TY - BK TI - Cereal technology development- West African semi-arid tropics: A farming systems perspective U1 - 338.1096 PY - 1986/// CY - West Lafayette, IN (USA) PB - Purdue University, KW - Appropriate technology KW - Cereals KW - AGROVOC KW - Constraints KW - Extension activities KW - Food policies KW - Management KW - Methods KW - Production KW - Research KW - Semiarid zones KW - Water retention KW - West Africa KW - Soil fertility KW - Farming systems N1 - Illustrations, tables, references p. 69-76, appendices ER -