This document provides information on biofertilizers. It begins by defining biofertilizers as nutrient inputs of biological origin that promote plant growth. It then lists and describes various types of biofertilizers including nitrogen fixers (Rhizobium, Azospirillum), phosphate solubilizers (Azotobacter, Pseudomonas), and green manures (Azolla, mycorrhizae). The document also discusses the benefits of biofertilizers, how they are isolated and mass cultivated, and their application in agriculture. It concludes by listing the commercial producers and costs of various biofertilizers in India.