Nutrients are nutrients. The ones you bought are designed for hydoponic use. That means those nutes will be the ONLY food they get if you were growing hydroponically. Since you are using soil, I'm sure the soil has some nutrients in it. So, when you read the directions on the bottle, test it in a VERY WEAK concentration. If it says 5 oz of nutes to a gallon, just use 1 oz (OR LESS) with a gallon, and watch your plants. If they like it, you can add a bit per gallon. Your biggest danger is over feeding and burning the plants.

wallhofen