Plant Cropping Systems 31 Plant Production 15 Cropping systems 12 Field Crops, (New March 2000) 10 Plant Breeding and Genetics 10 Sustainability 10 Agricultural Economics 8 more ... Crop production 8 Plant Pests, (New March 2000) 8 Plant diseases 8 Organic farming 7 Plant Physiology and Biochemistry 7 Plant pests 7 Taxonomy 7 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 7 Crop Produce 6 Environmental Tolerance of Plants 6 Horticultural Crops, (New March 2000) 6 Soil Fertility 6 Crops 5 Meteorology and Climate 5 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 5 Plant breeding 5 Social Psychology and Social Anthropology, (New March 2000) 5 Soil fertility 5 Stress 5 Taxonomy and Evolution 5 Tropics 5 Adaptation 4 Agriculture 4 less ...