The book Applied Microbiology constitutes seven chapters which are subdivided into many subtopics. The topic Soil Microbiology being vast, it divided as the Introduction to soil microbiology and Elemental transformations in soil. The subsequent chapters include Microbiology of Water, Sewage, Milk and milk products, Food and Air. Features of this book are Chapter index, Subject index, Chapter outline and Summary, Questions, Literature list for further reading, Figures and Photographs which will facilitate the readers to refer the book. This book also deals with the basic information about the practicals conducted in the field of applied microbiology.