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In the photo, it shows "B" and "C" labelled leaves, that are yellowing.
My question is that yellowing from lack of nitrogen? And is "B" have more nitrogen than "C" or is this a "progression" of losing nitrogen which is why its A->B->C?
Yes it's a progressive look at things. Starts between the veins, then continues thru out the whole leaf until no more green is visible and the leaf falls off.
As you flush your plants and get ready to harvest you'll see those leaves starting to yellow up. Its a god sign that your flushing it and the plant needs to use its nutrient reserves to put toward the flower growth in a last ditch effort to reproduce.
You'll also get a few random yellow leaves as time progresses, more so on the bottom. A few are nothing to worry about. I will feed/spray Humboldt Nutrient's Verde in veg to get all the nitrogen it needs for the flower cycle. Then the flower nutrients only take over (Canna Coco) for the remainder.
Basically you don't want to keep feeding it a lot of nitrogen in flower.
-------------------- Any help given is for educational purposes only. Its your responsibility not to break any applicable laws Bamboo Bongs I make | Perfect Dry and Cure | Grapegod under LED “Human beings, vegetables, or cosmic dust, we all dance to a mysterious tune intoned in the distance by an invisible player.” ~ Albert Einstein
those never helped me, there are better things that look better and help more
Ed Rosenthal's nutrient deficiency chart and chapter descriptions is more understandable, detailed, and helpful. a person whos never grown could read that book and diagnose with 85-100% accuracy. better pictures