Too much light or magnesium?

[Rama777]

Yo! Started these off at 200 par and have been increasing by about 20 per day. Day 9-10 and now at 390 max par in one spot.

I use RO water and have been giving them 60-75 ppm of Calmag with each watering. Guessing it’s light or mag related but not sure which..

Obvious to any of you with more experience than I?

 

[Grower1974]

What medium? If it’s amended soil, they don’t need anything for another week or so. How wet are you keeping them? 250-300 PPFD is all they can use really at this stage.

 

[Rama777]

Gotcha thanks. I was recommended around 600 pat by week 3 and so divided 400 (the additional par above the initial 200) by 21 and got 19. So I was thinking 19 more pat per day but I realize that’s linear which might not be appropriate? I’ll back them off to 250-300 thanks!

Had some low temp issues that I got resolved today. They have been overly wet from slow dry times. Should be fixed going forward.

Yes the soil is amended so I’ll stick to soft water levels of calmag for a month.

 

[Imzzaudae]

To much light.

 

[BryanOconner]

almost impossible to over do calmag .

 

[GNick55]

almost impossible to over do calmag .

too much calcium can affect magnesium and potassium making it look like a deficiency when in fact it’s too much calcium,..

 

[BryanOconner]

too much calcium can affect magnesium and potassium making it look like a deficiency when in fact it’s too much calcium,..

Yeah . Well i never measure calmag. I just dump it in . Well that looks good. I would of over done it by now. .
So if a grower used only calcium they could over do it . Why that grower would not use calmag.