Soil microbiology is the study of organisms in soil, their functions, and how they affect soil properties. It is believed that between two and four billion years ago, the first ancient bacteria and microorganisms came about in Earth’s primitive seas. These bacteria could fix nitrogen, in time multiplied and as a result released oxygen into the atmosphere. This release of oxygen led to more advanced microorganisms. Microorganisms in soil are important because they affect the structure and fertility of different soils. Soil microorganisms can be classified as bacteria, actinomycetes, fungi, algae, and protozoa. Each of these groups has different characteristics that define the organisms and different functions in the soil it lives in. It introduces students to newly emerging field of soil biotechnology. The extensive glossary and index has been given at the end for easy study reference in understanding.
Dr. Parmeshwar Singh, Ex-principal Scientist/Professor (Agronomy) has completed his early education from Udai Pratap College, Varanasi and studied at GAC Kanpur & BAC Sabour for his B.Sc. Ag. & M.S. Ag. (Agron.) degree respectively and obtained his Ph.D. degree from APS University Rewa. He worked in ICAR project as Principal Scientist alongwith Professor and Head of Agronomy at RARS and College of Agriculture Rewa campus of Jawaharlal Nehru Krishi Vishwa Vidyalaya. His several Research Papers have been published in reputed journals and presented in International and National level conferences/symposia/workshops. He is also author of many books.