Problem?

[Mag11]

I'm a pretty new grower, I'm on my third run but learning a lot. I think I could use a little help from the community. I have 3 Coal Miners Daughter - 22 days old - they are in 3-gallon pots in my 2x4 under a Spider Farm SF 2000. This is my first time out using the Foop nutrients line and, per the instructions, in veg I'm using Veg 1 & 2 and Sweetener. Supposedly no other nutrients are needed in veg. However, I've noticed a slight yellowing on the side of the leaf of one plant (see attachment). I thought it may have been from a high light setting so I dropped intensity from 80% to 65% but I'm not sure that was it. Anybody have a clue? I want to nip whatever it is in the bud.

 

[Mañ'O'Green]

@Mag11 Welcome to AFN Your plant is showing signs of a Mg problem. Too much K or Ca can lock out Mg. What is the source and PPM of your water? Or you may need to add Mg?

 

[Mag11]

I’m using RO water with a pH of 6.3. My PPM is 400, which is a little less then where I'm supposed to be according to the feed chart. Foop supposedly is infused with Cal/Mag and Silica among other things.

 

[Mag11]

Looks like it was a Calmag deficiency, probably due to using RO water. Thanks everyone.