{"id":15529,"date":"2026-07-02T18:16:37","date_gmt":"2026-07-02T16:16:37","guid":{"rendered":"https:\/\/ragt-seeds.com\/fr\/?p=15529"},"modified":"2026-07-02T18:37:10","modified_gmt":"2026-07-02T16:37:10","slug":"tournesol-2026-comment-gerer-le-double-stress-thermique-et-hydrique-avant-la-floraison","status":"publish","type":"post","link":"https:\/\/ragt-seeds.com\/fr\/tournesol-2026-comment-gerer-le-double-stress-thermique-et-hydrique-avant-la-floraison\/","title":{"rendered":"Stress hydrique et thermique du tournesol : faire le point \u00e0 l&rsquo;approche de la floraison"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"15529\" class=\"elementor elementor-15529\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6764197 e-con-full e-flex e-con e-child\" data-id=\"6764197\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-09946ca elementor-widget elementor-widget-text-editor\" data-id=\"09946ca\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Sem\u00e9s dans le courant du mois d&rsquo;avril, les tournesols font face cette ann\u00e9e \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es qui accentuent le manque d&rsquo;eau dans les parcelles. Ce contexte climatique p\u00e8se directement sur le potentiel de rendement, en particulier dans les parcelles \u00e0 faible R\u00e9serve Utile (RU) ou n&rsquo;ayant b\u00e9n\u00e9fici\u00e9 que de faibles pr\u00e9cipitations. Analyse de la situation et des leviers disponibles alors que la floraison d\u00e9bute dans beaucoup de r\u00e9gions.<\/p><h2>Au sommaire de cet article :<\/h2><ul><li data-path-to-node=\"7\"><a href=\"#secheresse\"><strong>1.<\/strong> <span data-olk-copy-source=\"MessageBody\"><strong>Face \u00e0 la s\u00e9cheresse<\/strong>, le tournesol active ses boucliers physiologiques<\/span><\/a><\/li><li data-path-to-node=\"7\"><p data-path-to-node=\"13\"><a href=\"#biomasse\"><strong>2<\/strong>.<strong>\u00a0Biomasse et indice foliaire :<\/strong> des situations h\u00e9t\u00e9rog\u00e8nes sur le terrain<\/a><\/p><\/li><li data-path-to-node=\"7\"><strong>3. Bilan Terres Inovia :<\/strong> une couverture des besoins en eau tr\u00e8s contrast\u00e9e<\/li><li data-path-to-node=\"7\"><p><a href=\"#Grille\"><strong>4. Grille d&rsquo;impact du stress hydrique<\/strong> sur le rendement du tournesol (en %)<\/a><\/p><\/li><li data-path-to-node=\"7\"><a href=\"#d\u00e9clencher_irrigation\"><strong>5. D\u00e9clencher l&rsquo;irrigation :<\/strong> valoriser chaque millim\u00e8tre disponible<\/a><\/li><li data-path-to-node=\"7\"><p><strong>6. Risque de canicule pendant la floraison<\/strong> <strong>:<\/strong> vigilance sur la fertilit\u00e9 des fleurs<\/p><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-97fa5d4 elementor-widget elementor-widget-image\" data-id=\"97fa5d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t<figure class=\"wp-caption\">\n\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"558\" src=\"https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2026\/07\/tournesol-sous-le-soleil-e1783007313849-1024x558.png\" class=\"attachment-large size-large wp-image-15531\" alt=\"tournesol stress soleil de plomb\" srcset=\"https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2026\/07\/tournesol-sous-le-soleil-e1783007313849-1024x558.png 1024w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2026\/07\/tournesol-sous-le-soleil-e1783007313849-300x163.png 300w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2026\/07\/tournesol-sous-le-soleil-e1783007313849-768x418.png 768w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2026\/07\/tournesol-sous-le-soleil-e1783007313849-600x327.png 600w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2026\/07\/tournesol-sous-le-soleil-e1783007313849.png 1263w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t<figcaption class=\"widget-image-caption wp-caption-text\"><\/figcaption>\n\t\t\t\t\t\t\t\t\t\t<\/figure>\n\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-050d92b elementor-widget elementor-widget-text-editor\" data-id=\"050d92b\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"secheresse\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2 