{"id":1614,"date":"2016-11-09T11:17:28","date_gmt":"2016-11-09T10:17:28","guid":{"rendered":"http:\/\/www.supagro.fr\/wordpress\/modeleco\/?page_id=1614"},"modified":"2019-06-28T14:24:20","modified_gmt":"2019-06-28T12:24:20","slug":"activite-12a-ecrire-un-modele-avec-periodes-et-afficher-les-resultats","status":"publish","type":"page","link":"https:\/\/www.supagro.fr\/wordpress\/modelecoen\/auto-formation\/sequence2\/cours1-enrichir-le-modele-de-base\/lecon-12-contrainte-par-periode\/activite-12a-ecrire-un-modele-avec-periodes-et-afficher-les-resultats\/","title":{"rendered":"Activity 12A : \u00ab Wheat\/maize \u00bb model \u2013 i. Adding periods ii. Displaying results"},"content":{"rendered":"

Length : around 25 minutes<\/u><\/h4>\n

The model now takes into account the seasonal nature of labour needs. There are two periods, summer and winter.<\/strong><\/p>\n

i. Adding periods \"\"<\/strong><\/p>\n

Run the\u00a0techn2.gms<\/a>\u00a0model (written in activity 11B or downloadable from the Model Library) and save it under the name travail1.gms. Modify it and add the periods.<\/strong><\/p>\n

\u00a0\u00ab\u00a0A given farm can grow three types of crop, wheat, maize and tomato, and use two different crop practices, extensive and intensive. The area to be cultivated and technology to be used must be determined, knowing that :<\/em><\/p>\n

The objective of the farmer is to maximize his income.
\n<\/em>Water needs are as follows :<\/em><\/p>\n\n\n\n\n\n\n\n
<\/td>\nWater needs (thousands of m3)<\/td>\n<\/tr>\n
Technology<\/td>\nextensive<\/td>\nintensive<\/td>\n<\/tr>\n
Wheat<\/td>\n0<\/td>\n2<\/td>\n<\/tr>\n
Maize<\/td>\n4<\/td>\n6<\/td>\n<\/tr>\n
Tomato<\/td>\n3<\/td>\n5<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/em>Labour needs are as follows\u00a0:<\/strong><\/em><\/p>\n\n\n\n\n\n\n\n\n\n\n\n
<\/td>\nLabour needs (h\/ha)<\/td>\n<\/tr>\n
<\/td>\nTechnology<\/td>\n\u00a0Period<\/td>\n<\/tr>\n
<\/td>\n<\/td>\nWinter<\/td>\nSummer<\/td>\n<\/tr>\n
Wheat<\/td>\nextensive<\/td>\n10<\/td>\n5<\/td>\n<\/tr>\n
<\/td>\nintensive<\/td>\n15<\/td>\n10<\/td>\n<\/tr>\n
Maize<\/td>\nextensive<\/td>\n10<\/td>\n35<\/td>\n<\/tr>\n
<\/td>\nIntensive<\/td>\n10<\/td>\n40<\/td>\n<\/tr>\n
Tomato<\/td>\nextensive<\/td>\n10<\/td>\n70<\/td>\n<\/tr>\n
<\/td>\nIntensive<\/td>\n10<\/td>\n90<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Yields and costs are as follows\u00a0:<\/strong><\/em><\/p>\n\n\n\n\n\n\n\n
<\/td>\nYield (ton\/ha)<\/td>\nCost (\u20ac\/ha)<\/td>\n<\/tr>\n
Technology<\/td>\nextensive<\/td>\nintensive<\/td>\nextensive<\/td>\nIntensive<\/td>\n<\/tr>\n
Wheat<\/td>\n4.5<\/td>\n5.0<\/td>\n250<\/td>\n300<\/td>\n<\/tr>\n
Maize<\/td>\n8.0<\/td>\n10.0<\/td>\n400<\/td>\n500<\/td>\n<\/tr>\n
Tomato<\/td>\n13.0<\/td>\n16.0<\/td>\n1200<\/td>\n1350<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0<\/em>The selling price of wheat is 150\u20ac\/ton, that of maize is 150\u20ac\/ton, and that of tomato 185\u20ac\/ton.<\/em><\/p>\n

The farm area is 50 ha, and the farmer can work 1000 hours in summer and 1000 hours in winter, and has 150 tho<\/em>usand <\/em>m<\/em>3<\/em>\u00a0for irrigation<\/em>.\u00a0\u00bb<\/em><\/p>\n

\u00a0<\/em><\/p>\n

Answer the following questions :<\/strong><\/p>\n