{"id":2779,"date":"2023-09-13T10:14:56","date_gmt":"2023-09-13T08:14:56","guid":{"rendered":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/?p=2779"},"modified":"2023-11-30T19:11:54","modified_gmt":"2023-11-30T18:11:54","slug":"structure-de-sols-en-fonction-du-couvert-et-du-travail-du-sol","status":"publish","type":"post","link":"https:\/\/normandiemaine.cerfrance.fr\/arad2\/structure-de-sols-en-fonction-du-couvert-et-du-travail-du-sol\/","title":{"rendered":"Structure de sols en fonction du couvert et du travail du sol"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">Comparaison de la structure de sols : forestier, prairies, culture avec ou sans labour<\/h1>\n\n\n\n<p>Wolfgang STURNY et Andreas CHERVET nous d\u00e9crivent dans cette vid\u00e9o la structure de quatre sols contrast\u00e9s : forestier, en prairies depuis 150 ans, sous ma\u00efs en syst\u00e8me labour et sous ma\u00efs en syst\u00e8me semis direct. <\/p>\n\n\n\n<p>Les pr\u00e9l\u00e8vements ont \u00e9t\u00e9 r\u00e9alis\u00e9s sur la plateforme d&rsquo;Oberhacker en Suisse. Cette plateforme compare diff\u00e9rents syst\u00e8mes labour\/semis direct depuis plus de 20 ans.  <\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Comparatif sol forestier, prairies et cultures plateforme Oberhacker Suisse ARAD\u00b2\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/UqaKBRFpWSc?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">4 structures de sol tr\u00e8s contrast\u00e9es<\/h2>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img data-recalc-dims=\"1\" fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"651\" src=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/09\/4-sols.png?resize=1024%2C651&#038;ssl=1\" alt=\"Pr\u00e9sentation des 4 sols\" class=\"wp-image-2787\" srcset=\"https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/09\/4-sols.png?resize=1024%2C651&amp;ssl=1 1024w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/09\/4-sols.png?resize=300%2C191&amp;ssl=1 300w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/09\/4-sols.png?resize=768%2C488&amp;ssl=1 768w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/09\/4-sols.png?resize=1536%2C976&amp;ssl=1 1536w, https:\/\/i0.wp.com\/normandiemaine.cerfrance.fr\/arad2\/wp-content\/uploads\/sites\/3\/2023\/09\/4-sols.png?w=1600&amp;ssl=1 1600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><figcaption class=\"wp-element-caption\">De gauche \u00e0 droite : sol forestier, sol sous prairies, sol sous ma\u00efs en semis direct et sol sous ma\u00efs en labour<\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Structure du sol forestier<\/h3>\n\n\n\n<p>Le profil de sol se compose en surface de 17 cm de liti\u00e8re, puis d&rsquo;un horizon avec pr\u00e9sence de mati\u00e8res organiques lixivi\u00e9es. Comme le pH est de 4,5, il n&rsquo;y a pas de bioturbation car \u00e0 ce pH, il n&rsquo;y a pas de vers de terre. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure du sol sous prairies<\/h3>\n\n\n\n<p>A l&rsquo;inverse du sol forestier, le sol sous prairies pr\u00e9sente une homog\u00e9n\u00e9it\u00e9 de couleur et de structure. Il n&rsquo;y pas d&rsquo;obstacle et la structure est grumeleuse. Le pH est \u00e0 6,5 et ce sont les vers de terre qui ont brass\u00e9 la terre. <\/p>\n\n\n\n<p>L&rsquo;homme ne peut pas produire ce type de structure m\u00eame avec la meilleure machine. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure du sol sous ma\u00efs avec labour<\/h3>\n\n\n\n<p>Le sol labour\u00e9 pr\u00e9sente une semelle de labour \u00e0 28 cm de profondeur. On observe \u00e9galement du lissage et du tassement. Le point positif du labour est que la min\u00e9ralisation est plus rapide, entrainant une croissance des plantes plus rapide. <\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Structure du sol sous ma\u00efs en semis direct<\/h3>\n\n\n\n<p>On voit que la semelle de labour n&rsquo;existe presque plus et qu&rsquo;on commence \u00e0 avoir une homog\u00e9n\u00e9isation de la couleur. Le sol se rapproche du sol sous prairie. Ils pensaient au d\u00e9marrage que la transition allait durer trois ans. Finalement, le sol a mis 7 ans pour atteindre cet \u00e9tat. <\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Principaux enseignements<\/h2>\n\n\n\n<p>(1) Importance du chaulage pour avoir un pH permettant la pr\u00e9sence de vers de terre qui m\u00e9lange le sol par bioturbation<\/p>\n\n\n\n<p>(2) Effet des pneumatiques pr\u00e9sent en surface et pas en profondeur<\/p>\n\n\n\n<p>(3) Il faut r\u00e9duire le travail du sol pour tendre vers le syst\u00e8me prairies<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Pour en savoir plus, vous pouvez consulter le compte rendu du voyage en Suisse r\u00e9alis\u00e9 par les conseillers agronomes Cerfrance Normandie Maine : <a href=\"https:\/\/normandiemaine.cerfrance.fr\/arad2\/voyage-detude-pour-les-conseillers-techniques-cerfrance\/\">https:\/\/normandiemaine.cerfrance.fr\/arad2\/voyage-detude-pour-les-conseillers-techniques-cerfrance\/<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Comparaison de la structure de sols : forestier, prairies, culture avec ou sans 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