Maize Field Crops, (New March 2000) 5 Rice 5 Zea mays 5 Plant Breeding and Genetics 4 Oryza 3 Oryza sativa 3 Plant breeding 3 Sorghum 3 Wheat 3 Agriculture 2 Cassava 2 Cotton 2 Crop yield 2 Crops 2 Manihot esculenta 2 Millets 2 Pearl millet 2 Pennisetum glaucum 2 Plant Production 2 Plants 2 Potatoes 2 Solanum tuberosum 2 Agricultural Economics 1 Agricultural productivity 1 Alleles 1 Arachis hypogaea 1 Bananas 1 Barley 1 Biodiversity 1