{"id":1265,"date":"2023-07-25T17:10:00","date_gmt":"2023-07-25T15:10:00","guid":{"rendered":"https:\/\/www.elicit-plant.com\/?p=1265"},"modified":"2024-10-02T09:38:30","modified_gmt":"2024-10-02T07:38:30","slug":"anticiper-le-stress-hydrique-du-mais","status":"publish","type":"post","link":"https:\/\/www.elicit-plant.com\/fr\/blog\/stress-hydrique\/anticiper-le-stress-hydrique-du-mais\/","title":{"rendered":"Anticiper le stress hydrique du ma\u00efs"},"content":{"rendered":"<section class=\"cbo-text cbo-margin-container\">\n    <div class=\"\n        text-inner\n                cbo-container\n        container--small        \"\n    >\n        <div class=\"text-content cbo-cms cms--large\">\n            <p>Selon les pr\u00e9visions sur le r\u00e9chauffement climatique, les \u00e9pisodes de s\u00e9cheresse devraient s\u2019intensifier, exposant davantage le ma\u00efs au risque de\u00a0<a class=\"ek-link\" href=\"https:\/\/www.elicit-plant.com\/fr\/blog\/stress-hydrique\/\">stress hydrique<\/a>. Ce qui peut \u00eatre d\u2019autant plus probl\u00e9matique dans certaines situations d\u00e9j\u00e0 fragiles : sol \u00e0 faible r\u00e9serve utile, irrigation difficilement mise en place, voire impossible (conditions pratiques, restrictions r\u00e9glementaires\u2026), positionnement tardif des semis en raison de la date de r\u00e9colte de la culture pr\u00e9c\u00e9dente (prairie ou l\u00e9gumes)\u2026<\/p>\n<p>&nbsp;<\/p>\n<h2 class=\"wp-block-heading\">Reconna\u00eetre les sympt\u00f4mes du stress hydrique en cultures<\/h2>\n<p>En cas de s\u00e9cheresse pr\u00e9coce, sur des cultures de ma\u00efs au stade 6-7 feuilles, pour limiter le stress hydrique, la premi\u00e8re r\u00e9action des plantes est de fermer leurs stomates pour limiter les pertes d\u2019eau via l\u2019\u00e9vapotranspiration (ETP). En parall\u00e8le, la photosynth\u00e8se d\u00e9cline. Les feuilles du cornet s\u2019enroulent sur elles-m\u00eames et peuvent prendre une coloration bleue. La masse v\u00e9g\u00e9tative de la culture se r\u00e9duit, avec des impacts sur plusieurs composantes du rendement : nombre de rangs de l\u2019\u00e9pi, nombre de grains par rang, voire nombre moyen d\u2019\u00e9pis par plante et, dans les cas extr\u00eames, perte de pieds dans les parcelles.<\/p>\n<h2 class=\"wp-block-heading\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2422 aligncenter\" src=\"https:\/\/www.elicit-plant.com\/fr\/wp-content\/uploads\/sites\/1\/2023\/07\/image1.jpg\" alt=\"\" width=\"342\" height=\"457\" \/><\/h2>\n<p>&nbsp;<\/p>\n\n            <div style=\"clear: both;\"><\/div>\n        <\/div>\n    <\/div>\n<\/section>\n\n\n<section class=\"cbo-text cbo-margin-container\">\n    <div class=\"\n        text-inner\n                cbo-container\n        container--small        \"\n    >\n        <div class=\"text-content cbo-cms cms--large\">\n            <p>Avec un stress hydrique intervenant \u00e0 la floraison de la culture, la sortie des soies est retard\u00e9e (soit la floraison femelle) et on enregistre des probl\u00e8mes de f\u00e9condation. Apr\u00e8s ce stade, on peut observer une acc\u00e9l\u00e9ration de la s\u00e9nescence des feuilles du ma\u00efs, des \u00e9pis avec des grains avort\u00e9s et de l\u2019\u00e9chaudage sur les grains situ\u00e9s en haut de l\u2019\u00e9pi ou, parfois, sur un ou plusieurs rangs. Cons\u00e9quences : une baisse du nombre de grains par \u00e9pi et du PMG, donc un d\u00e9ficit du rendement des parcelles concern\u00e9es. Autres d\u00e9g\u00e2ts collat\u00e9raux possibles : une augmentation du d\u00e9veloppement de maladies en cultures (comme la fusariose des tiges) et de la sensibilit\u00e9 des tiges creuses.