Fertilizers and other Amendments Plant Production 13 Fertilizers 10 Horticultural Crops, (New March 2000) 9 Crop production 8 Plant Nutrition 8 Plant Physiology and Biochemistry 8 more ... Crop Produce 7 Plant Pests, (New March 2000) 7 Plant pests 7 Plant diseases 6 Plant nutrition 6 Soil Water Management (Irrigation and Drainage), (Revised June 2002) 6 Field Crops, (New March 2000) 5 Irrigation 5 Nitrogen 5 Organic farming 5 Plant Breeding and Genetics 5 Plant protection 5 Soil Fertility 5 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 5 Food Composition and Quality 4 Insect pests 4 Plant Cropping Systems 4 Plant pathogens 4 Plant physiology 4 Soil Chemistry and Mineralogy 4 Agricultural Economics 3 Chemical composition 3 Crop establishment 3 less ...