Is this calcium deficiency?

I know the photo quality is horrible but hopefully someone can confirm before I do anything more than a foliar treatment. I am using MagiCal in addition to the regular ferts, pH started at 5.5 and drifted to 6.1 before I took it back down last night.


The two bottom guys show it here:

is this a plant on Mars?

scroglodyte said:

is this a plant on Mars?

Click to expand...

Lulz, it's under LED.

Your PH drifting up to 6.1 is fine I would let it drift to 6.3. Nutrients are taken in at different PH 5.5 -6.3 .
Anyways yeah that looks like it could be cal/mag issue what medium are you in ? Coco or soil? or DWC?

It's DWC; in the cup I have a layer of hydroton then the RapidRooter plug the seeds germd in. The water level is still at the bottom of the cups. You think foliar will be fine for now or should I dump the rez?

not enough details need to know nutrients usd as well as how strong your mixing them, personally i wouldnt ferrtilize anything under 6 inches tall with any mix over 300 ppm till it hits 12 inches or in a 2 gallon pot, in hydro i run under 700 ppm till the week before flower

It's ~300 ppm comprised of a custom mix using the Cannastats Nutrient Profiles to mimic Lucas Formula. The profile I am using is (values in PPM):
92N
35P
101K
26Mg
49Ca
2.31Fe
.13B
.32Mn
.32Zn
.32Cu
.03Mo
Total= 306ppm
(Any micro not listed is at 0 ppm, i.e. S and Na)

300 PPM isnt so bad... You need to add Cal/Mag though if you are using reverse osmosis water. 5ml per gal should do the trick.

Thanks to those that helped/confirmed my fear. Pretty sure we nailed this, as the foliar feed of MagiCal/DM Saturator combined with flushing the plugs worked, or at least halted the damage. I'm pretty sure the problem was linked to me drenching the net cups with Heisenberg tea (pH over , and since the roots are still largely contained in the RapidRooter plug, the pH in the plug fucked me even though I had all my nutes/micros in the solution. Reps for the help!