hi no magic answer but wanted to say other then the yellowing they look very impressive for your first run, and also for only the 3rd week or so of flowering?? saying which did you cary on giving veg nutes for the first week or so for the transition, as some people like to do that to give a last shot of n
I noobed out and have them in too small containers for thier size so I'm working on the feeding schedual that works best. I'm going to give them a dose tonight and let them go a day or two and check the soil.apart from the fading light green and yellow leaves the texture of the leaves look nice no spots or blemishes or that horrible dehydrated look
the plant could recover quickly imo
looks like they need feeding and have possibly been kept too wet/ watered too often
good luck
Going to take the recommendations of yourself and a few other kind, helpful folks. I will be posting updates.Looks underfed to me, they appear to need more Nitrogen, I'm not seeing the red I would expect in the veins from a Cal/Mag def. Since there is no burn on the plants at all, I must say good job on that, I would assume they are underfed.
Let us know what you are feeding them, how much, how often, what kind of water you're using tap/ro/distillied/spring/well/lake/mudpuddle. Once more info is given a better guess can be made as to what the plant needs.
edit: seen you already provided the info, I would assume underfed, up your feeding a slight amount and watch them over the next few days.
Way to much P!
No amount of N will fix this as it's NOT the problem!
NOT underfed!
The early use of high P bloom feed!
Could be the use of high P supplements to early/much.