I believe I have solved the nitrogen deficiency, even in the flora you can't forget about N. The buds are getting quite fat in these last days, I think we will reach 10 weeks of flowering.
We are in the 4th week of flowering and I noticed that many of the lower leaves are yellowing and the yellowing is rising, I watered it with banana and beet tea. Is it lack of nutrients? Look at the pictures.
looks like your plant has Nitrogen deficiency. Even though it is flowering, it still needs some Nitrogen to sustain itself! feed it some nitrogen and you should be fine.