Cal mag deficiency i think help please

Ukkpa26

Member
Running DWC
PH perfect GMB half strength
ph 5.6-6.0 on average
800w led
i thought it maybe it was the LED burning them
its some light nutrient burn
strain is Star pupil
temps 78-80
30% humidity image1.jpeg
 

Joint Monster

Well-Known Member
Why do you say nutrient burn?

Looks like Potassium deficiency, which can also produce burnt looking tips, and that yellowing pattern.
 

myke

Well-Known Member
80F and 30 %RH is really low.I know its hard to raise RH so try to lower the temps.
 

Ukkpa26

Member
How old is the plant?What PPM?
5 weeks today with a ppm of 407 i thought maybe it was the nutrients, ive been doing half of what AN feed chart says. I was thinking of ditching them and going back to GH line
Im using tap and the base ppm is 57to 68
 

myke

Well-Known Member
sounds low,as joint monster says.needs more food.can u take pic of whole plant?
 

Joint Monster

Well-Known Member
5 weeks today with a ppm of 407 i thought maybe it was the nutrients, ive been doing half of what AN feed chart says. I was thinking of ditching them and going back to GH line
Im using tap and the base ppm is 57to 68
400 sounds low but they look okay in the very last picture. Can you clarify the scale you are using is PPMx700 or PPMx500?

The last picture you posted they don't look yellow up top, was that before the problem occurred?

Can you clarify if that yellowing pattern is also showing up at lower leaves, or is it just at the top few nodes?

I would come up to around 500, then 600 (at PPMx700 scale.)
 

Ukkpa26

Member
400 sounds low but they look okay in the very last picture. Can you clarify the scale you are using is PPMx700 or PPMx500?

The last picture you posted they don't look yellow up top, was that before the problem occurred?

Can you clarify if that yellowing pattern is also showing up at lower leaves, or is it just at the top few nodes?

I would come up to around 500, then 600 (at PPMx700 scale.)
Its on the 700x no thats now heres a better picture. a few leaves at the very bottom are yellow, the first few sets the plant made, so that pattern is only showing on the top few nodes
 

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myke

Well-Known Member
the leaves appear dark green,so seams to have enough N.
Ive had the same problem,I flushed and upped the nutes and it went away.
 

Ukkpa26

Member
the leaves appear dark green,so seams to have enough N.
Ive had the same problem,I flushed and upped the nutes and it went away.
im changes the rez and up them i hope it work im keep you guys posted i appreciate all the help and feedback
 

CannaCountry

Well-Known Member
I'd ratchet back your N a smidge and spray with some Epsom Salt; your girls look short on Mg. And don't fret on the temps / humidity; while your parameters may not be ideal, they aren't your culprit in this case. Don't sweat it; overall the plant looks good.
 
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