phosphorus-nitrogen ratio

phosphorus-nitrogen ratio

[′fäs·fə·rəs ′nī·trə·jən ′rā·shō]
(oceanography)
The proportion, by weight, of phosphorus to nitrogen in seawater or in plankton; the ratio is approximately 7:1.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.