Calcium deficiency?

tmw77777

Active Member
From what I figure is calcium deficiency but with that I can't figure out why...
Even new leaves are spotted with brown rust spots and getting worse as it gets older.


Ph 6.0 with checked calabration
Using foxfarm cal mag as directed 5ml per gallon
50/50 Ro /tap water
Roots look healthy white and smell good but water has a little fishy smell.
General hydroponics nutes
Ppm 500
Blue dream fem seeds from Narvona.
 

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kod42

Well-Known Member
I'm definitely not a expert just yet, but I think those might not be rust spots they look way to dark unless that's just lighting. New leaves shouldn't be affected that quick. Did you try giving her some cal/mag just Incase?
 

curious2garden

Well-Known Mod
Staff member
From what I figure is calcium deficiency but with that I can't figure out why...
Even new leaves are spotted with brown rust spots and getting worse as it gets older.


Ph 6.0 with checked calabration
Using foxfarm cal mag as directed 5ml per gallon
50/50 Ro /tap water
Roots look healthy white and smell good but water has a little fishy smell.
General hydroponics nutes
Ppm 500
Blue dream fem seeds from Narvona.
Get a picture of the entire plant. What's your substrate. What's your light.
 

tmw77777

Active Member
Get a picture of the entire plant. What's your substrate. What's your light.
Yes I don't understand this also today I dropped my ph 5.7 in hopes that it would help.
Get a picture of the entire plant. What's your substrate. What's your light.
But I'm using T5 6500k for lighting because I'm vegging and using expanded clay.
Water is about 2 inches below net pot water temp about 65 deg. Here is a few more photos.
 

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curious2garden

Well-Known Mod
Staff member
Yes I don't understand this also today I dropped my ph 5.7 in hopes that it would help.


But I'm using T5 6500k for lighting because I'm vegging and using expanded clay.
Water is about 2 inches below net pot water temp about 65 deg. Here is a few more photos.
Ca is best absorbed at a pH of roughly 6.0 - 6.3. I pH my res down to 5.8 after 24 hours of sitting. During the course of its use it swings upward, for me usually to 6.3 It's the higher end you get Ca uptake.

NB: edited to add this chart
1666623242973.png
 
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BallsackSal

Active Member
looks very similar to an issue I was having. pH swings caused my "rust" spots. I got a pH doser controller and the issue was completely eliminated. Mine had nothing to do with "CalMag"
 

Week4@inCharge

Well-Known Member
Ca is best absorbed at a pH of roughly 6.0 - 6.3. I pH my res down to 5.8 after 24 hours of sitting. During the course of its use it swings upward, for me usually to 6.3 It's the higher end you get Ca uptake.

NB: edited to add this chart
View attachment 5217060
This would be true in a regular soil grow, I think he's using expanded clay, an inert media, "An ideal pH for calcium to become available for cannabis plants to uptake is in the range of 5.2-5-8. This range is the general range for growing cannabis in soilless mediums".
 

curious2garden

Well-Known Mod
Staff member
This would be true in a regular soil grow, I think he's using expanded clay, an inert media, "An ideal pH for calcium to become available for cannabis plants to uptake is in the range of 5.2-5-8. This range is the general range for growing cannabis in soilless mediums".
Ca is still best absorbed at 6.0 to 6.3. I've grown in both Leica/Hydroton and now Coco/Perlite for years. You let your reservoir swing so you take advantage of all the nutrient windows. If you're running a res below 5.5 your cannabis is suffering.
 

Week4@inCharge

Well-Known Member
Ca is still best absorbed at 6.0 to 6.3. I've grown in both Leica/Hydroton and now Coco/Perlite for years. You let your reservoir swing so you take advantage of all the nutrient windows. If you're running a res below 5.5 your cannabis is suffering.
That 5.2 does seem to be on the low side. Interesting that in Coco 6-6.3 has worked out. I'll have to remember that one.
 
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