North west land and water resources development project [Vanathavillu colonization scheme, dry zone, Sri Lanka]

asia asie bombas clima climat climate climatic zones condiciones ambientales condition de milieu crops cultivation cultivo cultivos drainage equipment economic plants economic sociology environment environmental conditions environnement equipment equipo equipo de drenaje equipo de riego irrigation irrigation equipment machine machinery maquinaria medio ambiente methode methods plantas plante plante de culture plants pompe pratique culturale pumps riego site factors sociologia sociologia economica sociologie sociology zone climatique zone semi-aride