(i) Paddy field: Paddy crop is grown in field where aquatic condition persists for several weeks . Under such conditions, the best biofertillizer is Azolla-Anabaena symbiosis. It is usually inoculated at the rate of 300-500kg fresh weight per hectare of land about a mouth before rice planation.
(ii) Wheat field: Wheat is grows in terrestrial condition Thus, the best biofertillizer is free-living nitrogen fixing bacteria-Azotobacter chroococcum and Azospirillum lipoferum. Azospirillum grows is Bacillus cereus and Azotobacter chroococcum. These are free living `N_(2)` fixing bacteria and enhance the fertility of soil.
