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Leaf Tips or Rising Run Off pH - What would you trust?

  • Thread starter Thread starter Terpz719
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Leaf Tips or Rising Run Off pH - What would you trust?

Terpz719 13 Replies 1,139 Views
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Terpz719

Terpz719

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#1
I'm getting conflicting signs from some of my plants. Any help navigating this would be appreciated.

Coco/Perlite in 3 gal pots
Day 17 of flower
Temps and humidity are good
Input - RO, Megacrop, CalMg - ppm 750 (150 of which is CalMg) @ 5.9
Run off ppm 100-200 ppm less than input

My current understanding:
The leaf tips indicates over feeding.
The run off pH indicates under feeding.

Some plants are just barely showing lighter leaf tips and the same plants are showing an increase in run off pH.

Img 0848 copy

Even with coco, should I just ignore the run off numbers? So, what's the deal farmers? Thanks!
 
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#4
You might be getting a little too acidic at 5.9. It's kind of hard to say from the photo, butyou might be seeing the beginnings of a lockout. During flowering, the chemistry changes a lot in the plant and issues that weren't apparent during vegging start to stand out. Overfeeding symptoms depend on if it is a straight overfeeding, or is an overfeeding of one nutrient affecting another (another type of lockout not based on Ph). Is there a reason you are using RO water? Nutrients tend to make things acidic. I use Promix, which is somewhat similar to Coco, but is based on Peat instead of coco. It has buffers to help keep the Ph near 6.5 to 7, in my experience.
The leaves don't really look too bad to me from the photo, but it's hard to tell without a more inclusive picture. I also use wood ashes to bump up my Ph, as it is both slightly alkaline and has a lot of macro and micro nutrients in it. I have mixed wood ashes with water and watered, as well as top dressed to Promix and try to scratch it in a little. The same thing would probably work with coco.
 
#5
I forgot to mention the run off pH is increasing by 0.8-0.9 and I average 15% run off.
 
#6
Jimster said:
You might be getting a little too acidic at 5.9. It's kind of hard to say from the photo, butyou might be seeing the beginnings of a lockout. During flowering, the chemistry changes a lot in the plant and issues that weren't apparent during vegging start to stand out. Overfeeding symptoms depend on if it is a straight overfeeding, or is an overfeeding of one nutrient affecting another (another type of lockout not based on Ph). Is there a reason you are using RO water? Nutrients tend to make things acidic. I use Promix, which is somewhat similar to Coco, but is based on Peat instead of coco. It has buffers to help keep the Ph near 6.5 to 7, in my experience.
The leaves don't really look too bad to me from the photo, but it's hard to tell without a more inclusive picture. I also use wood ashes to bump up my Ph, as it is both slightly alkaline and has a lot of macro and micro nutrients in it. I have mixed wood ashes with water and watered, as well as top dressed to Promix and try to scratch it in a little. The same thing would probably work with coco.
Click to expand...
Thanks for the response! Very interesting - about the chemistry changing and lockout due to one nutrient. My tap water isn't too bad (250ish ppm), but I like know exactly what I'm starting with. Inclusive like this?
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#7
Yellow tips can be from lightstress to. Are the lower ones burnt?
 
#9
chemistry said:
The tips are just the problem, showing the whole plant can show you the reason.
Click to expand...
Overall, I think the plants look OK, but I'll reserve judgment. I was curious about what I was seeing in the run off, and if it was pointing to the early stages of a possible problem.
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Second Grow - Welcome to the Jungle

Here we go. For this grow I'm mainly looking for some landrace goodness. Information on some of these lesser mentioned companies can be sparse, so I hope this helps some folks out. Honestly I don't find the early growth stages that interesting, so I'm...
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#13
What's the EC going in and the EC of the runoff?
 
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