{"id":12068,"date":"2025-08-22T13:44:03","date_gmt":"2025-08-22T17:44:03","guid":{"rendered":"https:\/\/maizex.com\/mais-ensilage-et-secheresse-2025\/"},"modified":"2025-12-10T12:05:37","modified_gmt":"2025-12-10T17:05:37","slug":"mais-ensilage-et-secheresse-2025","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/mais-ensilage-et-secheresse-2025\/","title":{"rendered":"Ma\u00efs ensilage et s\u00e9cheresse 2025"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-8f761849 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-left has-medium-font-size wp-block-paragraph\">La saison de croissance 2025 a \u00e9t\u00e9 marqu\u00e9e par des conditions chaudes et particuli\u00e8rement s\u00e8ches, affectant de mani\u00e8re variable les r\u00e9gions agricoles du Qu\u00e9bec. En cons\u00e9quence, la r\u00e9colte de l\u2019ensilage de ma\u00efs d\u00e9bute d\u00e8s le mois d\u2019ao\u00fbt. L\u2019un des enjeux majeurs actuellement est le risque de concentration \u00e9lev\u00e9e de nitrates dans les plants r\u00e9colt\u00e9s. Quel est l\u2019impact sur le rendement et la qualit\u00e9 de l\u2019ensilage? Quelle strat\u00e9gie de r\u00e9colte adopter et comment g\u00e9rer l\u2019ensilage dans ce contexte ? Voici nos recommandations.<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><style>.kb-image12068_a54d31-05.kb-image-is-ratio-size, .kb-image12068_a54d31-05 .kb-image-is-ratio-size{max-width:500px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image12068_a54d31-05.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image12068_a54d31-05 .kb-image-is-ratio-size{align-self:unset;}.kb-image12068_a54d31-05{max-width:500px;}.image-is-svg.kb-image12068_a54d31-05{-webkit-flex:0 1 100%;flex:0 1 100%;}.image-is-svg.kb-image12068_a54d31-05 img{width:100%;}.kb-image12068_a54d31-05 .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<figure class=\"wp-block-kadence-image kb-image12068_a54d31-05 size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14-1024x683.jpg\" alt=\"\" class=\"kb-img wp-image-11817\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14-1024x683.jpg 1024w, https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14-300x200.jpg 300w, https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14-768x512.jpg 768w, https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14-600x400.jpg 600w, https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14-860x573.jpg 860w, https:\/\/maizex.com\/wp-content\/uploads\/Norfolk-Aug-14.jpg 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Impact sur le rendement<\/strong><br>Les rendements du ma\u00efs ensilage peuvent varier entre 50 \u00e0 90 % de la normale selon le moment et la dur\u00e9e du stress. Ce ph\u00e9nom\u00e8ne s\u2019explique par une r\u00e9duction de la hauteur des plants et une croissance limit\u00e9e des grains. La sortie des soies est la p\u00e9riode la plus critique \u00e0 prot\u00e9ger contre la s\u00e9cheresse, tandis que le d\u00e9but de la phase v\u00e9g\u00e9tative est moins sensible. Durant la p\u00e9riode allant du gonflement au stade p\u00e2teux, la s\u00e9cheresse peut entra\u00eener des pertes de 20 \u00e0 40 %. Les hybrides varient grandement dans leur capacit\u00e9 \u00e0 tol\u00e9rer la s\u00e9cheresse.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Qualit\u00e9 de l\u2019ensilage<\/strong><br>L\u2019\u00e9nergie sera principalement sous forme de sucres et de fibres dans la plante, plut\u00f4t qu\u2019en amidon dans le grain. Selon l\u2019Universit\u00e9 du Michigan, les stress de s\u00e9cheresse durant la phase v\u00e9g\u00e9tative favorisent la digestibilit\u00e9 de la fibre. Le niveau d\u2019\u00e9nergie d\u2019un ensilage de ma\u00efs stress\u00e9 par la s\u00e9cheresse peut diminuer de 15 \u00e0 35 %, en raison d\u2019une faible formation de grains dans les \u00e9pis.