{"id":451,"date":"2015-10-13T22:57:20","date_gmt":"2015-10-14T02:57:20","guid":{"rendered":"https:\/\/maizex.com\/perte-de-rendement-lors-de-la-recolte\/"},"modified":"2022-08-02T09:21:52","modified_gmt":"2022-08-02T13:21:52","slug":"perte-de-rendement-lors-de-la-recolte","status":"publish","type":"post","link":"https:\/\/maizex.com\/fr\/perte-de-rendement-lors-de-la-recolte\/","title":{"rendered":"Perte de rendement lors de la r\u00e9colte"},"content":{"rendered":"<p>Alors que le temps des r&eacute;coltes 2015 de ma&iuml;s d&eacute;bute, il fait bon se rappeler des meilleures conditions pour effectuer ses r&eacute;coltes et des situations o&ugrave; peuvent survenir des pertes de rendement occasionn&eacute;es par la moissonneuse-batteuse.&nbsp;&nbsp;<\/p>\n\n<p>La p&eacute;riode des r&eacute;coltes est habituellement d&eacute;termin&eacute;e par la qualit&eacute; de la tige, les conditions du champ, la flexibilit&eacute; de l&rsquo;&eacute;pi et le degr&eacute; d&rsquo;humidit&eacute; du grain. &Agrave; cet &eacute;gard, le degr&eacute; optimal d&rsquo;humidit&eacute; du grain s&rsquo;&eacute;tablit entre 22 et 25 %; le ma&iuml;s s&rsquo;&eacute;gr&egrave;ne alors facilement et la r&eacute;sistance du plant &agrave; la verse est encore habituellement tr&egrave;s acceptable. Dans le champ, le plant de ma&iuml;s est en train de s&eacute;cher rapidement et plusieurs champs peuvent m&ecirc;me pr&eacute;senter des degr&eacute;s d&rsquo;humidit&eacute; se situant autour de 20 %.<\/p>\n\n<p>Le fait d&rsquo;attendre que le niveau d&rsquo;humidit&eacute; se situe sous les 19% peut certainement permettre des &eacute;conomies en frais de s&eacute;chage, mais cela peut &eacute;galement comporter des effets n&eacute;gatifs, comme des pertes de rendement suppl&eacute;mentaires pour des consid&eacute;rations purement m&eacute;caniques (grain qui &eacute;clate ou qui ne se rend pas &agrave; la moissonneuse-batteuse), pour des &eacute;pis qui tombent au sol et pour des plants qui versent.<\/p>\n\n<p>Une r&eacute;colte de ma&iuml;s plus sec comporte un avantage en co&ucirc;t de s&eacute;chage, mais elle peut accroitre la perte de rendement provoqu&eacute;e par l&rsquo;&eacute;quipement de r&eacute;colte. Le s&eacute;chage naturel au champ peut m&ecirc;me g&eacute;n&eacute;rer une perte de rendement variant de 2 &agrave; 8 %. Cette perte r&eacute;sulte de plusieurs facteurs tels que&nbsp;:<\/p>\n\n<ul>\n\t<li>Perte d&rsquo;&eacute;pis caus&eacute;e par la vis d&rsquo;alimentation (provoqu&eacute;e habituellement par une vitesse excessive ou bien trop lente de la machinerie),<\/li>\n\t<li>Perte de grains caus&eacute;e par la vis d&rsquo;alimentation (pertes qui augmentent d&egrave;s que le niveau d&rsquo;humidit&eacute; se situe sous les 20 %),<\/li>\n\t<li>Perte caus&eacute;e par le cylindre de battage (vitesse trop grande du batteur et du rotor qui brisent les grains) et<\/li>\n\t<li>Perte caus&eacute;e lors de la s&eacute;paration et du nettoyage (grains qui passent tout droit sur les grilles).<\/li>\n<\/ul>\n\n<p>En plus des pertes de rendement, la pr&eacute;sence de &laquo;&nbsp;ma&iuml;s spontan&eacute;&nbsp;&raquo; peut devenir un probl&egrave;me l&rsquo;ann&eacute;e suivante. Assurez-vous d&rsquo;en discuter avec votre manufacturier d&rsquo;&eacute;quipement et lisez bien le manuel d&rsquo;instruction de votre moissonneuse-batteuse, afin d&rsquo;effectuer tous les ajustements appropri&eacute;s au champ.<\/p>\n\n<p>Voici quelques chiffres qui pourront vous servir de guide, afin de d&eacute;terminer le niveau des pertes de rendement caus&eacute;es directement par votre &eacute;quipement de r&eacute;colte&nbsp;:<\/p>\n\n<ul>\n\t<li>2 grains de ma&iuml;s par pied carr&eacute; = 1 boisseau par acre (Guide pratique &ndash; Universit&eacute; Iowa State)<\/li>\n\t<li>4 grains de soya par pied carr&eacute; = 1 boisseau par acre<\/li>\n<\/ul>\n\n<p><em>Laura Johnston, CCA-ON, Semences Maizex<br \/>\n<span style=\"font-size: 1em; line-height: 1.4625em;\">G&eacute;rant du territoire&nbsp;pour le comt&eacute; de West Elgin<\/span><br \/>\n<span style=\"font-size: 1em; line-height: 1.4625em;\">Twitter :&nbsp;@lmjohnston8 &nbsp;<\/span><\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Alors que le temps des r&eacute;coltes 2015 de ma&iuml;s d&eacute;bute, il fait bon se rappeler des meilleures conditions pour effectuer ses r&eacute;coltes et des situations o&ugrave; peuvent survenir des pertes&#8230;<\/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":[446,440],"class_list":["post-451","post","type-post","status-publish","format-standard","hentry","category-agronomie","tag-mais-grain","tag-tips-fr"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - 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