\u00e9, <\/li><li>une fertilisation fine et raisonn\u00e9e.<\/li><\/ul>\n\n\n\n<p>Cette pratique n\u00e9cessite \u00e9galement une technicit\u00e9 et un temps d\u2019observation important, notamment dans le suivi de la pr\u00e9paration et dans le d\u00e9clenchement des interventions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Am\u00e9lioration et autres usages envisag\u00e9s des extraites ferment\u00e9s d&rsquo;ortie<\/h2>\n\n\n\n<p>Des travaux de recherche se poursuivent sur de nouvelles plantes \u00e0 utiliser. La consoude, \u00e0 l\u2019effet biostimulant en d\u00e9but de cycle, est arriv\u00e9e apr\u00e8s l\u2019ortie en 2017. Les deux esp\u00e8ces peuvent s&rsquo;utiliser en m\u00e9lange. La foug\u00e8re a des r\u00e9sultats \u00e9galement int\u00e9ressants. Mais elle n\u2019est pas encore utilis\u00e9e par Antoine CHEDRU. Utilis\u00e9s \u00e0 l\u2019origine sur bl\u00e9, les extraits s&rsquo;appliquent d\u00e9sormais sur toutes les cultures d\u00e8s le semis et sur les couverts v\u00e9g\u00e9taux. En parall\u00e8le, un gros travail est r\u00e9alis\u00e9 sur l\u2019eau de pulv\u00e9risation, sur la qualit\u00e9 du filtrage de l\u2019eau afin d\u2019obtenir une eau avec une qualit\u00e9 optimale.<\/p>\n\n\n\n<p>Antoine CHEDRU teste depuis plusieurs ann\u00e9es les&nbsp;<strong>extraits ferment\u00e9s de plantes<\/strong>&nbsp;\u00e0 base d\u2019ortie, de consoude, de pr\u00eale et de foug\u00e8re&nbsp;<strong>pour prot\u00e9ger ses cultures avec moins de produits phytosanitaires<\/strong>. Il nous explique comment il fabrique ces produits \u00e0 partir notamment d\u2019orties qu\u2019il fait pousser dans une de ces parcelles <a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/extraits-fermentes-plantes-dephy\/\" target=\"_blank\" rel=\"noreferrer noopener\">dans cette vid\u00e9o<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les extraits ferment\u00e9s d\u2019ortie pour stimuler les d\u00e9fenses naturelles des plantes<\/p>\n","protected":false},"author":4,"featured_media":2485,"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":"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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