Magnesium deficiency? Hydro

Sick Plants & Problems
#1

I have what looks like a Mg def that I just can’t seem to fix.

I try and feed them more Epsom and still nothing.

Jack’s 3-2-1 pH drifts from 5.6 to 6.1 feed is dropping 0.2EC weekly from 1.3 to 1.1 which is what I’m normally at.

My only thought is this is something mimicing a Mg deficiency?

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This is a leaf at the top

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This is a fan leaf from the 3rd node

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#2

what kind of hydro system ? dwc, rw slabs + drippers, other…
DS

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#3

6 site Rdwc. 27 gal totes so about 71 liters per plant.

Been running this mix for 2 years now and never encountered this

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#4

honestly that leaf looks hungry…
I know you’re feeding it, but it’s pulling nutrients out then burning the leaf off…thats just what i see though

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#5

How do the roots look?

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#6

1ml per gallon of cal/ mag is my suggestion

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#7

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Not the whitest. But not bad.

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This is them as a whole. They have quadrupled in size in the past 2 weeks.

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#8

try checking your pen calibration
was there humidity rise or drop in the past few days or new lights introduced?

#9

There’s a fungus that will cause that. Don’t remember the name off the top of my head.

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#10

Just a quick question… is this a new strain you are growing.

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#11

Also a could you take a pic of the roots with the camera flash off.

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#12

I’ve encountered this exactly before in coco. I’ve always attributed it to pH fluctuation, but I can’t say if that’s it for sure.

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#13

I have to agree with lefthand. I have pics of leaves in my tent thread with the same issue. It was my rootzone ph being to high, but I’m in coco so not sure about dwc.

#14

I’ll say pH drift too…try to keep it under 5.8
Ds

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#15

Yup That’s what I was thinking too

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#16

This is a new strain. TH seeds chocolate chunk and critical hog. Only happening on the big fan leaves

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#17

Well I have a pH doser that was keeping it steady at 5.8 but I started making a drift with it since Mg is best absorbed at 5.8 and beyond. So I’m not so sure on pH.

I also have two pH measurements one with the doser and one with the combo meter (for feed) and they both are calibrated and reading the same

#18

That is a significant swing.

imo

N, P, K, Mg, or Zn. or pH.

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#19

That’s over 5-7 days. Not that big of a swing.

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#20

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Here’s a picture of the roots without a flash. Like I said I’ve had whiter but they aren’t bad and are filling up this 27gal tote quick for only being in it for less than a week.

The feed isn’t dropping as fast now. Dropped 10ppm since this morning

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