{"id":736,"date":"2020-05-20T15:26:00","date_gmt":"2020-05-20T13:26:00","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=736"},"modified":"2023-03-07T09:24:00","modified_gmt":"2023-03-07T08:24:00","slug":"quelles-pistes-pour-reduire-les-emissions-de-n2o-issues-de-lactivite-agricole","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/quelles-pistes-pour-reduire-les-emissions-de-n2o-issues-de-lactivite-agricole\/","title":{"rendered":"Pistes r\u00e9duction \u00e9missions de N2O"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Quelles pistes pour la r\u00e9duction des \u00e9missions de N<sub>2<\/sub>O issues de l\u2019activit\u00e9 agricole ?<\/h1>\n\n\n\n<p>Il est aujourd&rsquo;hui important d&rsquo;identifier les pistes de r\u00e9duction des \u00e9missions de N<sub>2<\/sub>0 issues de l&rsquo;activit\u00e9 agricole. L\u2019inventaire fran\u00e7ais des \u00e9missions anthropiques de gaz \u00e0 effet de serre (GES) indique que <strong>les \u00e9missions de N<sub>2<\/sub>O (oxyde nitreux ou protoxyde d\u2019azote) repr\u00e9sentent 10 % des \u00e9missions totales<\/strong> (CITEPA, 2014).<\/p>\n\n\n\n<p><strong>Les activit\u00e9s agricoles produisent 90 % des \u00e9missions du N<sub>2<\/sub>O <\/strong>(<a href=\"https:\/\/hal.archives-ouvertes.fr\/hal-01173314\/document\" target=\"_blank\" rel=\"noreferrer noopener\">C. LE GALL <em>et al.<\/em><\/a>). Ce gaz repr\u00e9sente alors la moiti\u00e9 des \u00e9missions de GES agricoles en France. Dont 5 % sont issues des d\u00e9jections animales. Les 45 % restants sont donc issus du processus de d\u00e9nitrification qui a lieu dans les sols.<\/p>\n\n\n\n<p><strong>N2O est un gaz \u00e0 tr\u00e8s fort pouvoir de r\u00e9chauffement climatique<\/strong>, de l\u2019ordre de 300 fois sup\u00e9rieur \u00e0 celui du dioxyde de carbone. Il intervient \u00e9galement dans la destruction de l\u2019ozone stratosph\u00e9rique (UNEP, 2013). La gestion des \u00e9missions de N<sub>2<\/sub>O li\u00e9es \u00e0 l\u2019activit\u00e9 agricole est donc aujourd\u2019hui un enjeu pour l\u2019agriculture. Diff\u00e9rents projets de recherche ont alors \u00e9t\u00e9 men\u00e9s pour<strong> :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>\u00e9valuer la capacit\u00e9 microbienne des sols fran\u00e7ais \u00e0 r\u00e9duire N<sub>2<\/sub>O en N<sub>2<\/sub><\/strong><\/li><li><strong>identifier les pratiques agronomiques favorables \u00e0 la r\u00e9duction des \u00e9missions de gaz \u00e0 effet de serre par les sols agricoles<\/strong>.\u00a0<\/li><\/ul>\n\n\n<div class=\"_3d-flip-book  fb3d-fullscreen-mode full-size\" data-id=\"734\" 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\">Le gaz  N<sub>2<\/sub>O a un tr\u00e8s fort pouvoir de r\u00e9chauffement<\/h2>\n\n\n\n<p>Le <strong>N<sub>2<\/sub>O est un gaz \u00e0 tr\u00e8s fort pouvoir de r\u00e9chauffement<\/strong>. Il repr\u00e9sente plus de la moiti\u00e9 des \u00e9missions de GES issues du secteur agricole. La<strong> gestion des \u00e9missions de ce gaz est donc un enjeu important pour l\u2019agriculture<\/strong>. Les facteurs influen\u00e7ant significativement l\u2019intensit\u00e9 des \u00e9missions de N<sub>2<\/sub>O sont les :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Pratiques agronomiques<\/strong> (fertilisation azot\u00e9e, type de culture et forme des fertilisants) <\/li><li><strong>Caract\u00e9ristiques des sols<\/strong> (teneur en carbone organique, pH et texture). <\/li><\/ul>\n\n\n\n<p>Le<strong> pH des sols semble un facteur cl\u00e9 dans le contr\u00f4le des \u00e9missions de N<sub>2<\/sub>O<\/strong>. Il l&rsquo;est \u00e9galement dans <strong>la capacit\u00e9 des sols \u00e0 r\u00e9duire N<sub>2<\/sub>O<\/strong>. En effet<strong>,<\/strong> <strong>\u00e0 des pH faibles, on observe une