Soil Water Management (Irrigation and Drainage), (Revised June 2002) 23 Irrigation 17 Plant Production 13 Water management 13 Water Resources 9 Crop production 8 Horticultural Crops, (New March 2000) 8 more ... Plant pests 7 Agricultural Economics 6 Crop Produce 6 Fertilizers and other Amendments 6 Natural Resource Economics, (New March 2000) 6 Plant Breeding and Genetics 6 Plant Pests, (New March 2000) 6 Plant Physiology and Biochemistry 6 Fertilizers 5 Food Storage and Preservation 5 Plant Nutrition 5 Plant Water Relations 5 Plant diseases 5 Plant physiology 5 Viral, Bacterial and Fungal Diseases of Plants, (New March 2000) 5 Crop management 4 Crop yield 4 Drainage 4 Insect pests 4 Irrigation systems 4 Irrigation water 4 Management 4 Meteorology and Climate 4 less ...