Fertility of savanna soils and cultivation system in the Central African Republic. Nutritional potential of food crops in savanna areas of the Central African Republic

agricultura tradicional agriculture traditionnelle besoin nutritionnel central african republic draught animal cultivation exploitation agricole familiale family farms food production labour main d'oeuvre mano de obra manpower necesidades de nutrientes nutritional requirements nutritive value production alimentaire productividad productivity rotation culturale rotational cropping trabajo traditional farming travail valeur nutritive valor nutritivo