Yellowy leaves

Hi my plants 46 days from planted seed.Its an auto.Have looked online at various pics & it could be a number of things Any advce welcome & will be well appreciated!!

I would say they look almost done. Maybe 1-2 weeks left. I wouldn't do anything to them. Just give water when needed.

the lower leaves going yellow is normal as the plant ages and they do look a couple of weeks away but the browning in the middle of some of the leaves and edges of leaves curling down is similar to what is happening to me after some chronic heat issues (34C +) which are making my plants transpire quicker, meaning I have to water more and I'm running the risk of over-watering
Check you temps, hopefully I'm wrong and it's just the age of the plant but I suspect she's getting too hot, this close to harvest it's not going to be a show stopper so don't freak out and don't go to extreme's if it's a degree or 2 over ideal

The auto should be ,10 weeks,so still roughly 4 weeks to go& buds just forming & nowhere near ready.Looked at loads online.It seems or Mabe is a nutrient deficiency,so will try up the feed & see how it goes after 7 days.Thanks for replys.Other plant is healthy apart from some rusty bits on a few middle leaves .Read that it could be calcium deficiency. Feck knows!!!!

I would feed it some calmag next watering.