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Based on this comment, you are overlooking the fact that high levels of PO4 will inhibit calcification in corals and other Ca-consuming organisms (Coralline for example).
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Yes, we also have to consider (thanks Cosmic for reminding me)that but I guess my ultimate concern regards toxicity and nitrogenous wastes are toxic and can immediatly impact our system's inhabitants whereas PO4 can only hinder their growth.
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Advanced seaweed biology books usually have a whole chapter on each. As far as concentration Carbon by far out weighs Phosphorus. The ratio of C in seaweeds, to that in water is 1.0 x 10-4 and P is 2.4 x 10-5. They are both part of Liebig's Law of Minimum, as are other nutrients. That avg ratio of C:P in seaweeds is almost 100 : 1 (97.86 : 1)or 274, 000 ug / g-l C and 2,800 ug /g-l P
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I could be wrong but I think this ratio holds for most terrestrial plants as well. What is amazing is how very little phosphate can greatly increase growth rates (or at least from what I have read). And then there was the whole fiasco with phosphates and the Great Lakes...
Take er easy
Scott T.