Plant Cropping Systems Plant Production 10 Cropping systems 8 Field Crops, (New March 2000) 8 Crop production 6 Organic farming 6 Plant Breeding and Genetics 6 Plant Physiology and Biochemistry 6 Sustainability 6 Agricultural Economics 5 Plant Pests, (New March 2000) 5 Plant diseases 5 Taxonomy 5 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 5 Forage and Fodder Crops, (New March 2000) 4 Plant breeding 4 Plant pests 4 Social Psychology and Social Anthropology, (New March 2000) 4 Soil Fertility 4 Taxonomy and Evolution 4 Animal Husbandry and Production, (New March 2000) 3 Biological Control 3 Biological Resources (Plant) 3 Biological control 3 Biological control agents 3 Biotechnology 3 Crop Produce 3 Crops 3 Environmental Pest Management 3 Fertilizers and other Amendments 3