Biofertilizers are live or latent microbes which on inocculation increase their number in soil or in roots and carry out nutrition enhancement either by fixing atmospheric nitrogen or by dissolving phosphate aur bhai security micronutrients etc. Their number gradually increase in soil and continue to help them maintain fertility of the soil..NPK on the other hand is a chemical mixture of chemical fertilizers. It serves only limited purpose of supplying a particular type of Nutrition & and for a specific duration and purpose. It's not multi purpose in nature. Its discourage growth and development of indigenous microflora. Excessive use of it destroy the natural biological properties of soil.
Example of bio fertilizerfertilizer:
Rhizobium:
Rhizobium is a symbiotic nitrogen fixing bacteria live in Association with the roots of legumes. Cultivations of legume therefore increase nitrogen content of the soil. Its practice to cultivate legumes as intercrop between major crops. Its there for a kind of bio Fertilizer and can be inoculated artificially while cropping legumes.
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