{"id":458,"date":"2016-06-28T15:26:46","date_gmt":"2016-06-28T19:26:46","guid":{"rendered":"https:\/\/maizex.com\/carence-en-manganese\/"},"modified":"2022-08-02T09:21:06","modified_gmt":"2022-08-02T13:21:06","slug":"carence-en-manganese","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/carence-en-manganese\/","title":{"rendered":"Carence en mangan\u00e8se"},"content":{"rendered":"

Le manganèse (Mn) constitue l’un des neuf oligo-éléments essentiels pour assurer la croissance d’un plant. Le maïs n’est seulement qu’un consommateur modeste de manganèse : aussi, dans la plupart des sols, une telle carence se révélera peu fréquente. Les sols avec une charge organique élevée (avec fumier) peuvent fréquemment être diagnostiqués avec un certain degré de carence en manganèse (Mn). Dans une terre minérale, avec des conditions sèches et où le sol est particulièrement meuble, le manganèse se transformera par oxydation, de telle façon qu’il deviendra indisponible pour le plant de maïs. Dans de tels cas, les secteurs plus humides du champ ou qui ont été stabilisés par la circulation de véhicules montreront moins de carence en manganèse (Mn) que les autres zones qui sont plus sèches et plus meubles (voir l’illustration #1).       <\/p>\n\n

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\nIllustration #1.   <\/strong>Carence en manganèse (Mn) pour le maïs. Dans ce cas, une terre sablonneuse et des précipitations sous la moyenne ont entrainé une carence en Mn. Prenez note que là où il y a des traces de circulation – principalement sous les quatre rangées du centre du semoir – la carence est absente.<\/figcaption>\n<\/figure>\n\n


\nLe manganèse est un élément très figé et stable dans le plant, ce qui fait que les symptômes de carence en Mn sont d’abord perçus sur les jeunes feuilles. Une carence en Mn se reconnait par une chlorose internervale (jaunissement entre les nervures des feuilles) alors que les nervures elles-mêmes demeurent de couleur vert foncé (Illustration #2). Une carence en manganèse ressemble à une carence en magnésium (Mg), mais cette dernière présente souvent des symptômes plus prononcés sur les plus vieilles feuilles du plant.      <\/p>\n\n

\"\"\n

\nIllustration #2.  <\/strong>Une carence en manganèse se traduit par une hauteur anémique du plant, une apparence de couleur vert pâle et l’apparition de bandes (chlorose internervale) – plus apparentes sur les nouvelles feuilles.<\/figcaption>\n<\/figure>\n\n


\nL’apparition d’une carence en manganèse sur le maïs pourra être de courte durée, si des précipitations viennent réduire l’oxydation du Mn et\/ou si la recherche racinaire du plant améliore l’assimilation en Mn. Une carence en manganèse peut être traitée durant la culture avec une application foliaire de Mn chélaté ou de sulfate de manganèse, en visant une application de 0,5 à 2 livres de Mn par acre. Les champs qui sont susceptibles de souffrir d’une carence en Mn montreront encore plus souvent des signes de telles carences avec le soya, puisque le soya est un consommateur plus élevé de Mn.  <\/p>\n\n

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\nIllustration #3.  <\/strong>Carence en manganèse (Mn) pour le soya. Prenez note des symptômes les plus marqués sur les nouvelles feuilles, avec une forte décoloration internervale.  <\/figcaption>\n<\/figure>\n\n


\nGreg Stewart
\nExpert en agronomie, Semences Maizex<\/em><\/p>\n\n


\nEst-ce que vous aimez ce que vous êtes en train de lire? Inscrivez-vous afin de recevoir à chaque semaine, dans votre boite de réception, les mises à jour agronomiques de Greg Stewart et de l’Équipe agronomique de Maizex! CLIQUER ICI<\/a><\/p>","protected":false},"excerpt":{"rendered":"

Le manganèse (Mn) constitue l’un des neuf oligo-éléments essentiels pour assurer la croissance d’un plant. Le maïs n’est seulement qu’un consommateur modeste de manganèse : aussi, dans la plupart des sols,…<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"footnotes":"","_tec_slr_enabled":"","_tec_slr_layout":""},"categories":[63],"tags":[452,444,446,65],"class_list":["post-458","post","type-post","status-publish","format-standard","hentry","category-agronomie","tag-gestion-des-champs","tag-mais-ensilage","tag-mais-grain","tag-soya"],"acf":[],"yoast_head":"\nCarence en mangan\u00e8se - Maizex Seeds Inc.<\/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:\/\/maizex.com\/fr\/carence-en-manganese\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Carence en mangan\u00e8se - Maizex Seeds Inc.\" \/>\n<meta property=\"og:description\" content=\"Le manganèse (Mn) constitue l’un des neuf oligo-éléments essentiels pour assurer la croissance d’un plant. 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