Humboldt makes nutrients for all types of systems, whether it be soil, hydro, aero, etc..... I use their g/m/b 8 week moderate feeding schedule. Their nutrients are expensive, but I get 4oz plants and 2 Lbs per light. I cant complain. That's also why I dont subscribe to Lucas's methods. His formulas emphasise a proper grow environment and limited nutrients. He's against additives because he doesnt and hasnt used them. That's just stupidity in my book....... The only money pits in Humboldt products are Big Up Powder, White Widow powder, and their ProZyme. The ProZyme used to be a heavy use product (sometimes 20mL/gallon in week 6!) but they just redesigned their feeding and nutrients so its using on average 5mL/gallon and the white widow/big up are only either veg or three times during flowering.
I'd like to add up how much $ I spend in nutrients per harvest, I think its probably around $300-$400. When you get 32oz a light, woopiedoodoo at the cost of nutrients! BUY THE BEST!
I have zero experience with soil, so I cant offer any valid opinion.....