Nice thread, I've been doing some reading on this rhizotonic stuff...it's expensive but sounds like a worthwhile investment. I wonder if it speeds up clone rooting as well?.
"RHIZOTONIC adds more than 60 microbiological substances that considerably speeds up the growth of a balanced root environment. Various trace elements and vitamins such as B1&B2 have been added to RHIZOTONIC in to stimulate the plant production of hormones and root growth, thus providing better and stronger roots."