possible K deficient or Magnesium deficiency?

LordEnki · Apr 13, 2022

Possibly? I'm assuming under watering can also cause this?
first 2 pics are same plant. 2nd plant also showing earlier symptoms of first plant. I think I'm not watering frequent enough...
both are over 60 days in veg. 76° and 60% rh... 24/0 around 24 inches at 75% of 470W

hotrodharley · Apr 13, 2022

Magnesium deficiency

LordEnki · Apr 13, 2022

I've been watering lightly with Epsom recently also.... ill keep at it and see how much worse it becomes.
I did notice a bit of purple in the stems, but wasnt sure if that was relevant...

LeastExpectedGrower · Apr 13, 2022

Also, lay off the nitrogen a good bit. That last picture shows pretty serious clawing.

Popop · Apr 13, 2022

Amazing looking plant though

LordEnki · Apr 13, 2022

LeastExpectedGrower said:
Also, lay off the nitrogen a good bit. That last picture shows pretty serious clawing.

I've tried giving less N the last 2 top dresses. I dont know how much lower I can go.
would the occasional added EWC 2-0-0 be enough to have excess N, maybe?

LeastExpectedGrower · Apr 13, 2022

LordEnki said:
I've tried giving less N the last 2 top dresses. I dont know how much lower I can go.
would the occasional added EWC 2-0-0 be enough to have excess N, maybe?

Everything is slower in organic or if you're topdressing, doesn't it? So bioavailability may be in weeks rather than the days with standard grows or house with hydro stuff.

LordEnki · Apr 13, 2022

LeastExpectedGrower said:
Everything is slower in organic or if you're topdressing, doesn't it? So bioavailability may be in weeks rather than the days with standard grows or house with hydro stuff.

I go about 3 ish weeks between topdressings. next top dress is coming shortly, so I'll go easy on the N...

PadawanWarrior · Apr 13, 2022

LordEnki said:
Possibly? I'm assuming under watering can also cause this?
first 2 pics are same plant. 2nd plant also showing earlier symptoms of first plant. I think I'm not watering frequent enough...
both are over 60 days in veg. 76° and 60% rh... 24/0 around 24 inches at 75% of 470WView attachment 5117788 View attachment 5117789 View attachment 5117790

Looks like K deficiency on the big plant. What's your water source and what are you feeding?

LordEnki · Apr 13, 2022

gaia green 4-4-4 with bit of 2-8-4 and tap water up to this point. occasionally a cup and a half EWC.

PadawanWarrior · Apr 13, 2022

LordEnki said:
gaia green 4-4-4 with bit of 2-8-4 and tap water up to this point. occasionally a cup and a half EWC.

What's your water like? Well or city? Do you know the ppm? Do you have Ca deposits on faucets and stuff? Are you adding anything else? Just like to take care of the basics first.

Justin stoneberg · Apr 13, 2022

LordEnki said:
Possibly? I'm assuming under watering can also cause this?
first 2 pics are same plant. 2nd plant also showing earlier symptoms of first plant. I think I'm not watering frequent enough...
both are over 60 days in veg. 76° and 60% rh... 24/0 around 24 inches at 75% of 470WView attachment 5117788 View attachment 5117789 View attachment 5117790

Justin stoneberg · Apr 13, 2022

Amazing looking plant ... crafted

LordEnki · Apr 14, 2022

PadawanWarrior said:
What's your water like? Well or city? Do you know the ppm? Do you have Ca deposits on faucets and stuff? Are you adding anything else? Just like to take care of the basics first.

city water, not too hard. mineral deposits take a while to build up. i haven't checked ppm of my tap. ill do that later today.
i havent added anything other than Epsom with a few waterings recently.

rkymtnman · Apr 14, 2022

i'm not a dirt guy but it looks like nute burn led to nute lockout.

that small cola you can see at the bottom of one pic is burnt to a crisp

LordEnki · Apr 14, 2022

rkymtnman said:
that small cola you can see at the bottom of one pic is burnt to a crisp

thanks for noticing. lol
that crispy cola is from an auto thats in with them. its only got days left. that leaf damage occurred about a month ago on that one.
It is possible I'll have to go easier on the fertilizer going forward.

rkymtnman · Apr 14, 2022

LordEnki said:
It is possible I'll have to go easier on the fertilizer going forward.

do you measure EC/ppm of what you feed them?

coreywebster · Apr 14, 2022

I'll go against the grain and say lightburn from 24hour light constantly and or zinc def, also possibly from constant light stress

magnesium is mobile and should be from bottom up .

you using LED?

coreywebster · Apr 14, 2022

LordEnki said:
I've been watering lightly with Epsom recently also.... ill keep at it and see how much worse it becomes.
I did notice a bit of purple in the stems, but wasnt sure if that was relevant...

Try foliar feeding instead, faster acting so you can rule it out. Still don't think is magnesium def though.

LordEnki · Apr 14, 2022

rkymtnman said:
do you measure EC/ppm of what you feed them?

negative. i do not measure either.

coreywebster said:
I'll go against the grain and say lightburn from 24hour light constantly and or zinc def, also possibly from constant light stress

magnesium is mobile and should be from bottom up .

you using LED?

i am using LED lighting. i was thinking of going 18/6....

possible K deficient or Magnesium deficiency?

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