{"id":27238,"date":"2025-06-03T18:56:31","date_gmt":"2025-06-03T18:56:31","guid":{"rendered":"https:\/\/prograin.ca\/ca\/?p=27238"},"modified":"2025-08-13T13:37:08","modified_gmt":"2025-08-13T13:37:08","slug":"les-stades-vegetatifs-du-soya","status":"publish","type":"post","link":"https:\/\/prograin.ca\/ca\/fr\/2025\/06\/03\/les-stades-vegetatifs-du-soya\/","title":{"rendered":"Les stades v\u00e9g\u00e9tatifs du soya"},"content":{"rendered":"\n<p>Les stades v\u00e9g\u00e9tatifs du soya d\u00e9butent \u00e0 la lev\u00e9e et se terminent lorsque les plants poss\u00e8dent de nombreuses feuilles trifoli\u00e9es. Le nombre de feuilles finales d\u00e9pend notamment de la vari\u00e9t\u00e9, mais aussi des conditions environnementales.<\/p>\n\n\n\n<p>Bonne lecture !<\/p>\n\n\n\n<h2>Les effets sur les feuilles aux premiers stades<\/h2>\n\n\n\n<p>Il arrive en d\u00e9but de saison que les feuilles du soya soient plus p\u00e2les que la normale. La raison est tout simplement qu\u2019elles ont \u00e9t\u00e9 expos\u00e9es \u00e0 un sol et \u00e0 des temp\u00e9ratures plus fra\u00eeches. Avec les jours de beau temps, les feuilles retrouvent habituellement leur couleur naturelle et il n\u2019y a pas de pertes de rendement. Si ce n\u2019est pas le cas, le soya souffre probablement de <a href=\"https:\/\/prograin.ca\/ca\/fr\/2020\/07\/22\/nutrient-deficiencies-in-soybeans\/\">carences en nutriments<\/a> ou de <a href=\"https:\/\/prograin.ca\/ca\/fr\/2023\/08\/03\/senescence-en-cours-de-saison-a-quelle-maladie-a-t-on-affaire\/\">maladies<\/a>.<\/p>\n\n\n\n<p>Les <a href=\"https:\/\/prograin.ca\/ca\/fr\/2020\/07\/22\/la-gestion-des-insectes-dans-la-culture-du-soya\/\">insectes<\/a> ont \u00e9galement la capacit\u00e9 de causer des dommages aux feuilles de soya, principalement \u00e0 celles du haut. Pour minimiser les pertes, les feuilles du bas ont la capacit\u00e9 d\u2019absorber davantage de lumi\u00e8re en produisant une photosynth\u00e8se accrue. Les plants pourront ainsi continuer leur d\u00e9veloppement jusqu\u2019\u00e0 maturation.<\/p>\n\n\n\n<p><strong>Quand intervenir ? <\/strong>Lorsque les feuilles du milieu du plant pr\u00e9sentent un taux de d\u00e9foliation sup\u00e9rieur \u00e0 30&nbsp;%.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Image2.jpg\" alt=\"\" class=\"wp-image-27245\" width=\"200\" height=\"539\" srcset=\"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Image2.jpg 296w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Image2-9x24.jpg 9w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Image2-13x36.jpg 13w, https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Image2-18x48.jpg 18w\" sizes=\"(max-width: 200px) 100vw, 200px\" \/><\/figure>\n\n\n\n<p class=\"has-small-font-size\">Source&nbsp;: Martin Rice (Universit\u00e9 de l\u2019Iowa) <\/p>\n\n\n\n<h2>Les stades v\u00e9g\u00e9tatifs<strong> <\/strong><\/h2>\n\n\n\n<p><strong>VE Lev\u00e9e <\/strong>(5 \u00e0 15 jours) <\/p>\n\n\n\n<ul><li>La sortie des cotyl\u00e9dons \u00e0 la surface du sol est influenc\u00e9e par la temp\u00e9rature, la profondeur et la date du semis.<\/li><\/ul>\n\n\n\n<p><strong>VC&nbsp;: Premi\u00e8res feuilles unifoli\u00e9es d\u00e9roul\u00e9es<\/strong> (3 \u00e0 10 jours)<\/p>\n\n\n\n<ul><li>Les deux premi\u00e8res feuilles sont unifoli\u00e9es et oppos\u00e9es sur la tige. Elles sont consid\u00e9r\u00e9es comme le premier n\u0153ud foliaire.<\/li><li>Les cotyl\u00e9dons sous les feuilles constituent la premi\u00e8re r\u00e9serve de nutriments et d\u2019\u00e9nergie avant que la photosynth\u00e8se ne commence. Les plants ne se r\u00e9tabliront donc pas s&#8217;ils sont endommag\u00e9s.