data-path-to-node=\"7\">1. <span data-olk-copy-source=\"MessageBody\">Face \u00e0 la s\u00e9cheresse, le tournesol active ses boucliers physiologiques<\/span><\/h2><p data-path-to-node=\"9\"><span data-olk-copy-source=\"MessageBody\">Contrairement \u00e0 d&rsquo;autres cultures de printemps, le tournesol poss\u00e8de une excellente capacit\u00e9 de r\u00e9silience face au manque d&rsquo;eau, m\u00eame si cela se traduit par un ajustement de son potentiel de production. Lorsque le stress hydrique s&rsquo;installe d\u00e8s le stade bouton floral, la plante met en route plusieurs m\u00e9canismes d\u2019adaptation :<\/span><\/p><ul><li style=\"font-size: inherit; line-height: 1.15; color: inherit; direction: ltr;\" role=\"presentation\"><b data-olk-copy-source=\"MessageBody\">R\u00e9duction du volume de transpiration :<\/b> La plante limite sa consommation d\u2019eau globale.<\/li><li role=\"presentation\"><b data-olk-copy-source=\"MessageBody\">Optimisation de l&rsquo;efficience de l&rsquo;eau :<\/b>\u00a0L&rsquo;activit\u00e9 de photosynth\u00e8se diminue moins vite que la transpiration r\u00e9elle.<\/li><li role=\"presentation\"><b data-olk-copy-source=\"MessageBody\">Routage des nutriments :<\/b>\u00a0Les assimilats et produits m\u00e9tabolis\u00e9s sont orient\u00e9s en priorit\u00e9 vers le capitule, optimisant ainsi l\u2019indice de r\u00e9colte.<\/li><\/ul><blockquote data-path-to-node=\"11\"><p data-path-to-node=\"11,0\"><b data-path-to-node=\"11,0\" data-index-in-node=\"0\">Le point positif :<\/b> <span data-olk-copy-source=\"MessageBody\">Ces cultures soumises \u00e0 des contraintes pr\u00e9coces se trouvent paradoxalement \u00ab\u00a0endurcies\u00a0\u00bb et mieux pr\u00e9par\u00e9es \u00e0 affronter un manque d&rsquo;eau durant la floraison, qui reste la phase de sensibilit\u00e9 maximale.<\/span><\/p><\/blockquote>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e901f74 e-con-full e-flex e-con e-child\" data-id=\"e901f74\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f68c0c9 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"f68c0c9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1772\" height=\"1181\" src=\"https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol.webp\" class=\"attachment-full size-full wp-image-12624\" alt=\"\" srcset=\"https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol.webp 1772w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol-300x200.webp 300w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol-1024x682.webp 1024w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol-768x512.webp 768w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol-1536x1024.webp 1536w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2025\/03\/rgt_wilkinson_tournesol-600x400.webp 600w\" sizes=\"(max-width: 1772px) 100vw, 1772px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-07b7b03 e-con-full e-flex e-con e-child\" data-id=\"07b7b03\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t<div data-dce-title-color=\"#F9FBFC\" class=\"elementor-element elementor-element-8654a2e elementor-widget elementor-widget-heading\" data-id=\"8654a2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Choisir la bonne vari\u00e9t\u00e9 DE tournesol selon ses OBJECTIFS ? <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-18a4273 elementor-widget elementor-widget-heading\" data-id=\"18a4273\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">une strat\u00e9gie essentielle<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-98f6fa3 elementor-widget elementor-widget-button\" data-id=\"98f6fa3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/ragt-seeds.com\/fr\/tournesol\/\" target=\"_blank\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Choisir la bonne vari\u00e9t\u00e9<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5123ff7 elementor-widget elementor-widget-text-editor\" data-id=\"5123ff7\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"biomasse\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2 data-path-to-node=\"13\">2. <b data-olk-copy-source=\"MessageBody\">Biomasse et indice foliaire : des situations h\u00e9t\u00e9rog\u00e8nes sur le terrain<\/b><\/h2><div>\u00a0<\/div><div data-olk-copy-source=\"MessageBody\">Malgr\u00e9 cette r\u00e9silience, le d\u00e9veloppement v\u00e9g\u00e9tatif \u00e0 la veille de la floraison montre de fortes disparit\u00e9s selon les secteurs. Si de nombreuses parcelles pr\u00e9sentent un d\u00e9veloppement correct et r\u00e9gulier, le manque de pluie a s\u00e9v\u00e8rement limit\u00e9 la surface foliaire dans d&rsquo;autres situations.