Which thread at THC Farmer are you taking this from? Although there are only a handfull of posts in the section, I'm not going to spend an hour looking for the reference, lol.
I take it you've watched this:
YouTube - THC, UVB and Me
If I remember correctly, he talks abvout CBN, CBD and THC ratios, as it pertains to cannabis' psychotropic effects. But other than watching your trichome maturity...I'm not sue if there's a CBD 'growth suppliment' to promote couchlock. (sedative/pain relief effects)