Bio-Fertilizers are natural fertilizers which are microbial inoculants of bacteria, algae, fungi alone or in combination and they augment the availability of nutrients to the plants. The use of bio-fertilizers, in preference to chemical fertilizers, offers economic and ecological benefits by way of soil health and fertility to farmers. In view of the immense potential of bio-fertilizer technology covers all major types of bacterial fertilizers. This book will be of use and interest to consultants, researchers, libraries, entrepreneurs, manufacturers of bio-fertilizer and for those who wants to venture in to this field.