Abstract
The terrestrial blue-green alga (cyanobacterium), Nostoc flagelliforme, was cultured in air at various levels of CO2, light and watering to see their effects on its growth. The alga showed the highest relative growth rate at the conditions of high CO2 (1500 ppm), high light regime (219-414 mu mol m(-2)s(-1)) and twice daily watering, but the lowest rate at the conditions of low light (58-114 mu mol m(-2)s(-1)) and daily twice watering. Increased watering had little effect on growth rate at 350 ppm CO2, but increased by about 70% at 1500ppm CO2 under high light conditions. It was concluded that enriched CO2 could enhance the growth of N. flagelliforme when sufficient light and water was supplied.
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