im getting confused also, haha. the soil i use is almost inert, with very little fertiliser in it, just enough to care for baby stage, with my soil you see when the girls want to feed. this is what i use, read, google and compare, the choice is yours..
veg stage...plagron.terra grow........5ml per litre just that til the flip
flowering stage..plagron terra bloom (basic bloom nutes), use this till sex or preflowers are visible
canadien express ..regen-a-root.. 1ml per litre..(keeps roots strong and helps prevent disease)stop at week 7
canadien express..superior potash..1ml per litre..(increases weight and size of flower) stop at week 6
canadien express..head-master..1ml per litre..(super flower enhancer) stop at week 6
growtec..monster bloom..6grammes per 19litres, calculater prob req..stop at week 6
house and garden van de zwaan..bud xl..1ml pr litre..(sugar transporter v.good) start at week 6 til end
i also just water with mollassess for the last week on its own, add all ingredients one at a time to water left out for 24hrs, ph the solution with a pen or liquid test kit, and bob should be your uncle..he is mine.. its really confusing in the beginning but that is what i use and do, and im laughing, there maybe others on this site that dissagree with me but im only a newbie myself with only 3 harvests behing me, but every one has been very good quality and quantity.. my last two girls gifted me 18.5 ounces of prime bud, the talk of the town..
hope that helps.. good luck, free to answer any more...elenor..