Also NAA may be available. Two other products I have tried, not in lab situation, were Growth Plus (AKA Nitrozyme, Active:Cytokinin 400ppm) and Ultimate Thrive (Vitamin B-1, food grade) have had mixed and varied results. http://www.treesearch.fs.fed.us/pubs/4952 -- NAA link http://www.agriorganics.com/agriculture.php?Pid=1 --- growth plus link http://www.supernaturalbrand.com/specialty.htm --- scroll down for the details on Ultimate Thrive