Wheat Rice 9 Barley 4 Maize 3 Sorghum 3 Crop improvement 2 Field Crops, (New March 2000) 2 Hordeum vulgare 2 Pearl millet 2 Plant Breeding and Genetics 2 Plant breeding 2 Triticum 2 Triticum aestivum 2 Agricultural Economics 1 Agricultural innovations 1 Agricultural prices 1 Agricultural productivity 1 Agriculture 1 Amplified fragment length polymorphism 1 Arachis hypogaea 1 Biological Resources (Plant) 1 Biology 1 Biotechnology (General), (Revised June 2002) 1 Botany Cultivation 1 CGIAR 1 Cassava 1 Characterization 1 Colocasia esculenta 1 Cotton 1 Crop yield 1