<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter  wp-image-2423\" src=\"https:\/\/www.elicit-plant.com\/fr\/wp-content\/uploads\/sites\/1\/2023\/07\/image2.jpg\" alt=\"\" width=\"423\" height=\"318\" \/> \u00a0<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter  wp-image-2424\" src=\"https:\/\/www.elicit-plant.com\/fr\/wp-content\/uploads\/sites\/1\/2023\/07\/image3.jpg\" alt=\"\" width=\"423\" height=\"318\" \/><\/p>\n<p>&nbsp;<\/p>\n\n            <div style=\"clear: both;\"><\/div>\n        <\/div>\n    <\/div>\n<\/section>\n\n\n<section class=\"cbo-text cbo-margin-container\">\n    <div class=\"\n        text-inner\n                cbo-container\n        container--small        \"\n    >\n        <div class=\"text-content cbo-cms cms--large\">\n            <p>Dans tous les cas, les rendements des parcelles sont en jeu.<\/p>\n<p>Que faire face \u00e0 un d\u00e9ficit d\u2019eau en cultures ?<br \/>\nEn cas de stress hydrique, une solution curative pour ceux qui le peuvent est d\u2019irriguer, selon les conditions de ressources en eau. Il est recommand\u00e9 de maintenir un rythme d\u2019apport d\u2019eau r\u00e9gulier aux cultures plut\u00f4t que de miser sur des doses importantes plus espac\u00e9es. \u00c0 noter que les tours d\u2019eau peuvent \u00eatre positionn\u00e9s entre le stade 10 feuilles et le stade 45 % d\u2019humidit\u00e9 du grain. Le pilotage va tenir compte du type de sol et de son \u00e9tat hydrique, des pr\u00e9visions m\u00e9t\u00e9o et du stade du ma\u00efs. Les outils d\u2019aide \u00e0 la d\u00e9cision et de pilotage de l\u2019irrigation peuvent \u00eatre tr\u00e8s utiles pour optimiser les apports.<\/p>\n<p>Il vaut mieux toutefois anticiper d\u00e8s les semis et sur tout l\u2019itin\u00e9raire technique, notamment en situations \u00e0 risques, pour s\u00e9curiser au maximum les rendements. Le choix des vari\u00e9t\u00e9s est crucial : privil\u00e9gier des vari\u00e9t\u00e9s avec une note \u00e9lev\u00e9e de tol\u00e9rance au stress hydrique, ainsi que les vari\u00e9t\u00e9s avec une pr\u00e9cocit\u00e9 \u00e0 la floraison et \u00e0 la r\u00e9colte, afin d\u2019\u00e9viter de faire co\u00efncider les stades sensibles avec les p\u00e9riodes de d\u00e9ficit d\u2019eau. Dans ce m\u00eame objectif d\u2019esquive, il faut semer les cultures le plus t\u00f4t possible. En cours de culture, il s\u2019agit d\u2019assurer la croissance et le d\u00e9veloppement des plantes dans des conditions optimales. Par exemple, un d\u00e9sherbage rigoureux permet d\u2019\u00e9viter la concurrence des adventices vis-\u00e0-vis de la ressource en eau.