Go to Sid's site... http://www.geocities.com/quickgrowguide/ That's where I learned everything I need to know.
dunno what that growguide has on ferts..but i'll help ya out... first 2-3 weeks of growing, the plant needs/wants no fertalizer. after that, some 10-10-10 fert is perfect, not too often though. then when flowering begins, use 10-60-10 fertilizer, as marijuana needs the phospherus when flowering.