Nitrogen fixation Soil Biology 5 Nitrogen fixing bacteria 3 Plants 3 Trees 3 Woody plants 3 hydraulic conductivity 3 Agroforestry 2 Agroforestry and Multipurpose Trees: Community, Farm and Social Forestry 2 Biochemistry and Physiology of Microorganisms, (New March 2000) 2 Cropping systems 2 Crops 2 Denitrification 2 Ecological pest management 2 Field Crops, (New March 2000) 2 Forage and Fodder Crops, (New March 2000) 2 Forests and Forest Trees (Biology and Ecology) 2 Genetics and Molecular Biology of Microorganisms, (New March 2000) 2 IN-SITU Manuring 2 Microorganisms 2 Molecular Biology and Molecular Genetics, (Discontinued March 2000, Reinstated and Revised June 2002) 2 Mycorrhizal fungi 2 Mycorrhizas 2 Nitrification 2 Nitrogen 2 Nitrogen fixing trees 2 Nodulation 2 Plant Cropping Systems 2 Plant Nutrition 2 Plant Production 2