{"id":12899,"date":"2026-06-05T13:04:40","date_gmt":"2026-06-05T17:04:40","guid":{"rendered":"https:\/\/maizex.com\/?p=12899"},"modified":"2026-06-05T13:04:44","modified_gmt":"2026-06-05T17:04:44","slug":"conditions-de-semis-et-impacts-sur-lemergence","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/conditions-de-semis-et-impacts-sur-lemergence\/","title":{"rendered":"Conditions de semis et impacts sur l\u2019\u00e9mergence"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">L\u2019objectif principal au printemps est de r\u00e9aliser les semis au moment opportun. <strong>La gestion du risque fait donc partie int\u00e9grante des d\u00e9cisions agronomiques<\/strong>, et le semis constitue un levier cl\u00e9 \u00e0 \u00e9valuer avec rigueur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le semis h\u00e2tif comporte toutefois des risques importants, notamment en lien avec la temp\u00e9rature du sol. Lorsque celle-ci demeure inf\u00e9rieure \u00e0 la normale apr\u00e8s l\u2019implantation, la germination et l\u2019\u00e9mergence peuvent \u00eatre retard\u00e9es, parfois de plusieurs semaines. Cette ann\u00e9e, dans la r\u00e9gion de Saint-Hyacinthe, les temp\u00e9ratures nocturnes sont demeur\u00e9es sous les 10 \u00b0C entre le 27 avril et le 16 mai, \u00e0 l\u2019exception d\u2019une seule nuit, cr\u00e9ant des conditions peu favorables au d\u00e9marrage des cultures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans ces conditions, les semences ont absorb\u00e9 de l\u2019eau froide lors de leur r\u00e9hydratation, ce qui peut endommager les membranes cellulaires et entra\u00eener des d\u00e9sordres m\u00e9taboliques affectant la germination. Plusieurs situations ont \u00e9t\u00e9 observ\u00e9es : certains grains ont germ\u00e9 sans parvenir \u00e0 \u00e9merger, provoquant l\u2019ouverture des feuilles sous la surface du sol; d\u2019autres ont simplement initi\u00e9 une racine sans poursuivre leur d\u00e9veloppement; enfin, certains plants ont \u00e9merg\u00e9 partiellement avant de d\u00e9p\u00e9rir par manque d\u2019\u00e9nergie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les semences positionn\u00e9es avec le germe orient\u00e9 vers le fond du sillon se sont r\u00e9v\u00e9l\u00e9es particuli\u00e8rement vuln\u00e9rables. En conditions normales, cette orientation provoque un l\u00e9ger retard d\u2019\u00e9mergence d\u2019environ deux jours. Toutefois, en sol froid, ce d\u00e9lai peut s\u2019allonger et augmenter les risques d\u2019avortement ou d\u2019\u00e9puisement des r\u00e9serves \u00e9nerg\u00e9tiques avant l\u2019\u00e9mergence.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Par ailleurs, certaines conditions physiques du sol, comme la formation d\u2019une cro\u00fbte en surface ou un travail de sol intensif visant \u00e0 incorporer les r\u00e9sidus de culture, peuvent \u00e9galement nuire \u00e0 la qualit\u00e9 de l\u2019\u00e9mergence. Ces facteurs contribuent fr\u00e9quemment \u00e0 une lev\u00e9e in\u00e9gale, \u00e0 des manques sur le rang et, dans certains cas, \u00e0 une r\u00e9duction significative de la population.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En somme, lorsque la temp\u00e9rature du sol se maintient sous 10 \u00b0C pendant plusieurs jours apr\u00e8s le semis, la germination est ralentie et l\u2019\u00e9mergence retard\u00e9e. Ce d\u00e9lai accro\u00eet le risque d\u2019\u00e9puisement des r\u00e9serves de la semence avant qu\u2019elle n\u2019atteigne la surface, ce qui peut entra\u00eener des pertes de population importantes.<\/p>\n\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12899_1b2b14-b3 .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12899_1b2b14-b3 .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-12899_1b2b14-b3\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n\n\n<div class=\"wp-block-image is-style-default\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"624\" height=\"205\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/population-gaps_web.jpg\" alt=\"\" class=\"wp-image-12900\" style=\"width:624px;height:auto\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/population-gaps_web.jpg 624w, https:\/\/maizex.com\/wp-content\/uploads\/population-gaps_web-300x99.jpg 300w\" sizes=\"auto, (max-width: 624px) 100vw, 624px\" \/><figcaption class=\"wp-element-caption\">Manque au niveau de la population<\/figcaption><\/figure>\n<\/div>\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12899_68d8e7-4d .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12899_68d8e7-4d .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-12899_68d8e7-4d\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n\n\n<style>.kb-image12899_80ed4b-1c.kb-image-is-ratio-size, .kb-image12899_80ed4b-1c .kb-image-is-ratio-size{max-width:624px;width:100%;}.wp-block-kadence-column > .kt-inside-inner-col > .kb-image12899_80ed4b-1c.kb-image-is-ratio-size, .wp-block-kadence-column > .kt-inside-inner-col > .kb-image12899_80ed4b-1c .kb-image-is-ratio-size{align-self:unset;}.kb-image12899_80ed4b-1c figure{max-width:624px;}.kb-image12899_80ed4b-1c .image-is-svg, .kb-image12899_80ed4b-1c .image-is-svg img{width:100%;}.kb-image12899_80ed4b-1c .kb-image-has-overlay:after{opacity:0.3;}<\/style>\n<div class=\"wp-block-kadence-image kb-image12899_80ed4b-1c\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"476\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/IMG_1593_web-1.png\" alt=\"\" class=\"kb-img wp-image-12904\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/IMG_1593_web-1.png 800w, https:\/\/maizex.com\/wp-content\/uploads\/IMG_1593_web-1-300x179.png 300w, https:\/\/maizex.com\/wp-content\/uploads\/IMG_1593_web-1-768x457.png 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption>Plusieurs sc\u00e9narios de semences affect\u00e9s par l\u2019absorption d\u2019eau froide ce printemps au Qu\u00e9bec<\/figcaption><\/figure><\/div>\n\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12899_4c9ddf-ed .