{"id":6393,"date":"2021-12-31T16:30:56","date_gmt":"2021-12-31T15:30:56","guid":{"rendered":"https:\/\/horti-generation.com\/stimulating-foliar-transpiration-preventing-tip-burn\/"},"modified":"2022-02-28T23:56:33","modified_gmt":"2022-02-28T22:56:33","slug":"stimuler-la-transpiration-foliaire-prevenir-les-brulures-marginales","status":"publish","type":"post","link":"https:\/\/horti-generation.com\/fr\/stimuler-la-transpiration-foliaire-prevenir-les-brulures-marginales\/","title":{"rendered":"R\u00f4le du calcium dans la pr\u00e9vention des br\u00fblures marginales sur les cultures de laitue et de tomate"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<h2><strong>Vocabulaire<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<ul><li>Le<strong> calcium (Ca) <\/strong>est un \u00e9l\u00e9ment essentiel des parois cellulaires. C&#8217;est un \u00e9l\u00e9ment important pour emp\u00eacher le d\u00e9veloppement d&#8217;agents pathog\u00e8nes dans les cellules v\u00e9g\u00e9tales. En fait, les <strong>carences en calcium<\/strong> peuvent provoquer la chute pr\u00e9matur\u00e9e des fleurs et des bourgeons. Elle provoque \u00e9galement des br\u00fblures \u00e0 l&#8217;extr\u00e9mit\u00e9 de certaines plantes.<\/li><\/ul>\n\n\n\n<p><\/p>\n\n\n\n<ul><li>La <strong>br\u00fblure marginale \/ apicale <\/strong>ou <em>tip-burn<\/em> en anglais est un probl\u00e8me nutritionnel qui affecte surtout les cultures de laitue. Le br\u00fblure marginale est une <strong>n\u00e9crose terminale des feuilles<\/strong> due \u00e0 une carence en calcium. C&#8217;est \u00e9galement une maladie courante qui affecte les cultures de tomates.<\/li><\/ul>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"is-layout-flex wp-block-gallery-1 wp-block-gallery aligncenter columns-2 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"683\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-1024x683.jpg\" alt=\"\" data-id=\"6340\" data-link=\"https:\/\/horti-generation.com\/role-of-calcium-in-preventing-tip-burn\/petra-cigale-cltxwyh4sys-unsplash-1\/\" class=\"wp-image-6341\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-1024x683.jpg 1024w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-300x200.jpg 300w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-768x512.jpg 768w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-1536x1024.jpg 1536w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-2048x1365.jpg 2048w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-730x487.jpg 730w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/petra-cigale-CLtxWYH4sYs-unsplash-1-1070x713.jpg 1070w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"685\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-1024x685.jpg\" alt=\"\" data-id=\"6380\" data-full-url=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash.jpg\" data-link=\"https:\/\/horti-generation.com\/role-of-calcium-in-preventing-tip-burn-disease-tomato-lettuce-crops\/dani-california-gcwzsrrdsle-unsplash\/\" class=\"wp-image-6381\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-1024x685.jpg 1024w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-300x201.jpg 300w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-768x514.jpg 768w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-1536x1028.jpg 1536w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-2048x1371.jpg 2048w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-730x489.jpg 730w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/dani-california-gCwZSrrdSLE-unsplash-1070x716.jpg 1070w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\"><em>La laitue et la tomate sont deux cultures touch\u00e9es par les br\u00fblures marginales<\/em><\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2><strong>Circulation du calcium dans les plantes<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>En effet, le <strong>calcium circule<\/strong> \u00e0 l&#8217;int\u00e9rieur de la plante par les vaisseaux du xyl\u00e8me (voir image ci-dessous). Des racines aux feuilles, le <strong>calcium suit<\/strong> le flux d&#8217;eau utilis\u00e9 pour la <strong>transpiration<\/strong>. Lorsque les feuilles du haut de la plante ne transpirent pas assez, elles ne re\u00e7oivent pas assez de calcium. Cela cr\u00e9e une carence qui affaiblit la plante.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/c\/c0\/Transpiration_Overview.svg\/512px-Transpiration_Overview.svg.png\" alt=\"File:Transpiration Overview.svg\"\/><\/figure><\/div>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h4><strong>L\u00e9gendes ci-dessous :<\/strong><\/h4>\n\n\n\n<p><\/p>\n\n\n\n<p>1 = Les mol\u00e9cules d&#8217;eau sont captur\u00e9es passivement par les racines et entrent dans les tissues du xyl\u00e8me.<\/p>\n\n\n\n<p>2 = Colonne d&#8217;eau permettant aux mol\u00e9cules d&#8217;adh\u00e9rer et de circuler des racines au sommet de la plante <\/p>\n\n\n\n<p>3 = Contact avec les stomates (pores), lorsque les mol\u00e9cules d&#8217;eau s&#8217;\u00e9vaporent, cela cr\u00e9e une tension (force de traction) dans la colonne d&#8217;eau.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2><strong>Stimuler la transpiration foliaire<\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>Le probl\u00e8me des br\u00fblures de pointe est directement li\u00e9 \u00e0 un <strong>manque de transpiration foliaire<\/strong>. En effet, le <em>tip-burn<\/em> se produit sur le haut de la plante sur les jeunes feuilles mais il ne devient visible que sur les feuilles matures.<\/p>\n\n\n\n<p>Cette anomalie est directement li\u00e9e \u00e0 un<strong> climat dans la serre<\/strong> potentiellement &#8220;trop humide&#8221;. Elle peut \u00eatre li\u00e9e aux points de consigne (<em>set-points<\/em>) dans la gestion climatique ou \u00e0 un manque de ventilation dans la zone de culture.<\/p>\n\n\n\n<p>Dans le <strong>cas de la laitue<\/strong>, le fait de diriger le flux d&#8217;air vers le c\u0153ur de la plante permet de limiter l&#8217;accumulation d&#8217;humidit\u00e9 dans ces zones \u00e0 croissance rapide. Certains producteurs utilisent donc des <strong>ventilateurs \u00e0 flux vertical<\/strong> (VAF) pour la culture hydroponique de la laitue en serre.