Fro5ty
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I just recalibrated my pH and EC pen. It was off by 0.5(!) pH. I kept it at 6.0. So it was really 5.5. It increased to 5.7 in the last 3 days. The tank that feeds the RdWC around 25L a day is at 6.0pH and 0.6EC. EC in RDWC decreased from 0.8 to 0.7 and is now back at 0.8.What is pH and e.c. of medium? What nutes? what growing medium? How did you figure out you have N tox?
If pH and e.c. was off prior and you just fixed, it will take the plants some time to recover since it seems the problem has been going on for some while, judging by the looks of the plants. pH rising or dropping out of range is not good
Sounds like you got it figured out, that's great.I just recalibrated my pH and EC pen. It was off by 0.5(!) pH. I kept it at 6.0. So it was really 5.5. It increased to 5.7 in the last 3 days. The tank that feeds the RdWC around 25L a day is at 6.0pH and 0.6EC. EC in RDWC decreased from 0.8 to 0.7 and is now back at 0.8.
nutrients are GH tripart. The waterchange before I left calmag out for once because I had a different problem on the lower leafs that didn’t improve by adding calmag. And because of the N tox, I chose to leave the calmag out for once. This last waterchange I added it back but the rust and burning keeps spreading.
i know I have N tox because of the dark green color of the leafs and some are very slim.
first time grower. But the last weeks I was able to keep pH stable. I now just leave my watertank as full as possible. Add new water everyday. So when there is a waterchange, most water has already settled.
the last waterchange I gave GH tripart (grow:micro:bloom) at 0:1:3 and 0,7 part calmag at 0.8EC. My watertank of 260L only had 50L left and then I added new water and added new nutes now with 0.7:1:3 and again 0.7calmag. Also added Hydroguard and pro-bloom. Roots look fine. I have some curling on some leafs too.
i’m going to change the water tomorrow.
When I say “just calibrated” I really mean 3 days ago. And the problem kept worsening. Some stems got red from stress to. Overall the plants look good. But I still have 4-5 weeks to go and am afraid it will get worse.Sounds like you got it figured out, that's great.
Enjoy the trees
You don't have N toxicity.
When I say “just calibrated” I really mean 3 days ago. And the problem kept worsening. Some stems got red from stress to. Overall the plants look good. But I still have 4-5 weeks to go and am afraid it will get worse.
I and some others have diagnosed this as Nitrogen Toxicity.
When you say “not comming back”, do you mean it will get worse and I will spoil this harvest? I’m letting settle the new water at 0.9EC and getting the pH down to 5.7 (will see when it has settled tomorrow). I added 170L of new water in the tank in the last couple of days so I added 100ml of calmag(6%N, 5%Cal, 12Mag), 50ml of micro (5-0-1), 30ml of grow (3-1-6) and 100ml of bloom (0-5-4). I’m changing the water tomorrow.For sure, it takes a while to stop getting worse and then start growing again. Sometime they never really come back and looking at your plants, they are nearly at that point. I think you may have caught it just in time, if you did catch it just in time.
I've just tossed many plants at earlier stages when I messed up pH bad enough because they never really grow nearly as well as they could have and sometimes they just die anyways, not worth the effort.
Some say just the act of moving the pH of the medium to much in a short period of time is enough to 'stress' the plant. Whatever that means or does, I have no idea.
I would guess if an excess of N only because pH is locking out other nutes that will allow the plant to grow properly. I think you need to send it to a lab to actually be able to 'see' what is going in in the plant tissue. Maybe they have home test kits by now. I think with any decently balanced nutes for cannabis and pH good, it would be difficult to have excess or deficiency.
It does look a bit like a Calcium issue but it's hard to say from the pics. Are you seeing those brown rust color spots only on the top leaves closest to the light? If this is the case and you're using LEDs, back you light off a little bit. If this is not the case, ignore my message.
What they meant by 'not coming back' is that the leaves that are damaged will not repair themselves. If you get a handle on the problem, you'll be fine.
I don’t think they are making new leafs now. They just focus on the buds, which I see grow day by day. I just hope they all get dense. It's day 33 and I was hoping on bigger kolas already.Those few downward curling leaves may be from a little too much N, but this is not a pervasive condition all over the plant (or plants).
As with other symptoms, the leaves never uncurl. You know it's no longer a problem when normal, uncurled leaves grow above the curled ones.
Phosphorus can interfere with both Ca and K, so if there's recently been a boost, in P, that might be part of the problem.
agreeView attachment 1201446View attachment 1201447
I and some others have diagnosed this as Nitrogen Toxicity.
They will produce new foliage look at some of the guys who defoliate at flip and mid flower - they def will produce leafI was told N was mobile and the dark complexion should improve on the existing leafs. I'm well in to flower. I think they don't make any more new leafs.
The leafs with the brown spots of the first photo's are only on one of the top branches. The branch in question isn't the one that's closest to the light. There are others that are closer. The closest is like 3-4 inches from the light, but she doesn't seem to mind it. Here is a video of the closest one. Video is like a week old now.It does look a bit like a Calcium issue but it's hard to say from the pics. Are you seeing those brown rust color spots only on the top leaves closest to the light? If this is the case and you're using LEDs, back you light off a little bit. If this is not the case, ignore my message.
What they meant by 'not coming back' is that the leaves that are damaged will not repair themselves. If you get a handle on the problem, you'll be fine.
What kind of light are you using and how close is it to the canopy? Also, is it dimmed or full blast? I'm assuming you're using LED lighting. All sorts of funky nutritional problems can be caused by too much light. With LEDs sometimes a little bit less is more, especially if you dont have a PAR meter to take a light reading. A lot of my issues when first using LEDs was using way too much light. Dimmers can be a blessing and a curse.
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