Tobi also stated K+ stunting the plants, this is not true at all, plant need K+ more than any other things, IMO it should be always higher, least 3 times higher than the Nitrogen. Tobi also have taken out Urea from his fert, while i think Urea is the main player here for fast plant growth.
am not working with Tobi's fert or trying to modify it, this is not even related to his fert at all, am working on this fert based on the research i been doing on plants, how they respond to differnt sources of nitrates etc.
someone told me to use Mg sulfate and Ca sulfate to get same results but IMO it have soulibilty issue when adding in the solution, Mg and Ca nitrate were the only good source to work with. its not only the nitrate which is important here, but Mg and Ca are more important.