autoflower nutrient deficiency

You shouldn't see a deficiency or "need" to add nutes in week 3 if you're growing in soil, unless you have a ph problem which is your most likely culprit. A useful diagnosis aid: https://percysgrowroom.com/diagnose-a-cannabis-plant-problem/ Week 3 as the start of nutes is a carry over from growing in hydro, which you aren't doing. Nutes can be added in week 3 but it isn't going to fix a ph problem. I would test your ph first and fix that if you need to.