Calcium deficiency?

T

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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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?
 
tmw77777 said:
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.
Click to expand...
Get a picture of the entire plant. What's your substrate. What's your light.
 
curious2garden said:
Get a picture of the entire plant. What's your substrate. What's your light.
Click to expand...
Yes I don't understand this also today I dropped my ph 5.7 in hopes that it would help.
curious2garden said:
Get a picture of the entire plant. What's your substrate. What's your light.
Click to expand...

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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tmw77777 said:
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.
Click to expand...
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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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"
 
curious2garden said:
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
Click to expand...
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".
 
Week4@inCharge said:
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".
Click to expand...
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.
 
curious2garden said:
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.
Click to expand...
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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