GROWTH PERFORMANCE OF Azolla IN DIFFERENT NUTRIENT MEDIA

Two similar experiments (1^st experiment from March to May and 2^nd experiment from October to December, 2019) were conducted at the green house of Plant Breeding and Biotechnology Laboratory of Agrotechnology Discipline, Khulna University, Bangladesh to study the growth performance of Azolla in different nutrient media. The experiments were consisted of seven treatments namely TSP-20g, TSP-30g, TSP-40g, TSP-50g, TSP-20g + 1 Urea Super Granule, 1 Urea Super Granule and control (fresh water) in which 20 L water and 3 kg soil were added in each treatment. Data were collected in weekly basis (from 1^st to 4^th week) for both experiments. In 1^st experiment, no significant variation in Azolla number was observed at 1^st and 2^nd week whereas in 2^nd experiment, significant variation was observed in all the weeks. At 4^th week in both experiments, the maximum plant numbers (1629.33 and 1508.67) were observed in TSP-50g and the minimum plant numbers (145 and 2.8) were recorded in 1 Urea Super Granule. In case of plant biomass, no significant variation was observed at 1^st week in 1^st experiment and in 2^nd experiment, significant variation was observed in all the weeks. At 4^th week in both experiments, the maximum plant biomass (43.62g and 118.5g) was observed in TSP-50g and the minimum plant biomass (5.51g and 0.03g) was recorded in 1 Urea Super Granule. The total nitrogen percentage of plant was maximum (927.44% and 14.7%) in TSP-50g and the minimum (1.96% and 2.8%) was in 1 Urea Super Granule in both experiments. Considering above parameters, growth of Azolla was found better when it was grown in media containing TSP-50g with 20 L water and 3 kg soil. 

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