TY - BK AU - Anderson,J.R. AU - Hazell,P.B.R. TI - Variability in grain yields: Implications for agricultural research and policy in developing countries SN - 0-8018-3793-6 U1 - 338.17311091724 PY - 1989/// CY - Baltimore, MD (USA) PB - Johns Hopkins University|IFPRI, KW - Analysis KW - Barley KW - Chemical resistance KW - Climate KW - Crop yield KW - AGROVOC KW - Cropping systems KW - Developing Countries KW - Food production KW - Fungicides KW - Genetic variation KW - Germplasm KW - Grain crops KW - High-yielding varieties KW - PENNISETUM TYPHOIDES KW - Pest resistance KW - Rice KW - Spring crops KW - Trade KW - Trade policies KW - Varieties KW - Winter crops KW - Food security KW - Triticum aestivum KW - Wheat KW - Yields KW - Nitrogen fertilizers KW - Hybrids KW - Plant breeding KW - Farming systems N1 - Tables, graphs, maps, references p. 357-380, contributors p. 381-384, index p. 385-395 ER -