<\/li><\/ul>\n\n\n\n<p><strong>V1&nbsp;: Premi\u00e8res feuilles trifoli\u00e9es d\u00e9roul\u00e9es <\/strong>(3 \u00e0 10 jours) <\/p>\n\n\n\n<ul><li>Le n\u0153ud de la deuxi\u00e8me feuille et tous les n\u0153uds \u00e0 suivre sont singuliers et s\u2019alternent sur la tige.<\/li><li>Des nodules racinaires fixateurs d\u2019azote commencent \u00e0 se former sur les racines.<\/li><li>Lors de cette \u00e9tape, il suffit d\u2019\u00e9valuer votre peuplement afin de d\u00e9terminer si une replantation est n\u00e9cessaire. <\/li><\/ul>\n\n\n\n<p><strong>V2&nbsp;: Deuxi\u00e8mes feuilles trifoli\u00e9es d\u00e9roul\u00e9es <\/strong>(3 \u00e0 10 jours) <\/p>\n\n\n\n<ul><li>Les racines lat\u00e9rales se d\u00e9veloppent rapidement aux premiers cm du sol. <\/li><\/ul>\n\n\n\n<p><strong>V3&nbsp;: Troisi\u00e8mes feuilles trifoli\u00e9es d\u00e9roul\u00e9es<\/strong> (3 \u00e0 10 jours)<\/p>\n\n\n\n<ul><li>Trois n\u0153uds sur la tige principale avec d\u00e9but des feuilles enti\u00e8rement d\u00e9velopp\u00e9es avec les n\u0153uds unifoli\u00e9s. <\/li><li>La fixation de l\u2019azote a d\u00e9but\u00e9.<\/li><\/ul>\n\n\n\n<p><strong>V4&nbsp;&amp; V5: Quatri\u00e8mes et cinqui\u00e8mes feuilles trifoli\u00e9es d\u00e9roul\u00e9es <\/strong>(3 \u00e0 8 jours)<\/p>\n\n\n\n<ul><li>Quatre ou cinq n\u0153uds sur la tige principale avec d\u00e9but des feuilles enti\u00e8rement d\u00e9velopp\u00e9es avec les n\u0153uds unifoli\u00e9s. <\/li><li>Les boutons floraux commencent \u00e0 se d\u00e9velopper du stade V4 au stade V6.<\/li><li>Les plants peuvent se remettre d\u2019une d\u00e9foliation \u00e0 100&nbsp;% \u00e0 ce stade avec un risque minimal de pertes de rendement.&nbsp;<\/li><\/ul>\n\n\n\n<h2>Mythes et r\u00e9alit\u00e9s <\/h2>\n\n\n\n<p><strong>Les plants doivent \u00e9merger de fa\u00e7on uniforme pour maximiser le rendement. <\/strong><\/p>\n\n\n\n<ul><li>Faux &#8211; m\u00eame si les grains n\u2019\u00e9mergent pas tous au m\u00eame moment, il n\u2019y a aucun impact sur le rendement.<\/li><\/ul>\n\n\n\n<p><strong>Le stress que le soya peut subir en d\u00e9but de saison a un impact b\u00e9n\u00e9fique sur le rendement. <\/strong><\/p>\n\n\n\n<ul><li>Faux &#8211; il n\u2019y a pas d\u2019am\u00e9lioration de rendement lorsque le soya subit du stress en d\u00e9but de saison.<\/li><\/ul>\n\n\n\n<p><strong>La fertilisation d\u2019azote contribue \u00e0 optimiser le rendement dans les champs qui ont un haut potentiel de rendement.&nbsp;<\/strong><\/p>\n\n\n\n<ul><li>Faux &#8211; dans les zones \u00e0 haut potentiel de rendement, l\u2019ajout d\u2019azote ne contribue pas \u00e0 maximiser le rendement.<\/li><\/ul>\n\n\n\n<p>Pour plus d\u2019information sur le sujet, n\u2019h\u00e9sitez pas \u00e0 contacter votre repr\u00e9sentant Prograin ! &nbsp;<\/p>\n\n\n\n<p class=\"has-small-font-size\"><strong>Sources&nbsp;:<\/strong><\/p>\n\n\n\n<p class=\"has-small-font-size\">R\u00e9seau d\u2019avertissements phytosanitaires&nbsp;<em>: Bulletin d\u2019information&nbsp;: grandes cultures. (2016). D\u00e9foliation du soya par divers ravageurs&nbsp;: M\u00e9lo\u00e9 cendr\u00e9, criquets, scarab\u00e9e japonais, altises, limaces, etc<\/em>. <a href=\"https:\/\/www.agrireseau.net\/documents\/Document_92899.pdf\">https:\/\/www.agrireseau.net\/documents\/Document_92899.pdf<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size\">Manni Singh. (2022). <em>Science for Success: Misconceptions on Vegetative Stages of Soybean Growth<\/em>. YouTube. <a href=\"https:\/\/www.youtube.com\/watch?v=_2aBnTLoZKQ\">https:\/\/www.youtube.com\/watch?v=_2aBnTLoZKQ<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size\">Minist\u00e8re