yeah I was gonna say, source some peat moss, high quality compost or worm castings, perlite and some amendments (eg rock dust, alfalfa meal,...) and mix your organic growing medium. the organic subforum on grasscity has some good tutorials I think. compost and a living growing medium has the advantage of buffering the pH as well as the nutrients being available to the plant. with inorganic fertilizers, it is far easier to do too much.
PS: in my opinion, drugmentor, allthough seeming to be pretty knowledable on growing pot, most probably more than I am, they got one thing wrong in my opinion: N deficiency will show at the lower leaves first, because the plant is relocating nitrogen from the lower leaves to the higher canopy, where it is more of use to the plant to create leaves to do photosynthesis.