1. Soil Biota
2. Soil Microorganisms
3. Microbial Interactions
4. Interactions Among Soil Organisms
5. Soil Organic Matter and its Pool in Soil
6. Biodegradation of Soil Organic Matter and Crop Residues
7. Soil Humus and its Formation
8. Microbial Transformation
9. Biotic Factors in Soil Formation
10. Soil Enzymes
11. Production of Manures from Organic Waste
12. Organic Waste & their Use in Production of Biogas and Manure
13. Clay Organic Matter Complexes