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"is-layout-flex wp-block-gallery-3 wp-block-gallery aligncenter columns-3 is-cropped\"><ul class=\"blocks-gallery-grid\"><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"681\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-1024x681.jpg\" alt=\"\" data-id=\"6359\" data-full-url=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517.jpg\" data-link=\"https:\/\/horti-generation.com\/role-of-calcium-in-preventing-tip-burn\/p1150517\/\" class=\"wp-image-6360\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-1024x681.jpg 1024w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-300x199.jpg 300w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-768x511.jpg 768w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-1536x1021.jpg 1536w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-2048x1362.jpg 2048w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-730x485.jpg 730w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150517-1070x712.jpg 1070w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"768\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-1024x768.jpg\" alt=\"\" data-id=\"6362\" data-full-url=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519.jpg\" data-link=\"https:\/\/horti-generation.com\/role-of-calcium-in-preventing-tip-burn\/p1150519\/\" class=\"wp-image-6363\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-1024x768.jpg 1024w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-300x225.jpg 300w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-768x576.jpg 768w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-1536x1152.jpg 1536w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-2048x1536.jpg 2048w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-356x267.jpg 356w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-730x548.jpg 730w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150519-1070x803.jpg 1070w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><li class=\"blocks-gallery-item\"><figure><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"657\" src=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-1024x657.jpg\" alt=\"\" data-id=\"6365\" data-full-url=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521.jpg\" data-link=\"https:\/\/horti-generation.com\/role-of-calcium-in-preventing-tip-burn\/p1150521\/\" class=\"wp-image-6366\" srcset=\"https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-1024x657.jpg 1024w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-300x192.jpg 300w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-768x493.jpg 768w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-1536x985.jpg 1536w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-2048x1314.jpg 2048w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-730x468.jpg 730w, https:\/\/horti-generation.com\/wp-content\/uploads\/2021\/12\/P1150521-1070x686.jpg 1070w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><\/li><\/ul><figcaption class=\"blocks-gallery-caption\"><em>Vertical air flow (VAF) combined with a pad and fans cooling for NFT lettuce  in the USA<\/em><\/figcaption><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2><strong>Conclusion <\/strong><\/h2>\n\n\n\n<p><\/p>\n\n\n\n<p>La transpiration foliaire est directement li\u00e9e \u00e0 l&#8217;<strong>activit\u00e9 photosynth\u00e9tique<\/strong> de la plante. Une transpiration foliaire insuffisante peut entra\u00eener des <strong>carences<\/strong> en calcium.<\/p>\n\n\n\n<p>Pour ces raisons, il est important de pr\u00eater attention aux <strong>param\u00e8tres climatiques <\/strong>de la serre. L&#8217;ajout de ventilateurs de circulation (HAF ou VAF) est n\u00e9cessaire pour homog\u00e9n\u00e9iser l&#8217;air dans la serre et limiter l&#8217;accumulation d&#8217;humidit\u00e9 dans certaines zones.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Sources:<\/p>\n\n\n\n<p>Br\u00fblure de la pointe en laitue (BEJO):<br><a href=\"https:\/\/www.bejo.fr\/magazine\/brulure-de-la-pointe-en-laitue\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.bejo.fr\/magazine\/brulure-de-la-pointe-en-laitue<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Prevent Tipburn On Greenhouse Lettuce (Urban Ag News):<br><a href=\"https:\/\/urbanagnews.com\/blog\/prevent-tipburn-on-greenhouse-lettuce\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/urbanagnews.com\/blog\/prevent-tipburn-on-greenhouse-lettuce\/<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Production de la tomate de serre au Qu\u00e9bec:<br><a href=\"https:\/\/www.agrireseau.net\/documents\/95590\/production-de-la-tomate-de-serre-au-quebec-guide-technique-de-297-pages\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/www.agrireseau.net\/documents\/95590\/production-de-la-tomate-de-serre-au-quebec-guide-technique-de-297-pages<\/a><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Jones J. J., Zitter T. A., Momol T. M. &amp; Miller S. A. (Eds) (2014). Blossom-End Rot. Dans&nbsp;<em>Compendium of Tomato Diseases and Pests<\/em>. 2e \u00e9d. APS Press. The American Phytopathological Society Press, St-Paul, Minnesota. p. 129.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les carences en calcium peuvent entra\u00eener une chute pr\u00e9matur\u00e9e des fleurs et des bourgeons. Elle provoque \u00e9galement des br\u00fblures \u00e0 l&#8217;extr\u00e9mit\u00e9 de certaines plantes. [&#8230;] Lorsque les feuilles situ\u00e9es au sommet d&#8217;une plante ne transpirent pas assez, elles ne re\u00e7oivent pas assez de calcium. Cela cr\u00e9e une carence qui affaiblit la plante.<\/p>\n","protected":false},"author":2,"featured_media":6386,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[251,263,267],"tags":[855,845,828,716,852,846,847,853,849,284,850,854,851],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>R\u00f4le du calcium dans la pr\u00e9vention des br\u00fblures marginales sur les cultures de laitue et de tomate - Horti Generation<\/title>\n<meta name=\"description\" content=\"Des racines aux feuilles, le calcium suit le flux d&#039;eau utilis\u00e9 pour la transpiration. 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