Yellow leaves

Looks more like nutes are depleted

If its the lowest leaves going yellow, its nitrogen defeciency. Its not uncommon going into flower that plants need a bit of nitrogen to stretch and after that their need for nitrogen is minimal. And then towards the end of flower its quite normal for all leaves to start yellowing and dying off

If you need nitrogen, just use diluted piss. If you could elaborate more about your conditions, I might be able to help a bit. Like, if your using soil, what colour is your soil. Is your soil sandy, or clay-like? What are your temperatures, how much light do your plants get? What else grows there? If you can tell me about some of that (you can comment on one of my diaries or message me if you'd like). But even for other people who would potentially be able to help identify issues, it's a good idea to provide more info.

Too difficult to say. I dunno, but if I had to guess, calcium, potassium, sulphur, phosphor and nitrogen as main factors. It's never really a single issue, since it's about balancing stuff. Something about your soil composition/pH/heat/light, I dunno what, but it seems kinda fucked.

Im using gaia green dry amendments and i usually have too much nitrogen going into flower and i start getting dark green leaves and shiney. To me yours loojs lije deficiency in nitrogen which is wierd. What would do is start upping nitrogen a bit to see if anything improves