What is this? Some kind of deficiency?

[t33to]

It's only happening to one plant so far, and it's only just recently happened. The only thing I can attribute it too so far is that it is the biggest plant in the room. I thought maybe it was calcium def.

I am feeding lucas formula, i'm in the 5th week, my ec is around 2.25ish. Ph swings between 5.8 and 6.2. I also use Liquid Gold (2ml/g) and Calmag (1ml/g). They are in rock wool flock.

Any tips would be great.

 

[SumDumGuy]

It's only happening to one plant so far, and it's only just recently happened. The only thing I can attribute it too so far is that it is the biggest plant in the room. I thought maybe it was calcium def.

I am feeding lucas formula, i'm in the 5th week, my ec is around 2.25ish. Ph swings between 5.8 and 6.2. I also use Liquid Gold (2ml/g) and Calmag (1ml/g). They are in rock wool flock.

Any tips would be great.

Definitely looks like Calcium spots. I'd say it's to be expected if it's the largest of the batch. She eats more then everyone else simply because she's bigger. Are they being fed from the same food source. The foliage looks crisp and healthy with the exception of the spots nonetheless. On the 5th week the plants are really taking it in and will eat into the foliage in the absence of what it needs. From the looks of it you are using it at 1/5th of the recommended dose per gallon. The recommended is 1 teaspoon which is 5mL's so try upping the amount to 5mL's while watching your new growth. Can you shoot the whole plant as well?

 

[t33to]

Yes they are all fed the same food. I can't really explain why this plant seems to be doing the best. Her stalk is at least 2x bigger than the next biggest one, just a mutant plant. I figure there must be a "sweet zone" in the room where the air/temps are perfect.

I'll bump her personally some extra calcium. See if that helps. Thanks for your reply and comment. The rest of the room does indeed look great. Best crop I've done so far, we'll see how long it lasts.

Yes, I can try and take a shot of the whole plant/room for ya if you are interested. It was my first time using additives with the lucas formula, so I dialed them back to be safe and stuck with what was working.