Growth and nitrogen fixation of azolla
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Date
1987
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Kerala Agricultural University
Abstract
Among the six azolla cultures studied A. microphylla (Galapagos Islands)
and Azolla sp. (Brazil) have recorded maximum growth rate. The highest
nitrogenase activity was recorded in A. filiculoides (Italy) followed by Azolla sp.
(Brazil). Nitrogen content was also more in these two spacies of Azolla. The
chlorophyll 'a'accumulation was significantly more in Azolla sp. (Brazil) whereas
chlorophyll 'b'was more in Azolla sp. (Paraguay). Azolla sp. (Brazil) has also
registered higher GS, GDH and GOGAT activities followed by Azolla sp. (Paraguay)
Ammonia excretion was found to be maximum on 15th day after inoculation in
A. mexicana (California) followed by A. microphylla (Galapagos islands). The
micronutrients status of Mn, Cu, Fe and Zn was investigated and iron content was
significantly more in all the azolla cultures. Iron content was maximum in
A. pinnata (Coimbatore) while A. mexicana (California) has recorded higher Mn
content. A. filiculoidas (Italy) has recorded higher Cu and Zn contents. In
general, it was noticed that the accumulation of Cu, Fe and Zn was relatively
more in A. filiculoides (Italy) compared to other cultures.
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Citation
Agricultural Research Journal of Kerala, 25(1), 89-98.