A socio-economic survey of minor irrigation in the dry zone of Sri Lanka [rice]

affectation de ressources agricultura de regadio arroz arroz irrigado asia asie cereales cereals clima climat climate climatic zones condiciones ambientales condition de milieu cropping systems crops cultivos cultivos de grano desarrollo de recursos economic plants economic sociology environment environmental conditions environnement farm inputs grain crops income ingresos insumos agricolas irrigated farming irrigated rice land use medio ambiente moyen de production agricole plantas plante plante de culture plants resource allocation resource development revenu rice riz sistemas de cultivo site factors sociologia sociologia economica sociologie sociology sri lanka utilisation du sol zone climatique