<\/p>\n<p>Autre levier incontournable : l\u2019application d\u2019une biosolution comme BEST-a par pulv\u00e9risation foliaire au stade 6-10 feuilles de la culture. Ce produit innovant se compose de phytost\u00e9rols naturels qui vont aider la plante \u00e0 anticiper le manque d\u2019eau. Comment ? Les phytost\u00e9rols permettent aux plantes de modifier leur physiologie en faveur d\u2019une meilleure adaptation \u00e0 la s\u00e9cheresse. Concr\u00e8tement, le principe actif de BEST-a provoque une fermeture partielle des stomates qui limite l\u2019\u00e9vapotranspiration, \u00e9conomisant ainsi entre 10 et 20 % d\u2019eau, sans impact sur le rendement et un accroissement du volume racinaire. En induisant ces r\u00e9actions en amont, les plantes se sont d\u00e9j\u00e0 adapt\u00e9es pour consommer moins d\u2019eau et \u00e9conomiser la ressource dans le sol. Cela leur permet de gagner des jours pr\u00e9cieux quand le d\u00e9ficit arrive, de limiter le nombre de jours de stress hydrique et de r\u00e9cup\u00e9rer plus rapidement lors d\u2019un nouvel apport d\u2019eau.<\/p>\n\n            <div style=\"clear: both;\"><\/div>\n        <\/div>\n    <\/div>\n<\/section>\n\n\n<section class=\"cbo-text cbo-margin-container\">\n    <div class=\"\n        text-inner\n                cbo-container\n        container--small        \"\n    >\n        <div class=\"text-content cbo-cms cms--large\">\n            <h2><strong>Int\u00e9ress\u00e9 par le Best-a ?<\/strong><\/h2>\n<div class=\"hs-cta-embed hs-cta-simple-placeholder hs-cta-embed-116449368823\" style=\"max-width: 100%; max-height: 100%; width: 350px; height: 435.40625px;\" data-hubspot-wrapper-cta-id=\"116449368823\"><a href=\"https:\/\/cta-eu1.hubspot.com\/web-interactives\/public\/v1\/track\/redirect?encryptedPayload=AVxigLIQ3T3H6ISih3xFgQd%2BBJnwcmc0WUNYpyRhFVK9Xnv9s%2BgE44yFBQ2e%2FJCPOrJYyrp4%2FTGeAtPEPkn%2FRczpOLNrqmAyXTg8Stkqucd3a25yzPd%2F4PVDM0G%2BKBq6zbATZWOLgrucmXfh2RHBk%2FWaoTPcWBrvutj7hAOwy0IpQoPmAlDYDr4av0AsDY5dlT6fHFrzyHGEZS9UW7HC43qUGKMRDLZF2%2Bh8x4PYX6RKuuJoqrUnQEfzZbHd4aX%2FovupSBCwng%3D%3D&amp;webInteractiveContentId=116449368823&amp;portalId=143801506\" target=\"_blank\" rel=\"noopener\"><br \/>\n<img decoding=\"async\" style=\"height: 100%; width: 100%; object-fit: fill;\" src=\"https:\/\/hubspot-no-cache-eu1-prod.s3.amazonaws.com\/cta\/default\/143801506\/interactive-116449368823.png\" alt=\"Best-a-EliZea-Bayer-1\" \/><br \/>\n<\/a><\/div>\n\n            <div style=\"clear: both;\"><\/div>\n        <\/div>\n    <\/div>\n<\/section>\n\n\n<section class=\"cbo-featuredlinks featuredlinks--colorwhite\">\n\t<div class=\"featuredlinks-inner cbo-container \">\n\n\t\t\t\t\t<h2 class=\"cbo-title-2 featuredlinks-title\">\n\t\t\t\tNos autres articles autour du stress hydrique\t\t\t<\/h2>\n\t\t\n\t\t<div class=\"featuredlinks-list\" data-anim-group data-group-delay=\"100\">\n\t\t\t\n\t\t\t<div class=\"list-el\">\n\t\t\t\t<a class=\"el-inner\" href=\"https:\/\/www.elicit-plant.com\/fr\/blog\/stress-hydrique\/best-a-pour-un-resultat-optimal-agissez-en-preventif\/\">\n\n\t\t\t\t\t<figure class=\"inner-picture cbo-picture-cover\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/elicit-plant-application-best-a-768x432.jpg\" srcset=\"https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/elicit-plant-application-best-a-320x180.jpg 320w, https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/elicit-plant-application-best-a-768x432.jpg 840w, https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/elicit-plant-application-best-a-768x432.jpg 1024w, https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/elicit-plant-application-best-a-768x432.jpg 1400w\" class=\"\" alt=\"Tracteur appliquant du Best-a sur champ de ma\u00efs\" width=\"768\" height=\"432\" sizes=\"auto, 100vw\" loading=\"lazy\" \/>\t\t\t\t\t<\/figure>\n\n\t\t\t\t\t<h3 class=\"inner-title cbo-title-3\">\n\t\t\t\t\t\tBEST-a: pour un r\u00e9sultat optimal, agissez en pr\u00e9ventif !