<br>Cependant, la grande variabilit\u00e9 des champs expos\u00e9s \u00e0 la s\u00e9cheresse peut affecter la qualit\u00e9 de l\u2019ensilage. Il est recommand\u00e9 de r\u00e9aliser des analyses r\u00e9guli\u00e8res pendant la p\u00e9riode d\u2019alimentation pour surveiller la mati\u00e8re s\u00e8che, la NDF, la digestibilit\u00e9 de la NDF, les sucres et l\u2019amidon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Humidit\u00e9 optimale pour r\u00e9colter en ensilage<\/strong><br>Pour permettre une fermentation efficace, il est recommand\u00e9 de r\u00e9colter le ma\u00efs ensilage \u00e0 une humidit\u00e9 situ\u00e9e entre 60 et 70 %, soit une mati\u00e8re s\u00e8che de 30 \u00e0 40 %. L\u2019ensilage doit fermenter pendant au moins trois semaines avant d\u2019\u00eatre distribu\u00e9 aux animaux, ce qui permet de r\u00e9duire les nitrates de 25 \u00e0 75 %. L\u2019utilisation d\u2019un inoculant est fortement conseill\u00e9e pour am\u00e9liorer la fermentation. Ne pas ajouter d\u2019ur\u00e9e ou de solution azot\u00e9e afin de limiter les risques de toxicit\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>M\u00e9thodes de r\u00e9colte \u00e0 \u00e9viter<\/strong><br>La p\u00e2ture directe ou l\u2019ensilage en vert sont fortement d\u00e9conseill\u00e9s, car elles pr\u00e9sentent un risque \u00e9lev\u00e9 d\u2019ingestion de nitrates par les animaux.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Gestion des nitrates<\/strong><br>Les plants de ma\u00efs absorbent l\u2019azote du sol, mais en p\u00e9riode s\u00e8che, ils ne peuvent l\u2019utiliser efficacement. Cela entra\u00eene une accumulation de nitrates \u00e0 la base des tiges. Pour r\u00e9duire ce risque, il est conseill\u00e9 de couper les plants \u00e0 30 cm de hauteur. En cas de pluie abondante, \u00e9vitez d\u2019ensiler dans les cinq jours suivants, car les plants peuvent se gorger de nitrates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Analyse des nitrates<\/strong><br>Il est recommand\u00e9 d\u2019envoyer vos \u00e9chantillons au laboratoire pour analyser le niveau de nitrate. L\u2019ensilage de ma\u00efs ne devrait pas d\u00e9passer 1000 ppm. Entre 1000 et 4000 ppm, il est n\u00e9cessaire de diluer l\u2019ensilage dans la ration. Le test des tiges \u00e0 l\u2019acide sulfurique n\u2019est pas fiable \u00e0 ce stade de r\u00e9colte. Seul le laboratoire peut fournir une analyse pr\u00e9cise.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>S\u00e9curit\u00e9 : formation de gaz toxiques<\/strong><br>Lors de la mise en silo, du dioxyde d\u2019azote (NO\u2082), un gaz asphyxiant, peut se former. Ce gaz peut causer des l\u00e9sions pulmonaires graves et entra\u00eener la mort. Il est imp\u00e9ratif de respecter les consignes suivantes :<br>\u2013 Suivre toutes les proc\u00e9dures de s\u00e9curit\u00e9 recommand\u00e9es pour les gaz dangereux<br>\u2013 Laisser fonctionner le souffleur lors de toute entr\u00e9e dans le silo<br>\u2013 En cas d\u2019irritation \u00e0 la gorge, consulter un m\u00e9decin imm\u00e9diatement<br>\u2013 Fermer les portes entre le silo et l\u2019\u00e9table pour prot\u00e9ger les animaux<br>\u2013 Ventiler la chambre des silos<br>\u2013 Ne pas monter dans le silo durant les deux semaines suivant l\u2019ensilage<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pour en savoir plus<\/strong><br>Consultez les ressources suivantes pour plus d\u2019informations :<br><a href=\"http:\/\/www.omafra.gov.on.ca\/french\/crops\/facts\/drought.htm\">www.omafra.gov.on.ca\/french\/crops\/facts\/drought.htm<\/a><br><a href=\"http:\/\/www.extension.iastate.edu\/CropNews\/2012\/0724ensleyhoyer.htm\">http:\/\/www.extension.iastate.edu\/CropNews\/2012\/0724ensleyhoyer.htm<\/a><br><a href=\"https:\/\/extension.psu.edu\/managing-drought-stressed-corn\">https:\/\/extension.psu.edu\/managing-drought-stressed-corn<\/a><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><\/blockquote>\n\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12068_6bd2be-e9 .