Plant nutrition Plant Nutrition 9 Plant Production 8 Animal nutrition 6 Biochemicals 6 Biochemistry 6 Crop production 6 Gene 6 Plant Pests, (New March 2000) 6 Plant pests 6 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 6 Crop Produce 5 Horticultural Crops, (New March 2000) 5 Mixed fertilizers 5 Plant Breeding and Genetics 5 Plant Physiology and Biochemistry 5 Plant disease control 5 Plant diseases 5 Soil Fertility 5 Taxonomy 5 organic manures 5 Cultivars 4 Fruits 4 Nutrient deficiencies 4 Nutrient uptake 4 Pathogen, Pest, Parasite and Weed Management (General) 4 Pest control 4 Phosphorus 4 Plant Disorders and Injuries (Not caused directly by Organisms) 4 Plant Propagation 4