\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<span class=\"inner-button cbo-buttonmore\">\n\t\t\t\t\t\t<i class=\"icon icon-cross\"><\/i>\n\t\t\t\t\t<\/span>\n\t\t\t\t<\/a>\n\t\t\t<\/div>\n\n\t\t\t\n\t\t\t<div class=\"list-el\">\n\t\t\t\t<a class=\"el-inner\" href=\"https:\/\/www.elicit-plant.com\/fr\/blog\/stress-hydrique\/les-biosolutions-preservent-la-marge-des-maisiculteurs-face-aux-aleas-du-climat\/\">\n\n\t\t\t\t\t<figure class=\"inner-picture cbo-picture-cover\">\n\t\t\t\t\t\t<img decoding=\"async\" src=\"https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/3c5b9c3e-c-les-biosolutions-preservent-la-marge-des-maisiculteurs-face-aux-aleas-du-climat-1000x562-1-1000x350-1-768x269.webp\" srcset=\"https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/3c5b9c3e-c-les-biosolutions-preservent-la-marge-des-maisiculteurs-face-aux-aleas-du-climat-1000x562-1-1000x350-1-320x112.webp 320w, https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/3c5b9c3e-c-les-biosolutions-preservent-la-marge-des-maisiculteurs-face-aux-aleas-du-climat-1000x562-1-1000x350-1-768x269.webp 840w, https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/3c5b9c3e-c-les-biosolutions-preservent-la-marge-des-maisiculteurs-face-aux-aleas-du-climat-1000x562-1-1000x350-1-768x269.webp 1024w, https:\/\/www.elicit-plant.com\/app\/uploads\/sites\/1\/2023\/07\/3c5b9c3e-c-les-biosolutions-preservent-la-marge-des-maisiculteurs-face-aux-aleas-du-climat-1000x562-1-1000x350-1-768x269.webp 1400w\" class=\"\" alt=\"Les biosolutions pr\u00e9servent la marge des ma\u00efsiculteurs face aux al\u00e9as du climat\" width=\"768\" height=\"269\" sizes=\"auto, 100vw\" loading=\"lazy\" \/>\t\t\t\t\t<\/figure>\n\n\t\t\t\t\t<h3 class=\"inner-title cbo-title-3\">\n\t\t\t\t\t\tLes biosolutions pr\u00e9servent la marge des ma\u00efsiculteurs face aux al\u00e9as du climat\t\t\t\t\t<\/h3>\n\n\t\t\t\t\t<span class=\"inner-button cbo-buttonmore\">\n\t\t\t\t\t\t<i class=\"icon icon-cross\"><\/i>\n\t\t\t\t\t<\/span>\n\t\t\t\t<\/a>\n\t\t\t<\/div>\n\n\t\t\t\t\t<\/div>\n\n\t<\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Le ma\u00efs est sensible au stress hydrique \u00e0 partir du stade 10 feuilles, avec un maximum autour de la floraison, 10 jours avant et 3 semaines apr\u00e8s environ. Un manque d\u2019eau entra\u00eene des sympt\u00f4mes qui diff\u00e8rent selon la p\u00e9riode \u00e0 laquelle il survient. Voici quelques mesures possibles pour y faire face.<\/p>\n","protected":false},"author":3,"featured_media":1267,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"class_list":["post-1265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stress-hydrique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Anticiper le stress hydrique du ma\u00efs - Elicit Plant France<\/title>\n<meta name=\"description\" content=\"Un manque d\u2019eau entra\u00eene des sympt\u00f4mes qui diff\u00e8rent selon la p\u00e9riode \u00e0 laquelle il survient. 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