The yields of the alluvial groundwater in the wadis and the intermittent aquifer systems have not yet been quantified. In total there are 218 oases, irrigated by groundwater. The whole area equipped for irrigation is irrigated all year round. The main irrigation technique used in the full or partial control irrigation schemes is surface irrigation. The major irrigated crops are sorghum, vegetables and rice.
Palm trees grow in the oases.
Le d veloppement rural en chiffres. S n gal. S n gal et du Delta. Minist re du d velopement rural et de l'environnement. 1993. Annuaire statistique des oasis.