Development (2) Agriculture (2) Agronomy (2) Sustainable agriculture (2) Planning (2) Irrigation (2) puits (1) conservation de l'eau (1) vitesse (1) sol (1) planification (1) irrigation (1) effet (1) science économique (1) agriculture (1) culture (1) droits (1) agronomie (1) Yémen (1) Centre (1) Feeding and feeds (1) Employment (1) Law and legislation (1) Nineteen seventies (1) June (Month) (1) Rooms (1) Yemenis (1) Alternative agriculture (1) Technique (1) Water conservation (1)