inhibition de l\u2019enzyme N<sub>2<\/sub>O-r\u00e9ductase<\/strong>. C&rsquo;est-\u00e0-dire que cette derni\u00e8re n\u2019arrive plus \u00e0 s\u2019assembler correctement. Le projet SOLGES a permis la r\u00e9alisation de tests sur 90 sols. Ainsi, il a permis d\u2019identifier que<strong> la capacit\u00e9 des sols \u00e0 r\u00e9duire N2O \u00e9tait fortement r\u00e9duit pour des pH inf\u00e9rieurs \u00e0 6,4<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les strat\u00e9gies de r\u00e9duction d&rsquo;\u00e9mission de N<sub>2<\/sub>O par les sols<\/h2>\n\n\n\n<p><strong>Deux strat\u00e9gies de r\u00e9duction d\u2019\u00e9missions de N<sub>2<\/sub>O par les sols<\/strong> ont \u00e9t\u00e9 \u00e9tudi\u00e9es dans diff\u00e9rents projets de recherche : <\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>am\u00e9liorer l\u2019efficacit\u00e9 de l\u2019utilisation de l\u2019azote <\/strong>\u00e0 l\u2019\u00e9chelle de la culture, <\/li><li><strong>intervenir sur le fonctionnement des processus microbiens <\/strong>impliqu\u00e9s dans les \u00e9missions de N<sub>2<\/sub>O.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">L\u2019am\u00e9lioration de l\u2019efficacit\u00e9 de l\u2019utilisation de l\u2019azote<\/h2>\n\n\n\n<p>L\u2019<strong>am\u00e9lioration de l\u2019efficacit\u00e9<\/strong> de l\u2019utilisation de l\u2019azote passe par une <strong>meilleure ad\u00e9quation entre les besoins des plantes et les apports<\/strong> (dose et date). Elle passe \u00e9galement par l\u2019<strong>introduction de l\u00e9gumineuses<\/strong> dans l\u2019assolement. <\/p>\n\n\n\n<p>Le projet PUIGES a d\u00e9montr\u00e9 l<strong>\u2019int\u00e9r\u00eat de ces cultures dans la r\u00e9duction des \u00e9missions de N<sub>2<\/sub>O<\/strong> (jusqu\u2019\u00e0 70 %). La <strong>pratique de chaulage<\/strong> a un effet positif sur la r\u00e9duction de ces \u00e9missions en agissant sur le pH et donc sur le fonctionnement des microorganismes impliqu\u00e9s dans la r\u00e9duction de N<sub>2<\/sub>O. <\/p>\n\n\n\n<p>Il c<strong>onvient toutefois d\u2019\u00e9tudier les \u00e9missions de GES issues du process de production de produits chaulant pour r\u00e9aliser un bilan de cette pratique.<\/strong> Dans les perspectives de recherche d\u2019autres solutions, le projet NATADGES a d\u00e9but\u00e9 fin 2019 (projets conjoints ISITE-BFC (Initiatives pour le site Bourgogne-Franche-Comt\u00e9 port\u00e9 par ladite universit\u00e9). Son objectif est d\u2019\u00e9tudier l\u2019utilisation d\u2019additifs naturels ou de micro-organismes pour \u00e9viter les \u00e9missions de gaz \u00e0 effet de serre N<sub>2<\/sub>O par le sol, \u00e0 diff\u00e9rentes \u00e9chelles.<\/p>\n\n\n\n<p>Retrouvez toutes nos publications pour la <a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/category\/changement-climatique\/reduire-lemission-de-ges\/\" target=\"_blank\" rel=\"noreferrer noopener\">r\u00e9duction des gaz \u00e0 effet<\/a> de serre sur notre site internet.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;dentification des pratiques agronomiques favorables \u00e0 la r\u00e9duction des \u00e9missions de N2O, gaz \u00e0 effet de serre, par les sols agricoles.<\/p>\n","protected":false},"author":4,"featured_media":1430,"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_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[30,35],"tags":[],"class_list":["post-736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-changement-climatique","category-reduire-lemission-de-ges"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pistes r\u00e9duction \u00e9missions de N2O - L&#039;ARAD2<\/title>\n<meta name=\"description\" content=\"Identification des pratiques agronomiques favorables 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