Calcium deficiency?

[tmw77777]

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.

 

[kod42]

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]

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]

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.

 

[rkymtnman]

Using foxfarm cal mag as directed 5ml per gallon

isn't that stuff organic?

 

[curious2garden]

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

 

[BallsackSal]

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]

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]

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]

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.