Abstract
A bio-assay of the nitrogen which was available to two phytoplankton species with their associated bacteria in an off-shore water is described.The concentrations found by assay (11·5 and 13μg N/1.) were similar to the concentration of total inorganic nitrogen compounds found by analysis (10μg N/1.).Of the organic nitrogen normally present in solution in sea water, an insignificant quantity appears to be available to the plant-bacteria community.

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