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Re: [APD] plants and the nitrogen cycle

I do not know off hand where in her book Ms. Walstad discusses this, but she 
did write a detailed article about the subject, with LOTS of data: she cites 
studies, tests, and references other material on the subject.

You can find the complete article with tables and graphs and all the info 
you desire here on my WEB site.

http://www.aquabotanic.com/plants_and_biological_filtration.htm How much 
more data do you want Robert? :)

Robert Paul Hudson

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