K or Mg

User64

User64

Well-Known Member
I can't tell if this is K or Mg deficiency. Reading around and checking the Cannabis Grow Bible has me leaning towards Mg. The grow bible shows a specific picture called " praying for magnesium ". Which the second leaf pictured is doing. Just seems to be on the bottom leaves for now.


Growing indoors under two QB96 V2 running at about 55%
Watering schedule is played by ear. I lift the pots and check weight plus watch for drooping. I usually water when they start to droop.
Growing Medium is Nectar of the Gods #4
Stage of growth is 32 days.
Nutrients have been 1 gal of water with 1 TBS Roots Organics, 1 TBS Age Old Grow and 1 tsp of General Organics Cal/Mag.

I had been feeding them a diluted solution of that mix of about 40% every other watering. They suck up almost 24 ounces of that solution per feeding. Last plain watering two days ago just didn't seem to make them perk up like they usually do. Pots were super light tonight and they were at that droopy, feed me stage. Upped the mix to 100%, not diluted tonight to see if that helps.

This is a second run of Kinetic Genetics Intelligent Design, both have just been for learning. Not flowering at this time and trying to get a decent bonsai mom to keep for a while. The first run was a huge learning experience on how to care for these plants. This second run, using that knowledge, has been 100% healthier and bigger. This run is really showing its Indica side whereas the 1st run seemed more Sativa since they were treated so poorly until I figured some things out.

Still unsure what deficiency this is but am leaning towards Mg with the Grow Bible picture " praying for Magnesium "

Thoughts ?

01.jpg 02.jpg
 
C

CannaCountry

Well-Known Member
Based on your pic, I would say you're short on Mg, however, why it's showing short is another story. It would be interesting to...

...see a full plant pic
...know what pH you're feeding
...know what pH you're watering with
...know your water source
...know if any of the nutrients you're using contain Mg
...know more details.
 
User64

User64

Well-Known Member
CannaCountry said:
Based on your pic, I would say you're short on Mg, however, why it's showing short is another story. It would be interesting to...

...see a full plant pic
...know what pH you're feeding
...know what pH you're watering with
...know your water source
...know if any of the nutrients you're using contain Mg
...know more details.
Click to expand...
Not sure on water pH, it's distilled water. Still need to get a meter for that. Soil pH is at 7
Nutrients were listed in the post. "Nutrients have been 1 gal of water with 1 TBS Roots Organics, 1 TBS Age Old Grow and 1 tsp of General Organics Cal/Mag. "

Whole plant shot
.20200801_214710a.jpg

Going back to the IC Mag The Complete Guide to Sick Plants,pH and Pest Troubles, wondering if the next level of lower leaves are showing Zinc deficiency ?
 
Last edited:
Bernie420

Bernie420

Well-Known Member
User64 said:
I can't tell if this is K or Mg deficiency. Reading around and checking the Cannabis Grow Bible has me leaning towards Mg. The grow bible shows a specific picture called " praying for magnesium ". Which the second leaf pictured is doing. Just seems to be on the bottom leaves for now.


Growing indoors under two QB96 V2 running at about 55%
Watering schedule is played by ear. I lift the pots and check weight plus watch for drooping. I usually water when they start to droop.
Growing Medium is Nectar of the Gods #4
Stage of growth is 32 days.
Nutrients have been 1 gal of water with 1 TBS Roots Organics, 1 TBS Age Old Grow and 1 tsp of General Organics Cal/Mag.

I had been feeding them a diluted solution of that mix of about 40% every other watering. They suck up almost 24 ounces of that solution per feeding. Last plain watering two days ago just didn't seem to make them perk up like they usually do. Pots were super light tonight and they were at that droopy, feed me stage. Upped the mix to 100%, not diluted tonight to see if that helps.

This is a second run of Kinetic Genetics Intelligent Design, both have just been for learning. Not flowering at this time and trying to get a decent bonsai mom to keep for a while. The first run was a huge learning experience on how to care for these plants. This second run, using that knowledge, has been 100% healthier and bigger. This run is really showing its Indica side whereas the 1st run seemed more Sativa since they were treated so poorly until I figured some things out.

Still unsure what deficiency this is but am leaning towards Mg with the Grow Bible picture " praying for Magnesium "

Thoughts ?

View attachment 4640820 View attachment 4640821
Click to expand...
Looks mag to me

learn how to water a plant waiting for it to droop causes stress and fucks with the plant.

