I was wondering if anyone knows if compressed clay " hydroton " would give the attachment needed for Microbial Rhizosphere Colonization.
http://jxb.oxfordjournals.org/cgi/co...ll/56/417/1761

Not really.. The moisture levels aren't at all stable, and they'd be lacking alot of more complex stuff found in soil.. Hydroponic nutes are designed to be bioavailable in a sterile environment.. And then there are enzymes you can add that compensate for the lack of microbial life..
The reason hydroponic target pH is lower than soil is because of the lack of a rhizosphere per se too.. As you get closer to the roots in healthy soil, the pH drops because thats where these things are most concentrated, and they tend to produce acidic byproducts..

Thanks for the response.. any specific bioavailable enzymes that can promote growth and or fruiting.... when you say Sterile Environment meaning cleaning reservoirs, medium, trays etc or water ie reverse osmosis water.... Is it true that reverse osmosis water helps plants uptake nutes more efficintenlty .. can you get the same results with boiling water...

If your water is hard, or has something in it that plants don't like then RO water will help alot.. If your water is fine then it won't help much.. Rainwater is probably my favorite, but my tapwater was always fine too.. If you want to eliminate chlorine, first you need to find out if your city adds chlorine or chloramine.. If its chlorine then it will dissipate if you just let it sit for a day or so(faster in sunlight).. Algae won't grow noticably in clean water.. If its chloramine then thats more complicated.. Pet stores carry products, but I don't know whats safe with plants for sure..
I said sterile because thats usually a theoretical goal of hydroponics.. The cleaner the better, but you don't need to treat it like you're going to perform surgery or anything.. You can do ALOT towards keeping your res and lines clean by just keeping light out.. Algae love to grow when they get light..
As for the enzymes, I don't have any personal experience with the current products.. There are alot, and alot of threads on them..