It doesnt look like natural N defiecency, i dont understand how you say it isnt on the buds when clearly the samll leaf structure around the buds is affected. 5 weeks flowering you shouldnt see that much yellowing in my experience. YOu could get better help if you could describe your setup, soil or hydro, what e.c are you feeding with, what is the ph, and what has your feeding schedule been could there be some salt buildup if so just water with regular ph'd water next time with no nutes.
Yeah, you're right... I didn't notice that one bud... its pretty bad on that one...
Setup:
Soil (Fox Farms Ocean Forest)
Tiger Bloom Nutes (1/4 dose)
pH of the water is 6.3
pH of the soil when I checked the runoff about 4 days ago was 7.1...
I flushed them over the weekend with just pHed water and the nutes started again today w/Superthrive (normal 1cc/gal does)
The watering schedule is every 42 hours... it's automated on a drip irrigation system I built... soil is draining nicely as well...
A couple weeks ago I went on vacation and there was a slight malfunction with the irrigation system and they were given too much water so they were sitting in their runoff for a few days before I came home and cleaned them up... I figured it was nute burn because they were sitting in that nuted water... but it's not exactly going away, so I'm a little concerned.