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12899_4c9ddf-ed .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-12899_4c9ddf-ed\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\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\"><div class=\"wp-block-image\">\n<figure class=\"alignright size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"400\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/IMG_1590_web-1.png\" alt=\"\" class=\"wp-image-12910\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/IMG_1590_web-1.png 300w, https:\/\/maizex.com\/wp-content\/uploads\/IMG_1590_web-1-225x300.png 225w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"400\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/IMG_1589_web-1.png\" alt=\"\" class=\"wp-image-12912\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/IMG_1589_web-1.png 300w, https:\/\/maizex.com\/wp-content\/uploads\/IMG_1589_web-1-225x300.png 225w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\" style=\"font-size:14px\">Semences positionn\u00e9es avec le germe orient\u00e9 vers le fond du sillon affect\u00e9 par l\u2019absorption d\u2019eau froide<\/p>\n\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12899_fdf734-79 .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12899_fdf734-79 .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-12899_fdf734-79\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Bas\u00e9 sur le tableau 3-17 de la publication agronomie 811 du guide agronomique de l\u2019OMAFRA, il est rarement rentable et efficace de resemer un champ de ma\u00efs.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1200\" height=\"874\" src=\"https:\/\/maizex.com\/wp-content\/uploads\/charte-de-rendement-en-fonction-du-peuplement-Firefly-Upscaler-2x-scale_web.png\" alt=\"\" class=\"wp-image-12914\" style=\"width:800px\" srcset=\"https:\/\/maizex.com\/wp-content\/uploads\/charte-de-rendement-en-fonction-du-peuplement-Firefly-Upscaler-2x-scale_web.png 1200w, https:\/\/maizex.com\/wp-content\/uploads\/charte-de-rendement-en-fonction-du-peuplement-Firefly-Upscaler-2x-scale_web-300x219.png 300w, https:\/\/maizex.com\/wp-content\/uploads\/charte-de-rendement-en-fonction-du-peuplement-Firefly-Upscaler-2x-scale_web-1024x746.png 1024w, https:\/\/maizex.com\/wp-content\/uploads\/charte-de-rendement-en-fonction-du-peuplement-Firefly-Upscaler-2x-scale_web-768x559.png 768w, https:\/\/maizex.com\/wp-content\/uploads\/charte-de-rendement-en-fonction-du-peuplement-Firefly-Upscaler-2x-scale_web-860x626.png 860w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/figure>\n<\/div>\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-12899_a406a8-dc .kt-block-spacer{height:60px;}.wp-block-kadence-spacer.kt-block-spacer-12899_a406a8-dc .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-12899_a406a8-dc\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Dans cette grille, un semis d\u00e9but mai avec une population lev\u00e9e de 22 500 plants\/acre \u00e0 un potentiel de 95 % du rendement optimum.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un resemis \u00e0 la fin mai avec une population lev\u00e9e de 30&nbsp;000 plants\/acre pr\u00e9sente un potentiel de rendement inf\u00e9rieur, soit 91 % du rendement optimum. &nbsp;Le seuil de resemis se situe \u00e0 environ 20 000 plants\/acre. Sans consid\u00e9ration des co\u00fbts d\u2019intervention.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Si l\u2019option de resemis est envisag\u00e9e, privil\u00e9gier l\u2019option de semis de soya \u00e0 la fin mai et d\u00e9but juin. Il sera plus facile de g\u00e9rer le d\u00e9sherbage du ma\u00efs existant.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Source&nbsp;:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.agry.purdue.edu\/ext\/corn\/news\/timeless\/CornReplant.html\">https:\/\/www.agry.purdue.edu\/ext\/corn\/news\/timeless\/CornReplant.html<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Guide agronomique des grandes cultures, Publication 811 2002.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/extension.entm.purdue.edu\/newsletters\/pestandcrop\/article\/cold-soils-and-risk-of-imbibitional-chilling-injury-in-corn\/\">https:\/\/extension.entm.purdue.edu\/newsletters\/pestandcrop\/article\/cold-soils-and-risk-of-imbibitional-chilling-injury-in-corn\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_____<\/p>\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","protected":false},"excerpt":{"rendered":"<p>L\u2019objectif principal au printemps est de r\u00e9aliser les semis au moment opportun. La gestion du risque fait donc partie int\u00e9grante des d\u00e9cisions agronomiques, et le semis constitue un levier cl\u00e9&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"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-12899","post","type-post","status-publish","format-standard","hentry","category-agronomie"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Conditions de semis et impacts sur l\u2019\u00e9mergence - 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\/conditions-de-semis-et-impacts-sur-lemergence\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Conditions de semis et impacts sur l\u2019\u00e9mergence - Maizex Seeds Inc.\" \/>\n<meta property=\"og:description\" content=\"L\u2019objectif principal au printemps est de r\u00e9aliser les semis au moment opportun. 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