Abstract
This research aims to know the effect of CO2 induction to growth of fresh water microalgal cell of Ankistrodesmus sp. Microalgal culture was carried out by means of laboratory scale on Erlenmeyer tube containing Basal Bold Medium (BBM). The experiment design was completely randomized design in single factor with 3 levels: CO2 induction, air induction and control (without treatment). The growth of Ankistrodesmus sp cell with air induction treatment was reach growth peak same as control at the 11th day with cell density 1.063.166 cell.ml-1 and control 385.833 cell.ml-1. Two peak of growth was occurred in CO2 induction treatment, at the 9th day with cell density 772.793 cell.ml-1 and the 13th day with cell density 436.888 cell.ml-1. The optimum growth of rate Ankistrodesmussp cell in CO2 induction treatment was 1.59 cell division.day-1 at the 6.87th day, in air induction 1.49 cell division.day-1 at the 7.69th day and control 1.05 cell division.day-1 at the 3.96th day. In the end observation, pH of culture medium in CO2 induction treatment was reach 9.1, in air induction treatment 8.3 and control 7.6. The highest biomass of Ankistrodesmus sp cell was occurred in CO2 induction treatment 2.4 g.l-1, followed by air induction treatment 2.1 g.l-1 and control 1.6 g.l-1. The highest chlorophyll consentration of Ankistrodesmus sp cell in CO2 induction treatment 10.70 mg.l-1 followed by air induction teatment 10.57 mg.l-1 and control 7.84 mg.l-1.