Just ordered this book.

[Marconis]

Highly recommended by the people at FishTankTV, and highly recommended on various planted sites. Very excited for it.

Amazon.com: Ecology of the Planted Aquarium: A Practical Manual and Scientific Treatise for the Home Aquarist, Second Edition (9780967377315): Diana L. Walstad: Books

Maybe it'll interest you as well. I've been hunting for a more scientific-minded book for the hobby. Should be a great read.
I think I've taken a (highly)pseudo-Walstad method approach with dirt, so I'm pumped to see what her "El Natural" idea is all about.

 

[ChizerBunoi]

It is a really great book to read. You can get support from her directly too on another plant forum.

 

[Marconis]

You know, I just registered there today and posted my tank in the "El Natural" sub-forum. Hoping to learn a lot, it seems like a great community.