Food self-sufficiency and food security: a case study of agricucltural production for food security in Wollaita, Southern Ethiopia

agropastoral systems autosuffisance autosuficiencia basic needs besoin fondamental besoin nutritionnel derecho de uso estado nutricional ethiopia etiopia facteur de production farmland food production food security food supply hogares households land policies land productivity mathematical models necesidades de nutrientes nutritional requirements nutritional status pobreza poverty production alimentaire production factors productividad de la tierra right of access rural areas seguridad alimentaria suministro de alimentos terre agricole zonas rurales zone rurale