mandalaman
- 2,367
- 263
That looks primarily like a pH issue. I've never done DWC or straight hydro, but low to mid 5s worked well for me doing perlite hempy tubs.
Alright buddy I haven't run DWC before. Only done hempy's like seamaiden but here's my 2 cents as someone who has ran organics and synthetics. You don't have any pests. That's for sure.
1. Your PH is all over the place. I'm not familiar with any of these nutrients but the reason for that is most likely the addition of the following:
MammothP - microbial
Heavy 16 Prime - sweetener/pH regulator (carbs/silica/molasses/humic/fulvic/vit b/kelp etc)
Heavy 16 Fire - pk boost/kelp
Heavy 16 Finish - ancient forest(is this another humic acid product?)
I believe you are experiencing a "bacterial bloom" in your reservoir. Essentially you turned your reservoir into a type of compost tea. You added the microbes, and then you gave them the food required to reproduce thus raising the PH. This is bad for two reasons. First off the bacterial bloom causes nutrient availability to go all over the place. Secondly they consume tons of O2 essentially robbing that from your plants roots. Without O2 your plants suffocate and develop root rot.
I'd say clean our your system and ditch all the organic/microbe stuff. Stick with your calmag, and base nutrients.
2. A starting PH of 5.4 seems a little low. I'd probably try to hit anywhere from 5.6-5.9
No problem at all! Yup I read everything. I actually said O2(Oxygen) not H20(Water) just to be clear. As in the lack of oxygen caused the rot is what I'm thinking happened. I don't think rockwool affected PH all that much.
That small plant definitely got some root rot alright. It looks like she could possibly recover but it may take some time. The big girl has a real good chance of recovery with a nice clean, stable, and basic reservoir. She actually looks pretty good aside from the leaf stress. Her nutrient uptake isn't even terrible considering the ph roller coaster.
Yup with enough O2 saturation doesn't matter. That's how DWC works in the first place. If there is enough dissolved O2 in the water roots can do their thing. If there is not then they rot. A medium like rockwool, coco, soil, etc. have similar rules where they require adequate O2 within the air pockets so the roots don't drown/rot.
With a closer look at that rockwool it looks like you put a small cube inside of a bigger cube before you put it in the grow rocks? Looks like that created a little pocket for rot. I'm assuming that was too much rockwool and you would have been okay with just the small plug. That alone would have provided more O2 to that area.
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