I see multiple deficiencies- N and S for sure- on the 'sick' plant. But when all is said and done, you are pretty close to harvest and yellowing is normal.
You should NOT be feeding any type of fish emulsion of blood product in flower!!! In fact, the fertilizer you are using is already very N-rich- more so that you would usually like to see.
I am most concerned with the sulfur deficiency showing on the plants. It leads me to think that your real problem is a lockout, most likely from pH problems, since I don't see any significant fert scorch on those plants.
My main question to you is how far along into flower are you? I ask because it looks like you are nearing the time to begin flushing anyway, and all these issues become pretty much moot at that point. If you are 6 weeks in, you need to be flushing right away because of all that extra Nitrogen you gave them with the blood. Otherwise you are going to get some harsh product, and that would be a shame, because the plants actually look pretty damn good.
stinkyattic Reviewed by stinkyattic on . sick plant need advice Ok now i am concerned one of the plants is definetly unwell, its leaves are turning yellow and dying. I read up a little and thought it might be nitrogen def so i got some Arthur Bowers Fish Blood and Bone i started to use it around 3 days ago but it doesnt seem to be working. The other plant is fine which is unusual as they are kept in the same conditions fed and watered the same at the same time with the same products can anyone help me out heres a few pics Rating: 5