Growth, water content and chemical composition of Azolla pinnata R.Br. in relation to acidity [Bangladesh].
1993
Islam A.K.M.N.
Dry weight, water content and chemical composition of Azolla pinnata collected from a range of natural aquatic habitats were studied. Dry weight per plant ranged from 0.53 to 1.04 mg and water content varied from 84.6 to 93.3%. Azolla pinnata grown under natural light at three pH levels (4.5; 6.5 and 7.5) in water culture experiment showed that the increasing ph levels caused a decrease in Azolla growth. Growth of the plants was best at ph 4.5 and worse at 7.5 suggesting that these plants grow better under acidic condition. The chemical analysis of plants collected from various natural aquatic habitats showed very high calcium and potassium accumulation followed by phosphorus and nitrogen. Plants grown at pH 4.5 contained 3 and 2 times more phosphorus than those grown at pH 6.5 and natural aquatic habitats respectively.
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