STUDIES ON THE MASS CULTURE OF PHAEODACTYLUM. IV. PRODUCTION AND NUTRIENT UTILIZATION IN OUTDOOR MASS CULTURE

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Abstract
Estimates of the organic production by mass cultures of Phaeodactylum grown in outdoor tanks have been made from changes in the packed volume of the cells in culture, from oxygen bottle experiments, from change in the inorganic phosphate content of the medium, and by harvesting the cells. The results confirm the validity of comparisons upon which production estimates in earlier series of experiments were based. Harvested cells have been analyzed and the bulk constituents found not to vary greatly in spite of variation in the growth rate and in size of cell. Phosphorus balances made at the beginning and end of each period of culture show that the efficiency of incorporation of added nutrients into the cell is high.