de l\u2019Agriculture, de l\u2019Alimentation et des Affaires rurales. (2017). <em>Guide agronomique des grandes cultures. <\/em><a href=\"https:\/\/www.ontario.ca\/files\/2022-10\/omafra-agronomy-guide-for-field-crops-chapter-2-fr-2022-10-13.pdf\">https:\/\/www.ontario.ca\/files\/2022-10\/omafra-agronomy-guide-for-field-crops-chapter-2-fr-2022-10-13.pdf<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size\">Seth L. Naeve. University of Minnesota. (2018). <a href=\"https:\/\/extension.umn.edu\/growing-soybean\/soybean-growth-stages\">https:\/\/extension.umn.edu\/growing-soybean\/soybean-growth-stages<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size\">Shaun Castel &amp; al. (2022). <em>The soybean growth cycle: Important risks, management and misconceptions.<\/em> <a href=\"https:\/\/soybeanresearchinfo.com\/wp-content\/uploads\/2022\/01\/Science-for-Success-Soybean-Growth-Stages-V3.pdf\">https:\/\/soybeanresearchinfo.com\/wp-content\/uploads\/2022\/01\/Science-for-Success-Soybean-Growth-Stages-V3.pdf<\/a><\/p>\n\n\n\n<p class=\"has-small-font-size\">Cool Bean &#8211; University of Wisconsin-Madison. (2017). <em>A visual Guide to Soybean Growth Stage<\/em>. <a href=\"https:\/\/coolbean.info\/library\/documents\/2017_Soybean_GrowthDev_Guide_FINAL.pdf\">https:\/\/coolbean.info\/library\/documents\/2017_Soybean_GrowthDev_Guide_FINAL.pdf<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les stades v\u00e9g\u00e9tatifs du soya d\u00e9butent \u00e0 la lev\u00e9e et se terminent lorsque les plants poss\u00e8dent de nombreuses feuilles trifoli\u00e9es. Le nombre de feuilles finales d\u00e9pend notamment de la vari\u00e9t\u00e9, mais aussi des conditions environnementales. Bonne lecture ! Les effets sur les feuilles aux premiers stades Il arrive en d\u00e9but de saison que les feuilles [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":27241,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":""},"categories":[272],"tags":[],"author_meta":{"display_name":"anouk","author_link":"https:\/\/prograin.ca\/ca\/author\/anouk\/"},"featured_img":"https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-300x200.jpg","yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.11 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Les stades v\u00e9g\u00e9tatifs du soya - Prograin - Canada<\/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:\/\/prograin.ca\/ca\/fr\/2025\/06\/03\/les-stades-vegetatifs-du-soya\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les stades v\u00e9g\u00e9tatifs du soya - Prograin - Canada\" \/>\n<meta property=\"og:description\" content=\"Les stades v\u00e9g\u00e9tatifs du soya d\u00e9butent \u00e0 la lev\u00e9e et se terminent lorsque les plants poss\u00e8dent de nombreuses feuilles trifoli\u00e9es. Le nombre de feuilles finales d\u00e9pend notamment de la vari\u00e9t\u00e9, mais aussi des conditions environnementales. Bonne lecture ! 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Le nombre de feuilles finales d\u00e9pend notamment de la vari\u00e9t\u00e9, mais aussi des conditions environnementales. Bonne lecture ! Les effets sur les feuilles aux premiers stades Il arrive en d\u00e9but de saison que les feuilles du soya soient plus p\u00e2les que la normale. La raison est tout simplement qu\u2019elles ont \u00e9t\u00e9 expos\u00e9es \u00e0 un sol et \u00e0 des temp\u00e9ratures plus fra\u00eeches. Avec les jours de beau temps, les feuilles retrouvent habituellement leur couleur naturelle et il n\u2019y a pas de&hellip;<\/p>\n","category_list":"<a