Potentiality of azolla in rice and fish culture system

The present work intended to study the potentiality of Azolla as a bio-fertilizer and as fish feed in a paddy cum fish culture unit. Results of three years study clearly showed in all replicatio and combination best performance was achieved in T3 (Azolla incorporation before and 50 days after transplanting). Puntius gonionotus (Thaiputi) and Oreochromis niloticus (Tilapia) both obtained their highest values of average weight and length in case of T3. The highest value of absolute growth and relative growth were always found in T3. Highest yield of Thaiputi and Tilapia were recorded in T3. Maximum total yield 6533 kg/ha, 7774 kg/ha and 8213 kg/ha were obtained from T3 after 360 days in 1st, 2nd and 3rd year. Straw yield due to T2 and T3 were significantly higher than T1 treated plot (T1-5026.5, 5337.5, 6097.5 kg/ha) and the highest straw yield was obtained from T3 treated plot in 1st and 2nd year (T3- 7196.3, 6105 and 7622.5 kg/ha) and T2 in 3rd year (T2 –600.95, 548 and 885.75kg/ha). Grain yield of BR-2 variety significantly varied (T1-4462.5, 4745, 4510 and T2- 5120, 5600, 5882.5 kg/ha). The highest grain yield of BR-2 variety (5405 kg/ha, 5970 kg/ha, 6379 kg/ha) was obtained with the treatment of T3.