And you have no idea of how many ozs a plant sucks up .... thats silly
 
Joncoh101

Joncoh101

Well-Known Member
User64 said:
Not sure on water pH, it's distilled water. Still need to get a meter for that. Soil pH is at 7
Nutrients were listed in the post. "Nutrients have been 1 gal of water with 1 TBS Roots Organics, 1 TBS Age Old Grow and 1 tsp of General Organics Cal/Mag. "

Whole plant shot
.View attachment 4641784

Going back to the IC Mag The Complete Guide to Sick Plants,pH and Pest Troubles, wondering if the next level of lower leaves are showing Zinc deficiency ?
Click to expand...
Most definitely a ph issue, that yellow type stripe is a dead giveaway. As for the wilting thats over watering or your environment is off in some way, temperature or humidity. When my plants got too cold when the light was off, they wilt like that
 
C

CannaCountry

Well-Known Member
User64 said:
Not sure on water pH, it's distilled water. Still need to get a meter for that. Soil pH is at 7
Nutrients were listed in the post. "Nutrients have been 1 gal of water with 1 TBS Roots Organics, 1 TBS Age Old Grow and 1 tsp of General Organics Cal/Mag. "

Whole plant shot
.View attachment 4641784

Going back to the IC Mag The Complete Guide to Sick Plants,pH and Pest Troubles, wondering if the next level of lower leaves are showing Zinc deficiency ?
Click to expand...
Zinc deficiency; no. Those leaves are a result of Mg. Distilled water can have a very high pH, coupled with a soil pH of 7 and you may very well be out of line on your pH, which is causing the issue. I know you listed your nutrients, the question is, aside from the little dose of Cal/Mag (do you feed this every time you feed your plants?) do your nutrients contain Mg? I would dial in my pH, and once you do that, if the Mg issue persists, it's time to up your Mg intake...and if the plant isn't showing a Ca shortage as well, I'd leave out the Cal/Mag and add Epsom in place...that will give you the Mg you need without added N or Ca.
 
User64

User64

Well-Known Member
CannaCountry said:
Zinc deficiency; no. Those leaves are a result of Mg. Distilled water can have a very high pH, coupled with a soil pH of 7 and you may very well be out of line on your pH, which is causing the issue. I know you listed your nutrients, the question is, aside from the little dose of Cal/Mag (do you feed this every time you feed your plants?) do your nutrients contain Mg? I would dial in my pH, and once you do that, if the Mg issue persists, it's time to up your Mg intake...and if the plant isn't showing a Ca shortage as well, I'd leave out the Cal/Mag and add Epsom in place...that will give you the Mg you need without added N or Ca.
Click to expand...
I've been feeding a diluted percentage of the 1 gal mix, about 50 % strength for every feeding. I'll dial in the pH as you suggested and go from there.
 
User64

User64

Well-Known Member
CannaCountry said:
Zinc deficiency; no. Those leaves are a result of Mg. Distilled water can have a very high pH, coupled with a soil pH of 7 and you may very well be out of line on your pH, which is causing the issue. I know you listed your nutrients, the question is, aside from the little dose of Cal/Mag (do you feed this every time you feed your plants?) do your nutrients contain Mg? I would dial in my pH, and once you do that, if the Mg issue persists, it's time to up your Mg intake...and if the plant isn't showing a Ca shortage as well, I'd leave out the Cal/Mag and add Epsom in place...that will give you the Mg you need without added N or Ca.
Click to expand...
Okay, using my calibrated Apera PH60, the nutrient solution mix has a pH of 6.78. Not sure how to do soil with it yet, need to figure that out. Soil test kit from a local chain hardware store shows the results pictured below, which is a composite picture. Kind of hard to capture the right color with only two hands and a cell phone. Seems like the soil is above 7.0 with that test kit. Once I figure out how to properly test the soil with the PH60, I'll feel more comfortable with those results.

Now to figure out how to adjust the pH organically. This has all been a great learning experience with these and I do appreciate your help. Thank you.
 

Attachments

Bernie420

Bernie420

Well-Known Member
User64 said:
Okay, using my calibrated Apera PH60, the nutrient solution mix has a pH of 6.78. Not sure how to do soil with it yet, need to figure that out. Soil test kit from a local chain hardware store shows the results pictured below, which is a composite picture. Kind of hard to capture the right color with only two hands and a cell phone. Seems like the soil is above 7.0 with that test kit. Once I figure out how to properly test the soil with the PH60, I'll feel more comfortable with those results.

Now to figure out how to adjust the pH organically. This has all been a great learning experience with these and I do appreciate your help. Thank you.
Click to expand...
You water in at 6.5 and let the microbes take it from there.
 
Joncoh101

Joncoh101

Well-Known Member
Someone please post that pH level scale from grow weedeasy.com basically, typical symptoms of pH being too low is magnesium deficiency because the pH level is too low for the Mg to be absorbed. Hence that weird stripe like formation on the leaves
 
User64

User64

Well-Known Member
Coming back to this just in case it helps someone else.

While the pH might be slightly off, I've gone to feeding them a little and watering a little. VS deep feeding or deep watering and letting them get droopy before feeding or watering. This seems to be working better and they do seem quite happy now. Obviously the damaged leaves will never come back but the tips that were yellowing on the higher leaves have come back and are no longer yellowing.

Guess I should treat these like any other living thing that eats to survive. I wouldn't be very healthy if I didn't eat until almost dropping over from hunger. These plants are no different.
 
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