<\/div><div>Cette faible biomasse p\u00e9nalise directement la capacit\u00e9 photosynth\u00e9tique du tournesol. En termes de diagnostic agronomique, on consid\u00e8re que le potentiel de rendement commence \u00e0 \u00eatre impact\u00e9 d\u00e8s lors que\u00a0<b>l\u2019indice foliaire au stade E2<\/b>\u00a0(lorsque le bouton floral se d\u00e9tache des feuilles terminales)\u00a0<b>descend en dessous de 1,7<\/b>.<\/div><div>\u00a0<\/div><div><h2 data-path-to-node=\"23\">3. <span data-olk-copy-source=\"MessageBody\">Bilan Terres Inovia : une couverture des besoins en eau tr\u00e8s contrast\u00e9e<\/span><\/h2><div data-olk-copy-source=\"MessageBody\">En mod\u00e9lisant le rapport entre l&rsquo;\u00c9vapotranspiration R\u00e9elle et Maximale (ETR\/ETM) du 20 avril au 20 juin 2026, Terres Inovia met en \u00e9vidence de fortes disparit\u00e9s selon le type de sol (r\u00e9serves utiles de 50, 100 et 150 mm).<\/div><div>Les simulations confirment la s\u00e9v\u00e9rit\u00e9 du stress hydrique dans les sols superficiels. Dans les zones les plus touch\u00e9es, le taux de satisfaction des besoins en eau ne d\u00e9passe pas 50 %. Les donn\u00e9es historiques indiquent qu&rsquo;une telle contrainte durant la phase v\u00e9g\u00e9tative entra\u00eene une\u00a0<b>baisse de rendement moyenne de 30 %<\/b>. \u00c0 l&rsquo;inverse, l\u00e0 o\u00f9 ce taux reste sup\u00e9rieur \u00e0 70 %, aucune baisse de rendement n&rsquo;est \u00e0 craindre sur cette p\u00e9riode.<\/div><h2 data-path-to-node=\"23\"><span data-olk-copy-source=\"MessageBody\">\u00a0<\/span><\/h2><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e174262 elementor-widget elementor-widget-text-editor\" data-id=\"e174262\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"Grille\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<div style=\"overflow-x: auto; margin: 25px 0; border: 1px solid #dddddd; border-radius: 4px;\"><h2><b data-olk-copy-source=\"MessageBody\">4. Grille d&rsquo;impact du stress hydrique sur le rendement du tournesol (en %)<\/b><\/h2><p>\u00a0<\/p><table style=\"width: 100%; border-collapse: collapse; min-width: 500px; font-family: Arial, sans-serif; font-size: 14px;\"><thead><tr style=\"background-color: #2c3e50; color: #ffffff; text-align: left;\"><th style=\"padding: 12px; border: 1px solid #dddddd; font-weight: bold;\">PHASE culturALE du tournesol<\/th><th style=\"padding: 12px; border: 1px solid #dddddd; font-weight: bold;\">40 % DE SATISFACTION deS BESOINS<\/th><th style=\"padding: 12px; border: 1px solid #dddddd; font-weight: bold;\"><!--StartFragment--><span data-olk-copy-source=\"MessageBody\">50 % de satisfaction des besoins<\/span><!--EndFragment--><\/th><th style=\"padding: 12px; border: 1px solid #dddddd; font-weight: bold;\"><!--StartFragment--><span data-olk-copy-source=\"MessageBody\">70 % de satisfaction des besoins<\/span><!--EndFragment--><\/th><\/tr><\/thead><tbody><tr style=\"background-color: #ffffff;\"><td style=\"padding: 12px; border: 1px solid #dddddd;\"><strong>De la lev\u00e9e au d\u00e9but de la floraison<\/strong><\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #c0392b; font-weight: bold;\">&#8211; 30 % de rendement<\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #c0392b;\">&#8211; 28 % de rendement<\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #27ae60;\">N\u00e9gligeable (moins de 8 %)<\/td><\/tr><tr style=\"background-color: #f9f9f9;\"><td style=\"padding: 12px; border: 1px solid #dddddd;\"><strong>Du d\u00e9but \u00e0 la fin de la floraison<\/strong><\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #c0392b; font-weight: