Rice Wheat 9 Oryza sativa 7 Field Crops, (New March 2000) 6 Oryza 6 Maize 5 Agriculture 4 Sorghum 4 Vegetables 4 Cereals 3 Cotton 3 Crops 3 Dissertations, Academic (Ph.D) 3 Field crops 3 Horticultural Crops, (New March 2000) 3 Plant Production 3 Plants 3 Zea mays 3 Agroforestry 2 Arachis hypogaea 2 Azolla 2 Crop yield 2 Cropping systems 2 Cultivation 2 Fabaceae 2 Gossypium 2 Groundnuts 2 Hybrid rice 2 India 2 Legumes 2