possible K deficient or Magnesium deficiency?

[LordEnki]

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]

Magnesium deficiency

 

[LordEnki]

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]

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

 

[Popop]

Amazing looking plant though

 

[LordEnki]

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]

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]

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]

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 5117788View attachment 5117789View attachment 5117790

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

 

[LordEnki]

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]

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]

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 5117788View attachment 5117789View attachment 5117790

 

[Justin stoneberg]

Amazing looking plant ... crafted

 

[LordEnki]

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]

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]

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]

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]

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]

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]

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

negative. i do not measure either.

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....