Bio-fertilizers are the organic substances which make use of microorganisms to increase the fertility of soil. These fertilizers are not harmful to crops or other plants like the chemical fertilizers. They are actually taken from the animal wastes along with the microbial mixtures. Microorganisms are used to increase the level of nutrients in the plants. They let the plants grow in a healthy environment. Mycorrhizal plants exhibit greater uptake of phosphorus and trace elements when these nutrients are sparingly soluble in soils (Powell and Bagyaraj, 1984; Abbot et al., 1992). They can also show improved resistance to drought, environmental stress and also fight against the root borne pathogens (Allen and Boosalis, 1983).