Fan leaves turning extremely yellow late flower

All of the sudden my plant was showing it’s on day 61 of flower.

Day 61 of flower and the plant is starting it's fade. Possibly a little low on Nitrogen, hard to tell from just 1 picture and no diary. Fuck knows what them 2 1st answers are waffling on about.

looks like n-deficiency... did it start at lower/middle areas first? even more reason to assume N-deficiency. Despite common dogma, a flowering plant still needs a good amount of nitrogen in flower. It depends a lot on how much you fed before any formula change too... relative to how much N i provide in vege and how much the plant nstores up from that choice, I only need about 75% of that concentration in flower phase. Still providing 90-100ppm... could probably dip to 70-80ppm. This won't necessarily translate for soil or if you feed at different levels for the month or two leading up to flower phase. this stuff is a culmination of choices you've made from the start and less so about what you did last week or last night... relevant, but only a small piece of the pie in total. it's too far awya to judge other potential symptoms. So if everythng else looks okay, bump N while maintaining other levels of nutes as best you can. Don't go too crazy.. the goal is to slow and or reverse the trend before the leaves accumulate too much damage and become worthless. Also, I can tell you over-defoliated this plant. Your fan leaves are mostly small and immature with a few that had time to grow out a bit. This too will influece fertilization.. you likely cut off a lot of useful stuff that was stored and would have given greater resistance to this progression of symptoms. Don't blindly defoliate. The proper way to avoid congestions is not to over crowd the canopy. there should not be gaps in the canopy in which you can see the soil or floor... this just means a shit ton of light is being wasted. Also, light hitting flowers does not make flower bigger, this is an urban myth. Flower material has 1/00th or 1/1000th the chlorophyl of leaves... yes, it can do 'some' photosynthesis,' but we are talking about 1% or .1% of what a leaf provides... the math here should be obvious why the bro-science about defoliation is utter bullshit. cocoforcannabis - "to defoliate or not..." is an excellent article to read. that site has by far the least amount of bullshit bro-science nonsense, as long as you avoid the forum comments... that shit is loaded with misinformation like everywhere else, lol.. because people's beliefs about this hobby are more about their ego than facts.