[Research on rice in Casamance in Senegal. Amelioration of rice. Activity report 1981-82]

africa africa de habla francesa africa south of sahara afrique afrique au sud du sahara afrique francophone afrique occidentale agronomic characters arroz arroz de secano biological control breeding breeding aims breeding methods cereales cereals crops cultivos cultivos de grano drought resistance economic plants essai francophone africa grain crops hybridation hybridizing lutte biologique methode methods objetivo de mejoramiento pest control methods pest resistance plantas plante plante de culture plants pruebas recherche research resistance to injurious factors resistencia a las plagas rice riz riz de montagne selection trials upland rice west africa