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Effects of straw application on the fertilizer needs of a sorghum/cotton rotation in North Cameroon. Gigou Jacques. 1980. In : Organic recycling in Africa : Papers presented at the FAO/SIDA workshop on the use of organic materials as fertilizers in Africa held in Buea, Cameroon, 5-14 December 1977. FAO. Rome : FAO, 186-191. (FAO Soils Bulletin, 43) ISBN 92-5-100945-7 FAO/SIDA workshop on the use of organic materials as fertilizers in Africa, Buea, Cameroun, 5 Décembre 1977/14 Décembre 1977.