DrJynx86answered grow question 4 years ago This is pretty normal during late flowering, Nitrogen will move up to top budding sites, and those leaves acting as reserves will get yellow, wither and die.
Plant is not uptaking lots of Nitrogen during flower, so adding some nutrients won't help much.
At this points your girls need P/K, the N will be taken from the leaves, not the soil.
Keep on the great care!
Happy smokes!