bold;\">&#8211; 58 % de rendement<\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #c0392b; font-weight: bold;\">&#8211; 42 % de rendement<\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #d35400;\">&#8211; 12 % de rendement<\/td><\/tr><tr style=\"background-color: #ffffff;\"><td style=\"padding: 12px; border: 1px solid #dddddd;\"><strong>Remplissage des grains<\/strong><\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #c0392b;\">&#8211; 38 % de rendement<\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #c0392b;\">&#8211; 33 % de rendement<\/td><td style=\"padding: 12px; border: 1px solid #dddddd; color: #27ae60;\">N\u00e9gligeable (moins de 8 %)<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2e03ebe elementor-widget elementor-widget-image\" data-id=\"2e03ebe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce-1024x682.webp\" class=\"attachment-large size-large wp-image-9456\" alt=\"\" srcset=\"https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce-1024x682.webp 1024w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce-300x200.webp 300w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce-768x512.webp 768w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce-1536x1024.webp 1536w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce-600x400.webp 600w, https:\/\/ragt-seeds.com\/fr\/wp-content\/uploads\/2024\/07\/rgt_vuelta_tournesol_lnoleique_debut_precoce.webp 1772w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-06d8aad elementor-widget elementor-widget-text-editor\" data-id=\"06d8aad\" data-element_type=\"widget\" data-e-type=\"widget\" id=\"d\u00e9clencher_irrigation\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2 data-path-to-node=\"31\">5. <b data-olk-copy-source=\"MessageBody\">D\u00e9clencher l&rsquo;irrigation : valoriser chaque millim\u00e8tre disponible<\/b><\/h2><p>\u00a0<\/p><div>Bien que l&rsquo;irrigation du tournesol reste minoritaire sur le territoire, elle s&rsquo;av\u00e8re hautement rentable l\u00e0 o\u00f9 les volumes et le mat\u00e9riel le permettent. L&rsquo;objectif est de positionner judicieusement de 1 \u00e0 3 tours d&rsquo;eau.<\/div><ul data-path-to-node=\"23\"><li><div role=\"presentation\"><b>La r\u00e8gle historique :<\/b>\u00a010 mm d&rsquo;eau d&rsquo;irrigation apport\u00e9s permettent de gagner en moyenne 1 q\/ha (synth\u00e8se sur 18 ans d&rsquo;essais).<\/div><\/li><li><div role=\"presentation\"><b>L&rsquo;\u00e9clairage r\u00e9cent :<\/b>\u00a0Une \u00e9tude de Terres Inovia est venue affiner cette r\u00e8gle en conditions de sol superficiel et d&rsquo;ann\u00e9e s\u00e8che. Un passage unique cibl\u00e9 de\u00a0<b>35 mm<\/b>\u00a0permet d&rsquo;obtenir un gain moyen de\u00a0<b>6 q\/ha<\/b> par rapport \u00e0 un t\u00e9moin non irrigu\u00e9.<\/div><\/li><\/ul><h2><b data-olk-copy-source=\"MessageBody\">6. Risque de canicule pendant la floraison : vigilance sur la fertilit\u00e9 des fleurs<br \/><br \/><\/b><\/h2><div>Le devenir des composantes de rendement va largement se jouer dans les semaines \u00e0 venir. Le stress hydrique est d&rsquo;autant plus redoutable s&rsquo;il co\u00efncide avec la floraison, alors que les temp\u00e9ratures actuelles acc\u00e9l\u00e8rent le cycle de la culture et provoquent les premi\u00e8res floraisons pr\u00e9coces.<\/div><div>Au-del\u00e0 du manque d&rsquo;eau au sol, les fortes chaleurs agissent directement sur la physiologie de la plante :<\/div><blockquote><div><b>Seuil critique (33 \u00e0 35\u00b0C) :<\/b>\u00a0Des temp\u00e9ratures atteignant ou d\u00e9passant ce niveau en pleine floraison alt\u00e8rent la viabilit\u00e9 du pollen et la fertilit\u00e9 g\u00e9n\u00e9rale des fleurs. Le risque majeur est une mauvaise f\u00e9condation entra\u00eenant des avortements de grains et une hausse significative du taux d&rsquo;ak\u00e8nes vides (grains blancs).