I have noticed that a lot of lower leaves are turning yellow. Theres nothing special going on, it just fades from green to yellow evenly. I am feeding it Veg nutrients 3:1:3. So it can't really be a Nitrogen deficiency right?!
The plant isn't experiencing anything bad; it's the natural process of flowering because it sends nutrients from the leaves to the buds. It's a good idea to trim those yellow leaves since they no longer affect the flowering or growth.
The lower leaves will die off over time. its nothing to worry about. the plants just reclaiming its green energy. they'll die off its completely normal