Plant yellowing.

From clone, 10 weeks vege.
All the leaves are yellowing.
The root ball is healthy, but very dense in a 5 gal pot.
Purple and stiff stems.
Reused soil + Gaia green 444.
Some powdery mildew.
24 hrs light cycle at 400 ppfd.
Temp 60 f. 50% RH.
Feed ppm 400. Runoff ppm 300.
it looks stunted.
Any idea how to fix it? Thank you

madmax62 said:

Temp 60 f. 50% RH.
Feed ppm 400. Runoff ppm 300.

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I'm lousy at diagnosing plant problems, but the quoted values could be problematic. 60F is pretty low and the plant won't operate optimally at that temperature, and it may also be part of why you're having mildew problems at relatively low RH. I have no experience with Gaia nutes, but that feed strength seems a bit low for a plant that size.

Personally I’d scrap it and scrub the room. Get temperature up.

Ten weeks at four hundred? That seems a little low, I shoot for five hundred. What Ph are you going in at? I understand that some growers don't worry about Ph in soil, but I do. I'm not as good at spotting trouble until I have to react as opposed to prevent trouble. If a veg plant is yellowing, I suspect nitrogen def. Sometimes its caused by lockout, but sometimes it is caused by not enough nitorgen. Do you have any beneficial bacteria working for her? I use recharge and mycos with a little molasses. You don't have to do all that, but any would help. If you wanna just try some earth worm castings, that could help get some nitrogen to her roots.

The plant looks stressed in general to me. Did this one get that stalk damage and/or a ton of defoliation all at once? Is this only one looking bad & the other plants are fine or u only grew one plant?