Day 45 flowering and fan leaves turning yellow

I'm into day 45 of flowering on my 10 blue cheese plants and some of my plants seem to be losing their colour and the fan leaves are turning yellow.They started turning yellow at the bottom of the plants but now the yellowness seems to be working its way up and now the top fan leaves are turning yellow.There doesn't seem to be anything wrong with the plants themselves,the buds are still looking good and the pistils have been turning brown for the last couple of weeks and the tricomes are still clear so i'm wandering whether this is just part of the plants life cycle which must be coming to an end real soon.Can anyone clarify anything for me?

i don't know what your feeding them mate? or how much etc but i add grow with my bloom all the way up until i chop mine down to try and keep them healthy until the end and it's served me well so far, i use bio-bizz and always add 1-2ml per litre of the grow depending on how they look and it does the job well

Make sure to add small amounts of veg nutes when you are flowering.

Its normal in late flowering that leaves are tuning yellow.Plant is useing Nitrgoen from leaves at this stage and its totaly normal.

alls sounds pretty normal to me also for day 45 considering it cud be only 14 more days to go thats bang on cue for yellowing up, man i av had that shit happen to on week 3 and bad yellowing and i still got 6 and a half dry ounces off 2 plants so to yellow up on day 45 u av no worys, on my last grow the leaves started to yellow around this time and dam the weed is fine plenty of it 3onc off 1 plant ( dry ), i do feed veg nutes 2 weeks into flower now as to av some staying power to the end !! but if ya got to the end and u dident av a fair bit of yellow it cud take a while to cure out the bud !!!!!!!!!!!!!!

blue cheese sounds beautiful by the way !

Nice one my man,that sounds exactly whats happening.I've been giving them well enough nutes so it aint that so it could be part of the life cycle.They've had Biobizz nutes-Biogrow,Biobloom and Topmax and as the previous post has said about more nitrogen being used during flowering,last week I went out and bought some extra nitrogen to top up but as I'm near the end of my grow,i don't wanna mess things up so I don't know whether to add it or not.I've also had a cheeky little tester on a couple of buds and boy,what a lovely smoke that blue cheese is

Dya think that I should add a little extra nitrogen or leave it as I've only got a couple of weeks left at most?

i would say leave it and juss use water for ur last 2 weeks so ur bud dont taste harsh nd full of chemicals...