Larger Fan leaves dying?

i have a couple 2-3 weeks left of flowering, and i've noticed the larger fan leaves are starting to die. like they are draining, turning a brown/light green color.

here is my journal https://www.rollitup.org/grow-journals/144385-my-micro-ghetto-grow.html#post1838310

its lacking nitrogen,which is fine,you dont want a lot of nitrogen near the end of flower cycle,it causes the buds to grow airy,rather then dense nuggs,in nature the leaves fall off naturally when the plant is almost done in flower mode

oh ok. thanks a lot for that insight man. much appreciated.