Calcium Deficiency?

[LabMan]

This is a 4 week old auto that has been vegged under LED lighting. I just started to notice the rust looking spots a couple days ago. Also the tips of a few leaves are bending at a 90 degree angle and pointing straight up, but they are green and not burnt. I havnt really given her much cal/mag in the feed and it looks like it could be calcium to me. I gave a normal/heavy dose of cal/mag+ in the feeding yesterday and hoping it takes care of the issue. She has two sisters the same age but smaller that are not showing any deficiencies. I am using perlite hempy with a little OC+ and FF liquid nutes. Any thoughts would be much appreciated.

Side note: I dont think that it is fungus. The rust spots do not rub off the leaf at all and the air flow has been pretty good with RH right around 50.

 

[LabMan]

Oh, and it is an auto. Just started stretching and drinking a lot of water about 5 days ago. Maybe P or K?

 

[cannilingus]

i never have ca deficiency. i am lucky with the water i have here. it is currently running 113 ppm, on its own. and, its all ca. so. i dont need to supp it. try flushing her. that may be an iron def. i have been using dyna gro, as a nute. its has a wide coverage, for minerals. and is economical to use. most all, if not all, of the non organics, come from mother earth. and, dont have free insects with them.

 

[LabMan]

After reviewing a deficiency chart and doing some reading I am pretty sure it it a magnesium deficiency.

 

[arteekay]

I had very similar looking spots, and thought it was magnesium but everyone else said calcium.

So there, no help at all.

 

[LabMan]

Haha well I'm using cal/mag so if it's either of the two hopefully I should be ok.

 

[arteekay]

Always worth mentioning that PH needs to be correct for the cal or mag to be unlocked and available.

 

[LabMan]

Yeah I try to keep my pen calibrated and check it every time I mix the nutes.