Abstract
A field experiment was conducted and studied the effect of nitrogen and phosphorus on ammonia assimilating enzymes of Azolla. Nitrogen and phosphorus at 30 and 60 kg/ha respectively were tested andAzolla pinnata was inoculated at 200 g/m2. The Azolla samples were drawn on 24th hr, 7th day and 14th day and the ammonia assimilating enzymes glutamine synthetase (GS), glutamate synthase (GOGAT) and glutamine dehydrogenase (GDH) were estimated. Nitrogen and phosphorus have markedly suppressed the GDH activity but fertilizer nitrogen has no significant influence in inhibiting the enzyme activity of GOGAT and GS. In general phosphorus application also has stimulated the GS activity significantly during the first sampling period of 24th hour.
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