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A Russian study showed that seedlings with at least 4" of soil to grow the tap root were more likely to go female. The source I am quoting says "This may be why some farmers get female/male ratios as great as 80%/20%."
Source:
http://www.cannabis-seed-banks.com/transplanting-cannabis.html
Source:
http://www.cannabis-seed-banks.com/transplanting-cannabis.html