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12068_6bd2be-e9 .kt-divider{border-top-width:1px;height:1px;border-top-color:#eee;width:80%;border-top-style:solid;}<\/style>\n<div class=\"wp-block-kadence-spacer aligncenter kt-block-spacer-12068_6bd2be-e9\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Pascal Larose agr.<\/em><br>Chef de produits et agronomie<br>Qu\u00e9bec et Maritimes<br>Semences Maizex<\/p>\n\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12068_65e932-43 .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12068_65e932-43 .kt-divider{border-top-width:1px;height:1px;border-top-color:#eee;width:80%;border-top-style:solid;}<\/style>\n<div class=\"wp-block-kadence-spacer aligncenter kt-block-spacer-12068_65e932-43\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"2560\" height=\"1280\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-scaled.jpg\" alt=\"\" class=\"wp-image-12071\" style=\"width:800px\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-scaled.jpg 2560w, https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-300x150.jpg 300w, https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-1024x512.jpg 1024w, https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-768x384.jpg 768w, https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-1536x768.jpg 1536w, https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-2048x1024.jpg 2048w, https:\/\/maizex.com\/wp-content\/uploads\/Maizex-endorsed-Alimentez-lexcellence-365-860x430.jpg 860w\" sizes=\"auto, (max-width: 2560px) 100vw, 2560px\" \/><figcaption class=\"wp-element-caption\">Ration 365 est une initiative de Maizex visant \u00e0 fournir des informations agronomiques sur le ma\u00efs ensilage et le ma\u00efs de p\u00e2turage, ainsi que sur les fourrages, afin d&rsquo;aider les \u00e9leveurs \u00e0 optimiser la sant\u00e9 de leurs animaux 365 jours par an. Consultez le guide des semences Maizex ou <a href=\"https:\/\/maizex.com\/fr\/alimentez-lexcellence-365\/\">maizex.com<\/a> pour plus d&rsquo;informations.<\/figcaption><\/figure>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>La saison de croissance 2025 a \u00e9t\u00e9 marqu\u00e9e par des conditions chaudes et particuli\u00e8rement s\u00e8ches, affectant de mani\u00e8re variable les r\u00e9gions agricoles du Qu\u00e9bec. En cons\u00e9quence, la r\u00e9colte de l\u2019ensilage&#8230;<\/p>\n","protected":false},"author":4,"featured_media":11820,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"inline_featured_image":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"categories":[63],"tags":[],"class_list":["post-12068","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agronomie"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ma\u00efs ensilage et s\u00e9cheresse 2025 - Maizex Seeds Inc.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/maizex.com\/fr\/mais-ensilage-et-secheresse-2025\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ma\u00efs ensilage et s\u00e9cheresse 2025 - Maizex Seeds Inc.\" \/>\n<meta property=\"og:description\" content=\"La saison de croissance 2025 a \u00e9t\u00e9 marqu\u00e9e par des conditions chaudes et particuli\u00e8rement s\u00e8ches, affectant de mani\u00e8re variable les r\u00e9gions agricoles du Qu\u00e9bec. 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