Bane of hydroponics, root rot help

Hello,
Got root rot. Had it also last year in summer. Blamed on heat and had no chiller. Back to now, winter in Europe, or rather "winter". Got tent with thermostat plus higrostat connected to heater and humidifier, as well as second thermostat connected to chiller. Got water pump circulating whole system. Also on/off drip system.
My current problem : root rot.
Inside temperature 21-24, reservoir 19 Celsius.
Humidity ~70% (had wilting so tried this).
pH5.8-7.2
EC around 1.8 (tap e.c. is around 0.7).
Air pumps ; total over 6000 l/h. Hailea aco2208+aco308+ two smaller 8watt ones.

In order:
Tried adding bennies (that's when i Had these new roots sprout as per picture, before getting worse)
Tried adding trichoderma from GH. Nothing. Added a bit of Lathyrus odoratus to some pots, those actually started growing good... Having nice roots from trichoderma.

Tried adding chlorine sterilization of whole system + plants soaked for 30m in 50ppm chlorine + boiled Clay pebbles+pots in pressure cooker, nothing
Currently replanted to Coco...
What am I doing wrong? Can't do any grow!
Current fert: plagron hydro,
Waiting for GH maxigro and maxibloom...

Completely black totes with reflective PAR+ sheet on top to negate light inside.
Do I do overkill on nutes?

RDWC?

Yes, RDWC. Pump with 130 mesh filter I clean and sterilize

edvin said:

Yes, RDWC. Pump with 130 mesh filter I clean and sterilize

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Could be your water isn't moving enough.

You try hydroguard? Might need a uv sterilizer if it keeps coming back

edvin said:

EC around 1.8 (tap e.c. is around 0.7).

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problem #1. your tap is way too hard. can you get RO or distilled? and 1.8 total EC is way too high for plants that small. your nute EC should be more like 0.3 to 0.5 not 1.1

edvin said:

plants soaked for 30m in 50ppm chlorine

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problem #2: free chlorine for plants should be maximum 5 ppm, not 50.

Plants soaked in 50ppm but later flushed everything after cleaning whole system and put in 2 ppm chlorine. I am leaning towards either tap water being problem, (bacteria/fungi?!) Or nutes...

+1 to RMM

I struggled with RR for my last 4-5 grows. I did manage to save the last one once I figured out the problem: my water level was too high! That combined with 4 large air stones pumping 24/7, all that wetness got up into my starter cubes soaking them 24/7, which is the ideal environment for RR

As soon as I made the adjustments the plant recovered. Just harvested. A 6" top is not pictured in the last pics. See the way I tied it to hold it up? I choked it causing the top to die. Tiles are 12 x 12

hth

Plants died. Tried even transplanting to Coco, well, started new seedlings in full coco now and will try transplanting later. In the meantime sweet pea's are growing very well in the system... xD

What is that foaming bucket?

fragileassassin said:

What is that foaming bucket?

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Thats where I grew bennies. Actually It served as my dwc-cloner and well... I am growing these Sweet Pea's in there now. Gotta take pictures tomorrow, literally ALL plants grow EXCEPT weed. FeelsCursedMan...

oh man roots+50ppm chlorine = dead plants.
I did that once but it was too much peroxide. The roots disappeared lol.
EWC tea is the white slime slayer.
You are on the right track with the trichoderma. Brew that in conjunction with your HG or SAG or whatever BA product you are using.
Think of adding your bennies as building an "ecosystem" in your res. You want several types of beneficial bacteria and fungi.
Oregonsim XL has a really great package of bacteria,fungi. I would dare say you could brew that standalone and use it.
Only a pinch though, very very little is needed.

.

I live in Europe so many US stuff unavailable.
I suspect that yeah roots died. Undug ded plants one by one and roots were dead, dark brown. They were dying for quite some time,.. either root rot went systemic or chlorine. I read root rot suffocate plant if it attacks young plant and goes into whole of it. I think I reacted too late
I found:
200g for 10$. It's agriculture product made by local company. Will give it a try.
Dunno why fresh seedlings are getting this chlorosis. Suspected lack of calcium due to coco so sprayed with calcium nitrogen foliar spray and they slowly started growing again (cause they were stunted for some days).
Worried it might be root rot again?
Or maybe lack of nitrogen?

They're getting worse again. No idea. Planties grow first set of true leaves just fine and second set goes pale third goes bad and basically only baby leaves stay fine(intense green no problems) while other leaves wilt...

I'm heavily suspecting overwatering and root rot. Took them out, put into only gently moist mix of coco-vermiculite and put only 2ml of water to each plant stem directly containing 1/10 fert dose + 0.15% Bayer's Previcur Energy systemic fungicide.
That's so fucked up considering I also grow a lot of other plants seedlings currently (cucumbers paprikas tomatoes and many others ) and all do super good!

99% they need transplant on bigger pot

edvin said:

I live in Europe so many US stuff unavailable.
I suspect that yeah roots died. Undug ded plants one by one and roots were dead, dark brown. They were dying for quite some time,.. either root rot went systemic or chlorine. I read root rot suffocate plant if it attacks young plant and goes into whole of it. I think I reacted too late
I found:

Glomus. spp.GB 67, G. mosseae GP 11, G. viscosum GC 41	40%
Agrobacterium radiobacter AR 39, Bacillus subtilis BA 41, Streptomyces spp. SB 14, Pochonia chlamydosporia PC 50, Trichoderma harzianum TH 01, Pichia pastoris PP 59	18,60% 12,4 x 10^7 cells/g

200g for 10$. It's agriculture product made by local company. Will give it a try.

Dunno why fresh seedlings are getting this chlorosis. Suspected lack of calcium due to coco so sprayed with calcium nitrogen foliar spray and they slowly started growing again (cause they were stunted for some days).
Worried it might be root rot again?
Or maybe lack of nitrogen?View attachment 4490149

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Being that you are in coco (inert medium) you need to start feeding lightly right away.
Careful with foliar spraying calcium nitrate at that small size. Might burn em up

Usually that slime is algae, which results from light getting to your water somehow. People confuse algae with root rot. Slime on roots is algae. Once it starts, it's hard to stop. You might have to get rid of the plants and sterilize or replace everything, then make sure there's no light leaks at all. Or just grow in soil.

polishpollack said:

Usually that slime is algae, which results from light getting to your water somehow. People confuse algae with root rot. Slime on roots is algae. Once it starts, it's hard to stop. You might have to get rid of the plants and sterilize or replace everything, then make sure there's no light leaks at all. Or just grow in soil.

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the slime isnt algae its actually a cyanobacteria, but commonly referred to as brown algae, etc.

I don't think that's right. Cyan means blue or blue-green. Bacteria and algae aren't the same. There's brown algae, green, even clear as far as I know. But cyanobacteria must be blue or blue-green. I still think the slime is algae.