http://www.softsecrets.nl/_public/SSUK2007-03.pdf
Check out this pdf please, this question is buggin the shit out of me now.
If you were to take the word of any grower in the world, who would you chose, how many would take Ed Rosenthal's word over most others?
Page 60-62 of the pdf is an ask Ed column please please please check it out.