Complete guide covering cyanobacteria characteristics (oxygenic photosynthetic prokaryotes), isolation methods from freshwater/soil using BG-11 medium, morphological identification, maintenance protocols, mass cultivation techniques (trough method, pit method, field-scale 40m², nursery-cum-algal production), harvesting procedures (10-30 kg/40m²), and field application recommendations (10-15 kg/ha) for biofertilizer production.