{"id":3054,"date":"2017-09-21T15:13:16","date_gmt":"2017-09-21T13:13:16","guid":{"rendered":"http:\/\/www.supagro.fr\/wordpress\/modeleco\/?page_id=3054"},"modified":"2017-12-01T11:47:22","modified_gmt":"2017-12-01T10:47:22","slug":"activite-28-b-determiner-une-rotation-dun-modele-recursif","status":"publish","type":"page","link":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/auto-formation\/sequence3\/cours-3-2-les-modeles-dynamiques\/lecon-28-les-modeles-recursifs\/activite-28-b-determiner-une-rotation-dun-modele-recursif\/","title":{"rendered":"Activit\u00e9 28 A : Mod\u00e8le \u00ab\u00a0Centre-Val de Loire\u00a0\u00bb &#8211; Commenter un fichier de sortie &#8211; La succession des cultures dans le temps"},"content":{"rendered":"<div class=\"entry-content\">\n<h4 style=\"text-align: right\"><span style=\"text-decoration: underline\">Dur\u00e9e : environ 30 minutes<\/span><\/h4>\n<p>&nbsp;<\/p>\n<p><strong>Le mod\u00e8le suivant a \u00e9t\u00e9 \u00e9crit lors de la le\u00e7on 28 : <a href=\"http:\/\/www.supagro.fr\/ModelEco\/modeles\/modelEco_dynamique.zip\">modelEco_dynamique.gms<\/a>. Il est \u00e9crit sur une p\u00e9riode de 20 ans. <\/strong><\/p>\n<\/div>\n<div class=\"entry-content\"><strong>Regardez le fichier lst. Quelles sont les rotations faites par l&rsquo;agriculteur ? Quelle est l&rsquo;influence de l&rsquo;assolement initial ? Que pouvez-vous dire des \u00ab\u00a0EPS\u00a0\u00bb qui apparaissent dans les valeurs marginales des variables ? Comment interpr\u00e9ter la valeur duale de la contrainte ROT ?<br \/>\n<\/strong><\/div>\n<div class=\"entry-content\"><strong><br \/>\n\u00ab\u00a0<\/strong>Un agriculteur en grande culture de la r\u00e9gion Centre-Val de Loire avec cultures sp\u00e9ciales (donn\u00e9es INOSYS Syst\u00e8me GC 131) dispose de 110 ha de terre. L\u2019irrigation et l\u2019environnement \u00e9conomique de son exploitation lui donne le choix entre un grand \u00e9ventail de productions possibles : bl\u00e9 tendre, bl\u00e9 dur, orge de printemps, pommes de terre de consommation, betteraves et colza. Cinq de ces cultures sont irrigu\u00e9es pour permettre une production r\u00e9guli\u00e8re de qualit\u00e9. Il dispose de 60 000 m3 d\u2019eau.<br \/>\nLes besoins en irrigation et les donn\u00e9es \u00e9conomiques sont donn\u00e9es dans les tableaux ci-dessous\u00a0:<\/p>\n<table>\n<tbody>\n<tr>\n<td colspan=\"2\" width=\"604\"><strong>Besoin en eau d&rsquo;irrigation<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"302\"><strong>Cultures<\/strong><\/td>\n<td width=\"302\"><strong>Vol en m3\/ha<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"302\">Bl\u00e9 tendre<\/td>\n<td width=\"302\">175<\/td>\n<\/tr>\n<tr>\n<td width=\"302\">Bl\u00e9 dur<\/td>\n<td width=\"302\">350<\/td>\n<\/tr>\n<tr>\n<td width=\"302\">Orge de print<\/td>\n<td width=\"302\">700<\/td>\n<\/tr>\n<tr>\n<td width=\"302\">Pdt conso<\/td>\n<td width=\"302\">1800<\/td>\n<\/tr>\n<tr>\n<td width=\"302\">Betteraves<\/td>\n<td width=\"302\">1750<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table>\n<tbody>\n<tr>\n<td colspan=\"4\" width=\"604\"><strong>Autres donn\u00e9es technico-\u00e9conomiques<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"152\"><strong>Cultures<\/strong><\/td>\n<td width=\"154\"><strong>Rendements (qx\/ha)<\/strong><\/td>\n<td width=\"146\"><strong>Prix\/qx (\u20ac)<\/strong><\/td>\n<td width=\"152\"><strong>Charges totales (\u20ac\/ha)<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"152\">Bl\u00e9 tendre<\/td>\n<td width=\"154\">85<\/td>\n<td width=\"146\">16<\/td>\n<td width=\"152\">460<\/td>\n<\/tr>\n<tr>\n<td width=\"152\">Bl\u00e9 dur<\/td>\n<td width=\"154\">71<\/td>\n<td width=\"146\">28<\/td>\n<td width=\"152\">565<\/td>\n<\/tr>\n<tr>\n<td width=\"152\">Orge de print<\/td>\n<td width=\"154\">70<\/td>\n<td width=\"146\">17.5<\/td>\n<td width=\"152\">470<\/td>\n<\/tr>\n<tr>\n<td width=\"152\">Pdt conso.<\/td>\n<td width=\"154\">495<\/td>\n<td width=\"146\">14<\/td>\n<td width=\"152\">4210<\/td>\n<\/tr>\n<tr>\n<td width=\"152\">Betteraves<\/td>\n<td width=\"154\">950<\/td>\n<td width=\"146\">2.6<\/td>\n<td width=\"152\">1082<\/td>\n<\/tr>\n<tr>\n<td width=\"152\">Colza<\/td>\n<td width=\"154\">40<\/td>\n<td width=\"146\">38<\/td>\n<td width=\"152\">490<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><em>Source\u00a0: r\u00e9seau INOSYS des chambres d\u2019agriculture de la r\u00e9gion Centre Val de Loire. 2016<\/em><\/p>\n<p>Les rendements des cultures sont fonction des pr\u00e9c\u00e9dents culturaux\u00a0(un z\u00e9ro signifie qu\u2019il n\u2019est pas possible de faire une culture avec ce pr\u00e9c\u00e9dent cultural) :<\/p>\n<table>\n<tbody>\n<tr>\n<td rowspan=\"2\" width=\"170\"><strong>Cultures<\/strong><\/td>\n<td style=\"text-align: center\" colspan=\"6\"><strong>Pr\u00e9c\u00e9dents culturaux<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"51\"><strong>Bl\u00e9 tendre<\/strong><\/td>\n<td width=\"96\"><strong>Bl\u00e9 dur<\/strong><\/td>\n<td width=\"112\"><strong>Betterave<\/strong><\/td>\n<td width=\"96\"><strong>Colza<\/strong><\/td>\n<td width=\"98\"><strong>Pomme de terre conso<\/strong><\/td>\n<td width=\"96\"><strong>Orge<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Bl\u00e9 tendre<\/strong><\/td>\n<td width=\"51\">0<\/td>\n<td width=\"96\">80<\/td>\n<td width=\"112\">85<\/td>\n<td width=\"96\">85<\/td>\n<td width=\"98\">85<\/td>\n<td width=\"96\">80<\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Bl\u00e9 dur<\/strong><\/td>\n<td width=\"51\">65<\/td>\n<td width=\"96\">0<\/td>\n<td width=\"112\">70<\/td>\n<td width=\"96\">70<\/td>\n<td width=\"98\">70<\/td>\n<td width=\"96\">65<\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Betterave<\/strong><\/td>\n<td width=\"51\">950<\/td>\n<td width=\"96\">950<\/td>\n<td width=\"112\"><strong>0<\/strong><\/td>\n<td width=\"96\"><strong>0<\/strong><\/td>\n<td width=\"98\"><strong>0<\/strong><\/td>\n<td width=\"96\"><strong>950<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Colza<\/strong><\/td>\n<td width=\"51\"><strong>40<\/strong><\/td>\n<td width=\"96\"><strong>40<\/strong><\/td>\n<td width=\"112\"><strong>0<\/strong><\/td>\n<td width=\"96\"><strong>0<\/strong><\/td>\n<td width=\"98\"><strong>0<\/strong><\/td>\n<td width=\"96\"><strong>40<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Pomme de terre conso<\/strong><\/td>\n<td width=\"51\"><strong>495<\/strong><\/td>\n<td width=\"96\"><strong>4954<\/strong><\/td>\n<td width=\"112\"><strong>0<\/strong><\/td>\n<td width=\"96\"><strong>0<\/strong><\/td>\n<td