Day 50 fading, brown spotting, possible deficiency?

Hi there
They look fine in my opinion. Entering last stage of plants life now. Those dead/yellow patches and spots on leaves are simply old age natural. Support leaves go first. They look good though
 
Hi guys, thanks again for all the help/suggestions.

I got a RH meter and my RH fluctuates between 40-48% so it looks like that shouldn't be an issue.

I tried to do a slurry test but I have a shitty amazon PH meter that I really don't feel confident with the readings.

Reached out to the NFTG guys about mixing salt based nutrients but havent heard back.

Getting purple edges on the smaller leaves on the main cola. Those leaves are also substantially lighter green.

Here are some pics
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I'm also running a Sour Diesel plant next to it that I have been feeding with liquid nutrients. Everything else is the same (light, pot, plant, age, etc) other than feeding it Dyna Gro nutrients at half the recommended feeding dose. Using Bloom 3-12-6 and Pro-Tekt 0-0-3. The plant healthy wise looks incredibly similar other than it having quite substantially thicker buds at this point (makes sense).

IMG_20210205_115323.jpg


I've gotta be getting pretty close to the finish line!
I am starting to lean towards maybe using some dyna-gro Pro-Tekt on my Tangerine Dream after seeing the results on the Sour diesel. My TD's structure is way better because of some LST early on so it would be great to really boost the yield if the K (which isn't in OneShot) is what's lacking. But on the other hand, I don't want to mess something up.

Any advice on finishing these up as healthy as possible would be appreciated.

Also best guess on how many days left?

Thanks again everyone!
 
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