<\/div><\/blockquote><div><span data-olk-copy-source=\"MessageBody\">L&rsquo;impact final d\u00e9pendra de la dur\u00e9e et de la r\u00e9currence de ces pics de chaleur, les fleurs du capitule ne s&rsquo;ouvrant pas toutes simultan\u00e9ment. <\/span><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-54e0d1b e-flex e-con-boxed e-con e-child\" data-id=\"54e0d1b\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;jet_parallax_layout_list&quot;:[]}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-572b473 elementor-widget elementor-widget-heading\" data-id=\"572b473\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Conclusion : un \u00e9quilibre \u00e0 trouver entre r\u00e9silience naturelle et interventions strat\u00e9giques<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div data-dce-text-color=\"#FFFFFF\" data-dce-advanced-background-color=\"#273540\" class=\"elementor-element elementor-element-eb2c21d elementor-widget elementor-widget-text-editor\" data-id=\"eb2c21d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p data-path-to-node=\"4\">Face \u00e0 ce double d\u00e9fi combinant stress thermique et hydrique, le tournesol d\u00e9montre une fois de plus ses capacit\u00e9s d&rsquo;adaptation physiologiques. Toutefois, la grande h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9 des biomasses et les seuils critiques de satisfaction en eau observ\u00e9s cette ann\u00e9e rappellent que la vigilance reste de mise, en particulier dans les parcelles aux sols les plus superficiels.<\/p><p data-path-to-node=\"5\">\u00c0 l\u2019aube d&rsquo;une floraison qui s&rsquo;annonce pr\u00e9coce et expos\u00e9e \u00e0 des risques de fortes chaleurs, la gestion de l&rsquo;eau sera le principal facteur de r\u00e9silience. L\u00e0 o\u00f9 la ressource est accessible, le d\u00e9clenchement cibl\u00e9 de l&rsquo;irrigation s&rsquo;impose comme un levier hautement rentable pour s\u00e9curiser la fertilit\u00e9 des fleurs et pr\u00e9server le remplissage des grains. Pour l&rsquo;ensemble des producteurs, les prochaines semaines et les observations de terrain \u00e0 venir, face aux \u00e9pisodes de canicules qui s&#8217;emballent, seront d\u00e9cisives pour \u00e9valuer le potentiel r\u00e9el de cette r\u00e9colte 2026.\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b2cc141 elementor-align-left elementor-widget__width-auto animated-fast elementor-mobile-align-justify elementor-tablet-align-left elementor-widget-mobile__width-inherit boutonjaune elementor-invisible elementor-widget elementor-widget-button\" data-id=\"b2cc141\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;fadeInUp&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-float\" href=\"https:\/\/ragt-seeds.com\/fr\/contacts\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contactez votre expert<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Sem\u00e9s dans le courant du mois d&rsquo;avril, les tournesols font face cette ann\u00e9e \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es qui accentuent le manque d&rsquo;eau dans les parcelles. Ce contexte climatique p\u00e8se directement sur le potentiel de rendement, en particulier dans les parcelles \u00e0 faible R\u00e9serve Utile (RU) ou n&rsquo;ayant b\u00e9n\u00e9fici\u00e9 que de faibles pr\u00e9cipitations. Analyse de la [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":9515,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","iawp_total_views":66,"ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[253],"tags":[267,286],"class_list":["post-15529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tournesol","tag-actualites","tag-innovations","entry","has-media"],"acf":[],"_links":{"self":[{"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/posts\/15529","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/users\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/comments?post=15529"}],"version-history":[{"count":11,"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/posts\/15529\/revisions"}],"predecessor-version":[{"id":15541,"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/posts\/15529\/revisions\/15541"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ragt-seeds.com\/fr\/wp-json\/wp\/v2\/media\/9515"}],"wp:attachment":[{"href":"https:\/\/ragt-seeds.com\/fr\/wp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