-
Happy Birthday ICMag! Been 20 years since Gypsy Nirvana created the forum! We are celebrating with a 4/20 Giveaway and by launching a new Patreon tier called "420club". You can read more here.
-
Important notice: ICMag's T.O.U. has been updated. Please review it here. For your convenience, it is also available in the main forum menu, under 'Quick Links"!
My new problem
- Thread starter billgee
- Start date
C
Conformist
I'm dealing with the same exact problem but on a much smaller scale.
It's quite puzzling, all my plants are receiving the same dose of the same water but only 1 of them is showing issues.
I think it's pH related or at least, that's what most people say when doing a search on brown/rust spots on leaves.
It's quite puzzling, all my plants are receiving the same dose of the same water but only 1 of them is showing issues.
I think it's pH related or at least, that's what most people say when doing a search on brown/rust spots on leaves.
i'm not sure but this looks a bit like your problem, goodluck, Calcium Deficiency
--------------------------------------------------------------------------------
Problem: Signs of a cannabis calcium deficiency can be hard to pin down since calcium deficiencies are often accompanied by magnesium, iron, and other deficiencies. However, some of the major signs of a calcium deficiency are in the leaves which will display dead spots, crinkling, spotting, or small brown spots. Another sign of a cannabis calcium deficiency is new leaves will appear small and distorted with curled tips The insides of the plant and well as the flowers/buds may show signs of decay. Roots may show signs of bacteria and may be dying off or be under developed.
Solution: If the pH of your root zone is off, then your cannabis cannot properly absorb calcium through its roots so the first step is to ensure that you have the correct pH for your growth medium. Learn more about pH and cannabis. Different strains of cannabis tend to have different nutrient problems, but calcium, magnesium, and iron deficiencies often appear together in cannabis. Therefore many growers decide to purchase some sort of Calcium-Magnesium (often called Cal-Mag) supplement for their grow room in case this common deficiency appears. I have listed some available Cal-Mag supplements that I have used along below with some general information about each one. After supplementing with Cal-Mag and correcting the pH, you should expect to see new healthy growth within a week.
--------------------------------------------------------------------------------
Problem: Signs of a cannabis calcium deficiency can be hard to pin down since calcium deficiencies are often accompanied by magnesium, iron, and other deficiencies. However, some of the major signs of a calcium deficiency are in the leaves which will display dead spots, crinkling, spotting, or small brown spots. Another sign of a cannabis calcium deficiency is new leaves will appear small and distorted with curled tips The insides of the plant and well as the flowers/buds may show signs of decay. Roots may show signs of bacteria and may be dying off or be under developed.
Solution: If the pH of your root zone is off, then your cannabis cannot properly absorb calcium through its roots so the first step is to ensure that you have the correct pH for your growth medium. Learn more about pH and cannabis. Different strains of cannabis tend to have different nutrient problems, but calcium, magnesium, and iron deficiencies often appear together in cannabis. Therefore many growers decide to purchase some sort of Calcium-Magnesium (often called Cal-Mag) supplement for their grow room in case this common deficiency appears. I have listed some available Cal-Mag supplements that I have used along below with some general information about each one. After supplementing with Cal-Mag and correcting the pH, you should expect to see new healthy growth within a week.
Attachments
S
sallyforthDeleted member 75382
I would flush em out and back down on the nutrient strength first, making sure you have stable ph for the medium. Could be over feeding.
More info might help.
Also see what others say.
Hope you get it sorted.
More info might help.
Also see what others say.
Hope you get it sorted.
billgee
Member
I agree with you about the Cal-Mag. I also think I may have over-watered. I am using Coco and was told I couldnt over water. But obviously I can. Different plants reacted differently.
My real problem is when you speak of pH of the root zone. I was taught not to measure the pH of the root zone, its irrelevant with
Coco, which makes some sense. But so do you!
Find a new teacher. The roots are what absorb the nutrients. If the PH in the root zone is off, the plant can't absorb the nutrients. End of story.
It doesn't mater what the medium is. In hydro (the medium), the roots are immersed in solution. The PH of the solution needs to be 5.5 - 6.5
In soil (the medium) it's 6.3 - 6.8. Treat coco like soil unless you are using it in hydro like you would hydrotron. Since you are using it like soil, a higher PH like 6.5 - 7.0 is preferable since it is more or less inert like hydrotron.
Fix the PH before you start dumping in additives
The PH is the problem, the deficiency is the symptom
Last edited:
Find a new teacher. The roots are what absorb the nutrients. If the PH in the root zone is off, the plant can't absorb the nutrients. End of story.
It doesn't mater what the medium is. In hydro (the medium), the roots are immersed in solution. The PH of the solution needs to be 5.5 - 6.5
In soil (the medium) it's 6.3 - 6.8. Treat coco like soil
Fix for PH before you start dumping in additives
The PH is the problem, the deficiency is the symptom
Coco is considered inert like hydrotron. So your runoff should reflect (relatively closely) what the root zone ph is.
In one of your post/threads, you said your runoff was 5.0. That's way too low for the roots to absorb Mg.
Flush with PH'd water of 7.0 until you get the runoff to about 6.5 ish.
Use 1/4 strength nutrients at first. Things will clear up
PH needs to swing a bit because different nutrients are more available at different PH levels than others, so don't fixate on keeping it at a specific number. Adding nutes will lower it. It will swing higher as the plant uses the nutes up. This is what you want. Just keep it in the proper range.
This: http://www.growweedeasy.com/how-do-i-check-the-pH-of-my-water
and this: http://www.cannaversity.com/cannaversity/article.php?id=039
will help you understand what gets absorbed at what ph range
In one of your post/threads, you said your runoff was 5.0. That's way too low for the roots to absorb Mg.
Flush with PH'd water of 7.0 until you get the runoff to about 6.5 ish.
Use 1/4 strength nutrients at first. Things will clear up
PH needs to swing a bit because different nutrients are more available at different PH levels than others, so don't fixate on keeping it at a specific number. Adding nutes will lower it. It will swing higher as the plant uses the nutes up. This is what you want. Just keep it in the proper range.
This: http://www.growweedeasy.com/how-do-i-check-the-pH-of-my-water
and this: http://www.cannaversity.com/cannaversity/article.php?id=039
will help you understand what gets absorbed at what ph range
You haven't given us enough information to make a more accurate guess.
What is your temps in room and at the canopy?
What nutrients have you been using and at what rate?
Just tell us more about whats going on.
Looks like over nutrient to me. I've had plants that did that while receiving the same nutrients as the other plants. Solution was to cut the nutrient strength in half.
What is your temps in room and at the canopy?
What nutrients have you been using and at what rate?
Just tell us more about whats going on.
Looks like over nutrient to me. I've had plants that did that while receiving the same nutrients as the other plants. Solution was to cut the nutrient strength in half.
