Calcium-mg def or overdose of PK ?

[Medigrow]

Can't get my finger on this issue...

Is it cal-mag def or an overdose (with twisting leaves)

RDWC
Flowering - 4th weeks
From clones
Led lighting with 660-730 supplement. (from 600 to 1000 PAR, depending on the area)
Using Current Culture nutrients
PH 6.0
PPM 350 (tips are burning if going 400+)
Using RO Water
Water temperature is 66 to 69F
Room temp: 83F
Humidity : 57%
No bugs


I noticed the PPM starts to raise after 4 days of flushing... I added calmag while stopping my nutrient injection and ppm started to lower a bit but stalled again...

I tend over a calmag def but that is crazy... According to CS's feedchart, I should use 2.5ml/gal of calmag (cococal) 6ml/gal of A/B and 3ml/gal of Mid.

I can't go that route else I'll bust my 350-400ppm limit range (as I said, tips are burning if going over 380-400)... So I'd go with proper ratio but still.. Seems it creates an imbalance... But I'm afraid of antagonist, like adding too much calmag and that overdose prevent other macro to be assimilated...

Also, I have few strains in the system and few ones are perfectly fine, no curling leaves, no spot, same distance from light if not even closer...

Thanks for your help! :)

 

[Medigrow]

Forgot

Co2 at 1500ppm

 

[Medigrow]

Starting to wonder if it's light stress... I'll raise fixture a bit and flush...

 

[growsince79]

350ppm is nothing. Over 400ppm shouldn't be too much. I'd be around 6-700 or more.

 

[Medigrow]

350ppm is nothing. Over 400ppm shouldn't be too much. I'd be around 6-700 or more.

At 600-700 ppm, I simply burn them...

My maximum achieved over few runs was 460 ppm and I was overdosing a lot!

 

[PK1]

i agree with @growsince79 you should be way higher then 350ppm. i used to stay around 900ppm bu this round im at 1.8ec and plants are taking it.

what and how are you mixing your nutrition?

 

[Kevuk]

Pk burn is lime green to bright yellow.

 

[Medigrow]

i agree with @growsince79 you should be way higher then 350ppm. i used to stay around 900ppm bu this round im at 1.8ec and plants are taking it.

what and how are you mixing your nutrition?

I use a tote...

Fill in silica, drop ph a bit, then Uc, coco, a, b and mid, with a tiny add of epson salt.

Seriously, I never been able to pass 460 ppm. I give plenty of air and even the CS website states that if going higher air/min/gal they suggest using half the strength.

"Pro" schedule is available

 

[steamroller]

I am soil , no hydro .
I would up epsom a little if in soil .

 

[Medigrow]

Are pictured cleaned up when we upload them from phone? Leaves in the outside area are perfectly fine...

Which brings me to a light issue...

I raised the fixtures to get 700-800 PAR

 

[growsince79]

At 600-700 ppm, I simply burn them...

My maximum achieved over few runs was 460 ppm and I was overdosing a lot!

I don't do co2, but maybe that's the problem. I can't imagine why a plant that can't handle much light or nutes would need extra co2.

 

[Medigrow]

I don't do co2, but maybe that's the problem. I can't imagine why a plant that can't handle much light or nutes would need extra co2.

the 460 ppm was nutrients, not co2..

Again, that is crazy how people don't believe me when I say I can't go higher than 450-460... On last run, i maxed out at 380-390 ppm. Everything was fine, healthy, not any signs like this. Same strains.

Here's the "outside" leaves, they are healthy.

I think I'll vote for a light stress issue :)

 

[Medigrow]

Here's what I was talking about... At the top of the ppm, that would be 350 ppm! (700 ppm for normal air input)