This is my first grow and I am growing organic using EJ Amazon Bloom soil(added 40% perlite) and EJ sweet and heavy line of nutes. This is whats in the soil: Contains: peat moss, forest compost, coconut coir, feather meal, bat guano, marinebird fossilized guano, steamed bone meal, sulfate of potash magnesia from langbenite, neem meal, earthworm castings, sea kelp (ascophyllum nodosum), humate ore (leonardite) yucca meal, oyster shell lime. The recommended companion to the Earth Juice line of fertilizers. With all that good stuff in it, even though i don't know how much of each, when would I need to start adding the nutes to them. Oh yea the clones are of cheese and I have had them for almost a week but they came good sized.
keep in mind, that is just a guess. if you bolster your soil with microbes/microbe food with a well balanced AACT once or twice it'll probably last throughout the whole grow