href=\"https:\/\/prograin.ca\/ca\/fr\/category\/non-classe-fr\/\" rel=\"category tag\">Non class\u00e9<\/a>","author_info":{"name":"anouk","url":"https:\/\/prograin.ca\/ca\/author\/anouk\/"},"comments_num":"0 comments","featured_image_urls_v2":{"full":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre.jpg",2048,1365,false],"thumbnail":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-150x150.jpg",150,150,true],"medium":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-300x200.jpg",300,200,true],"medium_large":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-768x512.jpg",768,512,true],"large":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-2000x1333.jpg",2000,1333,true],"1536x1536":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-1536x1024.jpg",1536,1024,true],"2048x2048":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre.jpg",2048,1365,false],"menu-24x24":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-24x16.jpg",24,16,true],"menu-36x36":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-36x24.jpg",36,24,true],"menu-48x48":["https:\/\/prograin.ca\/app\/uploads\/sites\/3\/2025\/03\/Creation-sans-titre-48x32.jpg",48,32,true]},"post_excerpt_stackable_v2":"<p>Les stades v\u00e9g\u00e9tatifs du soya d\u00e9butent \u00e0 la lev\u00e9e et se terminent lorsque les plants poss\u00e8dent de nombreuses feuilles trifoli\u00e9es. Le nombre de feuilles finales d\u00e9pend notamment de la vari\u00e9t\u00e9, mais aussi des conditions environnementales. Bonne lecture ! Les effets sur les feuilles aux premiers stades Il arrive en d\u00e9but de saison que les feuilles du soya soient plus p\u00e2les que la normale. La raison est tout simplement qu\u2019elles ont \u00e9t\u00e9 expos\u00e9es \u00e0 un sol et \u00e0 des temp\u00e9ratures plus fra\u00eeches. Avec les jours de beau temps, les feuilles retrouvent habituellement leur couleur naturelle et il n\u2019y a pas de&hellip;<\/p>\n","category_list_v2":"<a href=\"https:\/\/prograin.ca\/ca\/fr\/category\/non-classe-fr\/\" rel=\"category tag\">Non class\u00e9<\/a>","author_info_v2":{"name":"anouk","url":"https:\/\/prograin.ca\/ca\/author\/anouk\/"},"comments_num_v2":"0 comments","coauthors":[],"tax_additional":{"categories":{"linked":["<a href=\"https:\/\/prograin.ca\/ca\/fr\/category\/non-classe-fr\/\" class=\"advgb-post-tax-term\">Non class\u00e9<\/a>"],"unlinked":["<span class=\"advgb-post-tax-term\">Non class\u00e9<\/span>"]}},"comment_count":"0","relative_dates":{"created":"Posted 10 mois ago","modified":"Updated 8 mois ago"},"absolute_dates":{"created":"Posted on 3 juin 2025","modified":"Updated on 13 ao\u00fbt 2025"},"absolute_dates_time":{"created":"Posted on 3 juin 2025 18 h 56 min","modified":"Updated on 13 ao\u00fbt 2025 13 h 37 min"},"featured_img_caption":"","series_order":"","_links":{"self":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts\/27238"}],"collection":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/users\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/comments?post=27238"}],"version-history":[{"count":68,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts\/27238\/revisions"}],"predecessor-version":[{"id":27665,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/posts\/27238\/revisions\/27665"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/media\/27241"}],"wp:attachment":[{"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/media?parent=27238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/categories?post=27238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prograin.ca\/ca\/wp-json\/wp\/v2\/tags?post=27238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}