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A few months ago there was a thread about someone that had come up with
research/theory supporting a fixed ratio of N-P-K that plants needed.  The
study is also mentioned in Walstad's book "The Ecology of the Planted
Aquarium."  I am trying to find the thread in the archives, and I have
looked all through Diana's book and cannot find it.  Does anyone remember
what I am talking about?  Something about critical ratios maybe?

Ben in SW Virginia
(anyone else out here?)