Hey there, I'm still quite "green" when it comes to autos am d I grow them in hydroponics. I've always added the needed nutrients and change weekly with a fresh batch. I noticed your growing in soil and I belive the feed regiment is alot less as the nutrients stay in the soil. I would advise using nutrients that are designed specifically for soil grows. Usually with my outdoor grows I feed about every 2 weeks or so.
Hope this helps!
Cheers!