what's wrong

Phosphorus I'm guessing looking at where your plants are in life cycle. Google phosphorus deficiency and see what come up.
 
Have a look at this also. It's very in depth.

Guide to Nutrient Deficiency or Toxicity

So 99% of the times I come in here to see what people are up to and check what forum threads I can throw some advice in, its plant issues. "theres yellowing" or "leaf is dry and brittle" or "OMG SPOTS!" so instead of using the 'cut and paste' tools, over and over all day, like I feel I have...
www.rollitup.org
 
This is late stage Magnesium Deficiency. You can't fix damaged leaves, but you can stop it from spreading to new growth.

This is a great video.
 

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something is locking out your nitrogen an calcium an prolly mag. You'll have to fix the problem to get it to take in more N. The damage is pretty bad , i would give her two doses of "veg food" then see what happens from there.
 
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