History 349 Europe 286 Agriculture 241 Plantation crops 162 Crop improvement 147 Crop production 114 Crops 104 Horticulture 81 Plant Propagation 76 Field crops 67 Plant breeding 67 History Europe 65 History of Europe 61 Economics 60 Plant diseases 59 Plant pathology 54 E--Business, E--Commerce, ERP 53 Fruit crops 52 Field Crops 51 Biotechnology 49 Horticultural Crops, (New March 2000) 48 Plant Breeding and Genetics 47 Politics and government 46 Plant Production 44 Soil science 44 Agronomy 42 Feild crops 41 Horticultural crops 41 Philosophy 40 Vegetable crops 40