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Humic and fulvic acids extracted from decomposed residues of two littoral marine algae, Laminaria digitata and Fucus vesiculosus, and from mangrove leachates, stimulated the growth of a number of marine diatoms. This stimulatory effect was dependent on the concentration as well as the molecular size of the humic additive. Low molecular size fractions at low concentrations generated the maximum growth responses, as evidenced by increased cell yield, growth rate, chlorophyll concentration, and radiocarbon assimilation.
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Prakash et al. (1973) studied this question.
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