Fertilizers Fertilizers and other Amendments 10 Plant Production 9 Crop production 6 Horticultural Crops, (New March 2000) 6 Crop Produce 5 Irrigation 5 more ... Plant pests 5 Soil Water Management (Irrigation and Drainage), (Revised June 2002) 5 Agricultural Economics 4 Organic farming 4 Plant Nutrition 4 Plant Pests, (New March 2000) 4 Plant Physiology and Biochemistry 4 Plant diseases 4 Plant nutrition 4 Agriculture 3 Field Crops, (New March 2000) 3 Nutrient deficiencies 3 Plant Breeding and Genetics 3 Plant Cropping Systems 3 Plant pathogens 3 Plant protection 3 Protected cultivation 3 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 3 Agricultural and Forestry Equipment (General) 2 Chemical composition 2 Crop establishment 2 Crop quality 2 Crop yield 2 less ...