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DixinCider
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, I definitely have flushed the reservoir, but it didn't seem to help, unfortunately. And, even before I did so, and currently, the water chemistry seems really stable. I also strongly suspect microbial activity, but it must not be the kind that causes pH to drop like a rock. As for protection, I just got in some Dutch Master Zone, which is a sterilization agent. I'm not deploying it this run, because I've been using Capulator's Beneficials rather than something like Great White.i would run some fresh balanced water.
, a very good question. And the answer is, pretty old. o_O Not only that, but more than once, I've not cleaned it quickly enough after a run, and some pretty disgusting muck has formed in the thing in the past. I agree with you - all the plumbing has to be replaced, and the buckets scrubbed and *completely* sterilized. I've got to get as close to starting from scratch as I can.how old is your UC setup??
That's where I'm at too. :( As with dirk d, I think as much of the system has to be replaced as possible. Gonna' be a pain in the ass, but... we gotta get this grow show back on track, y'know?can only think of poor water, sulpher or just inproper sterilisation between runs?
not sure but just some thoughts
Thanks for all the suggestions, Gun. We're troubleshooting here, so please don't feel as though I'm just regular 'ol shooting you down when I address some of your points. ;) I'm familiar with the role of bennies, be it Great White, Voodoo Juice, or what have you. I started using Cap's formula because it has an exceptional reputation on the farm. I too would have hoped the beneficials would overwhelm any unwanted pathogens, but if you'll look closely at this shot from the first page...Ok, so Cap's Benies or Great White, essentially the same thing. Ultimately even if you had bad microbes in the system the beneficial microbes in Cap's mix should have been able to fight them off, rendering that a non-issue.
smokie, this is the same strain and nute line I work with every run, so no surprises there. Nute concentration is about .3-.4 EC.Blue Dream will do that to me if i don't give her enough cal mag at the beginning of flower
What is your nute strength?
th3b12ain: Thanks for the suggestion! Again, I wish it were something so simple... but my other spot used the exact same nutes (I had to lug 'em from place to place : P), and has nothing but pearly white roots. So... I'm not sure that can be the primary factor.
DixinCider: Well... the hoods are air-cooled, and not very hot under the glass. Plus, the symptoms are worst on the oldest fan leaves, well underneath the canopy. Take a look at the pics, maybe? It's a thought, though, thanks!
To anyone else who might roll through, I'm almost entirely certain that this is a microbe/root health issue. Look at the close-up shots of the root mass - browning and die-off on some of the thickest structures.
A couple thoughts about CO2. I considered that I might not be feeding heavily enough, but the nute concentration in the rez never changed, which would indicate to me that I had the concentration of the top-off rez set appropriately. Right? If they needed more, the EC would fall. If less, it would rise, no? And temperatures weren't as high as 85, but have probably been around 80F for flower.
Are the net pots choking your roots? are they 5.5 in or 8 in net pots?
smokie, you could argue that the pots aren't large enough, but keep in mind that I've been running this *exact* setup for a couple of years. Same system, same mother, same wattage, same water source, *everything*. This problem is unique to this run.I definitely agree you have issues with your roots, especially if a whole root ball just fell apart. However my comments about underfeeding still stand.
Mmm... no municipal supply, and neither you nor anyone else has asked that yet either, so all is forgiven. ;) In fact, a prize to you for suggesting new factors! No, I get my water delivered from a company that pulls it straight out of an enormous natural aquifer, so the chances of a significant change in water composition are slight.If you're on a muni supply, and forgive me if we've already discussed this, but I've had this same discussion repeatedly over decades, then it's very possible that the source water's quality has changed, and possibly quite significantly. Perhaps enough so that something has been able to take hold in your system.
As in had lab work done? No. It seems clear that there's one or more invasive organisms of some kind at work, but that kind of specificity hasn't been achieved.That root rot does not look good. Have you ascertained whether there is a fungal pathogen present?
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