If you use chemical nutrients in Organic soil you will lose the organic aspect of the grow as I believe orange is correct. They will kill off your micro herd. This won't be a problem provided you continue to feed them and make sure your ph is between 6.3-6.8. When you grow all organic the herd does the work breaking down nutrients and your ph is less important. Once you kill the herd you need to maintain proper ph for proper nutrient uptake. Jmo
Roots is a good line, but don't get sucked into buy all of them. If your in FFOF then you have 5 weeks of nutes in there. At that time you will need to add some N. You have some time to look around at ingredients and see what you could do for less money then the whole line of anything. Molasses...check out the teas thread in organics.. Lots of good info.
In my opinion you won't be sorry to learn all you can about good organics.