{"id":444,"date":"2015-02-05T05:00:00","date_gmt":"2015-02-05T10:00:00","guid":{"rendered":"https:\/\/maizex.com\/labsorption-dazote-par-le-mais-est-ce-que-les-tendances-changent-et-comment-peut-on-les-gerer\/"},"modified":"2022-08-02T09:21:54","modified_gmt":"2022-08-02T13:21:54","slug":"labsorption-dazote-par-le-mais-est-ce-que-les-tendances-changent-et-comment-peut-on-les-gerer","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/labsorption-dazote-par-le-mais-est-ce-que-les-tendances-changent-et-comment-peut-on-les-gerer\/","title":{"rendered":"L\u2019absorption d\u2019azote par le ma\u00efs \u2013 Est-ce que les tendances changent et comment peut-on les g\u00e9rer?"},"content":{"rendered":"<p>Au fur et &agrave; mesure que de nouveaux hybrides de ma&iuml;s se d&eacute;veloppent, la quantit&eacute; et le moment de leur absorption d&rsquo;azote se modifient. Selon une recherche effectu&eacute;e par Tony Vyn, professeur d&rsquo;agronomie &agrave; l&rsquo;Universit&eacute; Purdue, &laquo;&nbsp;les nouveaux hybrides (apr&egrave;s 1990) se sont accapar&eacute;s jusqu&rsquo;&agrave; 27 % plus d&rsquo;azote tir&eacute; du sol apr&egrave;s la floraison, en comparaison des vieux plants de ma&iuml;s (avant 1990). En fait, l&rsquo;absorption d&rsquo;azote apr&egrave;s la floraison chez ces hybrides d&rsquo;apr&egrave;s 1990 se chiffre en moyenne &agrave; 56 % de l&rsquo;azote accumul&eacute; par le grain &agrave; la fin de la saison.&nbsp;&raquo; &nbsp; &nbsp;<\/p>\n\n<p>Il continue &eacute;galement en affirmant que &laquo;&nbsp;les hybrides de ma&iuml;s d&rsquo;apr&egrave;s 1990 utilisent l&rsquo;azote de mani&egrave;re plus efficace, ce qui signifie moins d&rsquo;azote n&eacute;cessaire par unit&eacute; de rendement. Cependant, alors que ces plants augmentent leur utilisation d&rsquo;azote, ils absorbent davantage les autres mati&egrave;res nutritives, ce qui affecte la quantit&eacute; &agrave; appliquer et le moment o&ugrave; les producteurs doivent intervenir avec ces mati&egrave;res nutritives.&nbsp;&raquo;<\/p>\n\n<p>Ces deux affirmations nous am&egrave;nent &agrave; poser certaines questions importantes&nbsp;:<\/p>\n\n<ol>\n\t<li>&nbsp;&nbsp;&nbsp; Est-ce que j&rsquo;ai besoin d&rsquo;appliquer autant d&rsquo;azote sur ma culture de ma&iuml;s que je l&rsquo;ai toujours fait?<\/li>\n\t<li>&nbsp;&nbsp;&nbsp; Est-ce que le bon moment d&rsquo;application a quelque chose &agrave; voir avec le rendement global attendu?<\/li>\n<\/ol>\n\n<p>Pour r&eacute;pondre &agrave; cela, nous devons d&rsquo;abord bien comprendre quand l&rsquo;absorption de l&rsquo;azote se produit.<\/p>\n\n<p>Le graphique ci-dessous, provenant du d&eacute;partement des sciences v&eacute;g&eacute;tales de l&rsquo;Universit&eacute; du Missouri, indique le moment o&ugrave; l&rsquo;absorption de l&rsquo;azote se produit. Comme vous pouvez le constater, 40 % de l&rsquo;azote est requis du stade R1 (floraison femelle) au stade R6 (maturit&eacute; physiologique). &nbsp;&nbsp;<\/p>\n\n<p>Ce 40 % requis ne peut pas toujours &ecirc;tre disponible au stade R1, ce qui signifie que nous n&rsquo;aurons peut-&ecirc;tre pas maximis&eacute; notre rendement potentiel. Les conditions environnementales influencent la quantit&eacute; d&rsquo;azote disponible durant les mois de l&rsquo;&eacute;t&eacute;. Pour ceux qui proc&egrave;dent &agrave; l&rsquo;application de tout l&rsquo;engrais azot&eacute; avant de semer, des conditions climatiques humides et pluvieuses du stade VE au stade V18 se traduiront par une disponibilit&eacute; plus r&eacute;duite qu&rsquo;attendue en azote&nbsp;: dans ce cas, d&rsquo;autres strat&eacute;gies