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Zone semi-aride --- Semiarid zones --- Agriculture --- agriculture --- Conservation des sols --- Soil conservation --- Conservation de l'eau --- Water conservation --- Utilisation de l'eau --- Water use --- Céréale --- Cereals --- Légumineuse --- Legumes --- Sécheresse --- Drought --- Aridoculture --- Dry farming --- Afrique --- Africa --- Afrique occidentale --- West Africa --- -Dryland farming --- Farming, Dry --- Rainfed agriculture --- Arid regions agriculture --- Tillage --- Deserts --- Basic Sciences. Agriculture --- Agricultural Systems --- Farming Systems --- -Deserts --- Agriculture. --- Farming Systems. --- Dryland farming --- agriculture. --- Cta