By the looks of the leaves the plant is no longer able to get enough Nitrogen and Potassium to support all the green growth in the buds that started forming. The more and the larger the buds get the more they need. The plant then starts to take what it needs from existing leaves which is where plants store excess nutrients and just about anything else that might have been dissolved and in the water the roots absorbed.
And, once it starts to happen there does not seem to be a way to stop it. The best to hope for is to slow it down. I find that adding the flowering fertilizers starting at about 2 to 3 weeks before flowering works well enough to delay and reduce the 'cannibalizing' by several weeks.
Hmm....
If I remember correctly, this was subcool's supersoil, except I used a lot of rice hulls for aeration (like 50%).
(I expected them to compact down to 30-40% after they got wet, but they did not.)
We had the soil tested, and CBD saw that there was a very high amount of sodium in the supersoil (like 6x normal).
Many people thought the sodium came from the rice hulls, but I made a tea of rice hulls and tasted no salt at all.
Also, I have one test bucket running rice hulls right now, and it is doing fine.
I believe it was because they used table salt instead of Epsom Salt in the "All Mix".
I think it was early during that grow that CBD said the plants looked small and lighter in color, so to add N.
I am not sure why supersoil did not have enough N to start with, but I added human urine, and things did indeed seem to grow better for a while.
Then when things started to turn brown, CBD suggested CalMag, so we tried that.
Emmie suggested adding K, so I added banana peel, and also PK-13/14, so it should have had plenty of 'nutes (just too much sodium).
I was going to add the Sweet Candy, but instead I think I will save that for a future experiment.
Instead I think I will add the liquid PK-13/14 to this grow.
And we can use Terp Tea Bloom tea also.
I think the girls on the roof are happy with supersoil made with imported Roots Organic soil. I did add some kelp, but both girls on the roof seem to be happy, so I think it is a known-good place to start from.
I will be very interested to see if we develop the same problems this time, or if everything works as intended.
If everything works well, I will suspect it was the All Mix.