d&rsquo;application pourraient &ecirc;tre &eacute;tudi&eacute;es. &nbsp; &nbsp; &nbsp;<\/p>\n\n<p>R&eacute;cemment, une nouvelle pratique s&rsquo;est impos&eacute;e, soit d&rsquo;appliquer une portion de l&rsquo;azote requis lors du semis, &agrave; partir du semoir, suivie d&rsquo;une autre application lat&eacute;rale d&rsquo;azote vers le stade V3-V4 (4<sup>e<\/sup> ou 5<sup>e<\/sup> feuille). Cette m&eacute;thode prolonge la disponibilit&eacute; d&rsquo;azote tout au long de la saison de croissance. On a beaucoup parl&eacute; &eacute;galement d&rsquo;une application a&eacute;rienne au stade R1, avec des &eacute;quipements &agrave; haut d&eacute;gagement faisant appel &agrave; des applicateurs en Y ou &agrave; des pulv&eacute;risateurs &agrave; jets dirig&eacute;s&nbsp;: toutefois, la recherche se poursuit afin de d&eacute;terminer si cette m&eacute;thode constitue une solution valable.<\/p>\n\n<p>Comme vous pouvez le constater, les producteurs doivent consid&eacute;rer plusieurs &eacute;l&eacute;ments lorsqu&rsquo;ils cultivent du ma&iuml;s et qu&rsquo;ils doivent g&eacute;rer la disponibilit&eacute; en azote. Effectuez quelques recherches sur votre propre ferme et surveillez votre culture, afin de d&eacute;terminer ce qui fonctionne bien pour vous pour obtenir la meilleure r&eacute;colte possible. Durant l&rsquo;&eacute;t&eacute; qui vient, je me propose de r&eacute;aliser des essais avec des producteurs, afin de mieux comprendre les meilleures m&eacute;thodes, ainsi que celles qui sont les plus &eacute;conomiques, pour g&eacute;rer la disponibilit&eacute; en azote.<\/p>\n\n<p><em>Chuck Belanger, Semences Maizex<\/em><br \/>\n<em>Sp&eacute;cialiste en rendement pour les comt&eacute;s de North Essex et de South Chatham-Kent<\/em><br \/>\n<em>Twitter: <\/em><em>@sprayman63<\/em>&nbsp;<\/p>\n\n<p>R&eacute;f&eacute;rence&nbsp;:&nbsp;<\/p>\n\n<p>Ignacio A. Ciampitti et Tony J. Vyn. \/ Grain Nitrogen Source Changes Over Time in Maize: A Review. Crop Science, 2013. http:\/\/www.purdue.edu\/newsroom\/releases\/2013\/Q2\/nitrogen-key-to-uptake-of-other-corn-nutrients,-study-shows.html<br \/>\nPeter C. Scharf et John A. Lory. \/ Best Management Practices for Nitrogen Fertilizer in Missouri. IPM1027, Ao&ucirc;t 2006. http:\/\/plantsci.missouri.edu\/nutrientmanagement\/nitrogen\/practices.htm&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Au fur et &agrave; mesure que de nouveaux hybrides de ma&iuml;s se d&eacute;veloppent, la quantit&eacute; et le moment de leur absorption d&rsquo;azote se modifient. Selon une recherche effectu&eacute;e par Tony&#8230;<\/p>\n","protected":false},"author":2,"featured_media":280,"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],"class_list":["post-444","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-agronomie","tag-gestion-des-champs"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L\u2019absorption d\u2019azote par le ma\u00efs \u2013 Est-ce que les tendances changent et comment peut-on les g\u00e9rer? - 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\/labsorption-dazote-par-le-mais-est-ce-que-les-tendances-changent-et-comment-peut-on-les-gerer\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L\u2019absorption d\u2019azote par le ma\u00efs \u2013 Est-ce que les tendances changent et comment peut-on les g\u00e9rer? - Maizex Seeds Inc.\" \/>\n<meta property=\"og:description\" content=\"Au fur et &agrave; mesure que de nouveaux hybrides de ma&iuml;s se d&eacute;veloppent, la quantit&eacute; et le moment de leur absorption d&rsquo;azote se modifient. 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