Cropping systems 25 Plant Cropping Systems 20 Organic farming 10 Plant Production 10 Soil fertility-fertilizers 10 Cropping system 8 Field Crops, (New March 2000) 8 soil management-cropping systems 8 Crop production 7 Soil fertility- Fertilizers 7 Plant Breeding and Genetics 6 Plant Physiology and Biochemistry 6 Sustainability 6 Agricultural Economics 5 Agriculture 5 Plant Pests, (New March 2000) 5 Plant diseases 5 Rice and rice based cropping system 5 Soil management- Cropping systems 5 Taxonomy 5 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 5 CROPPING SYSTEMS 4 Coconut and coconut based cropping system 4 Crops 4 Farming systems 4 Forage and Fodder Crops, (New March 2000) 4 Plant breeding 4 Plant pests 4 Post harvest technology 4 Social Psychology and Social Anthropology, (New March 2000) 4