width=\"98\"><strong>0<\/strong><\/td>\n<td width=\"96\"><strong>495<\/strong><\/td>\n<\/tr>\n<tr>\n<td width=\"170\"><strong>Orge<\/strong><\/td>\n<td width=\"51\"><strong>70<\/strong><\/td>\n<td width=\"96\"><strong>60<\/strong><\/td>\n<td width=\"112\"><strong>70<\/strong><\/td>\n<td width=\"96\"><strong>70<\/strong><\/td>\n<td width=\"98\"><strong>70<\/strong><\/td>\n<td width=\"96\"><strong>0<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>L\u2019assolement initial est\u00a0: 10 ha de bl\u00e9 tendre, 20 ha de bl\u00e9 dur, 30 ha de betterave, 0 ha de colza, 40 ha de pomme de terre et 10 ha d\u2019orge.<\/p>\n<p>L&rsquo;agriculteur maximise son profit chaque ann\u00e9e.\u00a0\u00bb<\/p>\n<p><strong>\u00a0<\/strong><\/p>\n<p><strong>Puis v\u00e9rifier la solution : <a href=\"http:\/\/www.supagro.fr\/wordpress\/modeleco\/auto-formation\/sequence3\/cours-3-2-les-modeles-dynamiques\/lecon-28-les-modeles-recursifs\/activite-28-b-determiner-une-rotation-dun-modele-recursif\/activite-28-b-determiner-une-rotation-dun-modele-recursif-solution\/\"><img loading=\"lazy\" decoding=\"async\" class=\"\" src=\"http:\/\/www.supagro.fr\/wordpress\/modeleco\/files\/2016\/08\/solution.png\" alt=\"solution\" width=\"92\" height=\"45\" \/><\/a><\/strong><br \/>\n<a href=\"http:\/\/www.supagro.fr\/wordpress\/modeleco\/auto-formation\/sequence3\/cours-3-2-les-modeles-dynamiques\/\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright\" src=\"http:\/\/www.supagro.fr\/wordpress\/modeleco\/files\/2016\/07\/retourAuSommaireDuCours.png\" alt=\"retourAuSommaireDuCours\" width=\"200\" height=\"54\" \/><\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Dur\u00e9e : environ 30 minutes &nbsp; Le mod\u00e8le suivant a \u00e9t\u00e9 \u00e9crit lors de la le\u00e7on 28 : modelEco_dynamique.gms. Il est \u00e9crit sur une p\u00e9riode de 20 ans. Regardez le fichier lst. Quelles sont les rotations faites par l&rsquo;agriculteur ? <a class=\"more-link\" href=\"https:\/\/www.supagro.fr\/wordpress\/modeleco\/auto-formation\/sequence3\/cours-3-2-les-modeles-dynamiques\/lecon-28-les-modeles-recursifs\/activite-28-b-determiner-une-rotation-dun-modele-recursif\/\">Continuer la lecture <span class=\"screen-reader-text\">  Activit\u00e9 28 A : Mod\u00e8le \u00ab\u00a0Centre-Val de Loire\u00a0\u00bb &#8211; Commenter un fichier de sortie &#8211; La succession des cultures dans le temps<\/span><span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":92,"featured_media":0,"parent":3005,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3054","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/pages\/3054","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/users\/92"}],"replies":[{"embeddable":true,"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/comments?post=3054"}],"version-history":[{"count":19,"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/pages\/3054\/revisions"}],"predecessor-version":[{"id":3643,"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/pages\/3054\/revisions\/3643"}],"up":[{"embeddable":true,"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/pages\/3005"}],"wp:attachment":[{"href":"https:\/\/www.supagro.fr\/wordpress\/modeleco\/wp-json\/wp\/v2\/media?parent=3054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}