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OCEAN NUTRITION SEAWEED SELECT Green Marine Algae with Garlic extract 2 sizes    US $5.95

Sallys Seaweed Salad Green Marine Algae 10 pk    US $4.79

Ocean Nutrition Seaweed Selects Green Marine Algae Sma    US $3.49

Marine Greens Sea Algae Formula by Garden Greens 90    US $8.67

Ocean Nutrition Green Marine Algae 30g Seaweed    US $6.99

Marine Mineral Toner Sea KelpBlu Grn Algae Hyaluronic    US $16.00

Ocean Nutrition Green Marine Algae 12g Seaweed    US $2.99

HAECKEL PRINT GREEN ALGAE MARINE SEA LIFE PLANT ART NOUVEAU SIPHONEAE SEAWEED    US $33.50

Marine Green and Brown algae of the Hawaiian Islands    US $55.62

Sallys Seaweed Salad Green Marine Algae 4pk    US $3.89

Red Marine Algae by Sunny Green 60 Tabs    US $6.49

Marine Green and Brown Algae of the Hawaiian Islands Bishop Museum Bulletins in    US $88.92

Garden Greens Marine Greens Sea Algae Formula    US $10.53

Both will act as fertilizers if applied in moderate amounts.

Phosphorous is the one which is considered to be a limiting factor to growth in freshwater algae. This simply means that there's less of it availble in the environment, so it limits the rate of growth. Think of it as if you were building bicycles. You need two wheels and a set of handlebars to make a complete bike. If wheels are made at four per hour and handlebars at three per hour, you would still only be able to make two bikes per hour. You'd just have extra handlebars left over because you can make one more than is needed for the amount of wheels that can be made in the same time. If the production of wheels sped up to eight per hour, then the handlebars would be your limiting factor.

That doesn't necessarity make phosphorous more important, though, because even if it exceeds a certain level, a plant can still only grow as fast as the next element in low abundance allows it.

And you're correct that in a marine environment, nitrate is the limiting factor instead of phosphate. And one study found iron to be a limiting factor to phytoplankton: http://www.riverdeep.net/current/2000/11/111300t_plankton.jhtml

So much depends on the environment in which the algae lives.

Marine Algal Blooms as Renewable Fuel Sources