Sustainable agricultural development in the dry areas of West Asia and North Africa. Report based on a seminar on natural resources and environmental management

afrique du nord agricultural development arid zones aridoculture australia australie ayuda al desarrollo cultivo de temporal culture pluviale desarrollo regional desertification development aid development plans dry farming environmental policies extension extension activities farming systems financial policies information services instituciones sociales institution sociale investment policies japan japon land management land resources middle east moyen orient natural resources north africa oriente medio planes de desarrollo politique de l'environnement politique des investissements production possibilities rainfed farming recursos de la tierra recursos naturales regional development ressource en eau ressource naturelle riego complementario service d'information social institutions socioeconomic development socioeconomic organization sostenibilidad supplemental irrigation sustainability vulgarisation water resources zone aride