HELP! Cold causing yellow lower leaves?

[Onceyet]

Cold the problem?
Second time growing Skywalker OG, but first time getting yellowing bottom leaves. Plants are 12” from lights, which are two 300w viparspectra blurple LED’s, in a 24x24x60 tent.
The other strain in the same tent, Critical, is doing just fine, with rich green leaves and no yellowing or spotting, or anything else really. However, the environment is colder than the last time I grew Skywalker, giving me now an environment of 63-66 degrees F, between 43-45% humidity. I live in the north, last grow was during summer and fall. Could that be it? Many thanks!

[TheKieftan]

I’m not an expert but that is almost definitely molybdenum deficiency https://www.growweedeasy.com/cannabi...num-deficiency

[DeadlyFruit]

That is a bit cool for daytime highs but doesn’t seem fatal cold, just slow growth and perhaps more incidence of hermies. With that said some genetics are better suited to cold which could be why one plant is growing better than the other. I’d be more likely to say it is nutrient related or something connected like how often they get the nutrient water or type of nutrients. What do you feed them and what is your watering schedule?

[TOKABIGONE]

I'm seeing a pH issue here most likely a little too high. Do you check it? What is your medium?

[dilvish]

try just increasing the temp if you can see what happens. kinda obvious but there are many factors that you haven't provided info on. More information on your set up would help.

[YYCannabis]

She needs nitrogen asap...and phosphorus.

[Onceyet]

Kieftan, Deadly Fruit, and Tokabigone — Thanks for the feedback. I’d forgotten about the PH issue. I tend to be more worried about getting the PH right going into the plants and not paying attention to it in the runoff. I will check that tonight. Here’s a photo of a leaf if that helps.

[dilvish]

looks like nitrogen deficiency but without more info its hard to tell.