@Cherubino,
I don’t come on here much anymore.. I was using fox farms strawberry fields soil for these (I think) my nutes never exceed 700ppm on these grows..
I never had much sucess w autoflowers and since I had a 3 light set up it was my only auto flower grow...
I recommend checking out “the grow boss” on YouTube.. the mods on this webpage don’t like him... but I can assure you his system and way to think of the plant works... hope this helps...
You don’t need nearly as much light or nutes as you think!!
like