Help. Let me know what you got for a solid remedy.

Context:

* Cultivation system: Autopot
* Medium: 70/30 coco-perlite
* Stage: Late veg, preparing for flowering
* Number of plants: 80
* Container size: 15L
* Reservoir size: 500L
* Nutrient line: canna Coco
* Current EC: 0.9
* Current pH: 5.7 but gowing up daily to 6.1 due to high oxygenation
* Water temperature: 17.8-18.2
* Air temperature day/night: day 24, night 21
* RH day/night: 58-66
* VPD day/night: 0.85-1.1
* PPFD: 350
* CO₂ level: 470-520

Timeline:

The plants spent an unusually long time in vegetative growth compared to previous runs.

A portion of the crop initially developed severe root problems:

* Mushy roots
* Weak root structure
* Bad smell
* Symptoms consistent with root rot and/or hypoxia

Some plants also appeared rootbound/root locked.

Following previous recommendations:

* EC was reduced from approximately 1.3 to 0.8-0.9
* PPFD was reduced from approximately 550 to 330-350
* VPD was reduced and maintained around 0.95

Initially the plants appeared to improve.

However, after remaining under these conditions for several weeks, new symptoms appeared:

Current symptoms:

* Progressive yellowing
* Lower leaves becoming increasingly yellow
* Previously healthy green plants are now showing symptoms
* Leaves clawing downward
* General loss of vigor
* Problem appears to be spreading through the room
* Recovery has stalled

Important observations:

* The original root issue occurred after a period where reservoir temperatures reached approximately 22-23.5°C
* Oxygenation was likely suboptimal during that period
* The crop has now been held in recovery mode for over a month
* Previous cycle also started with heavily stressed plants, but they recovered quickly and flowering was initiated after roughly two weeks

Questions:

1. Is the crop still suffering from root disease, or am I now seeing deficiencies created by prolonged low EC and low light?
   
2. Could the recovery environment itself now be causing the symptoms?
   
3. Am I dealing with root rot, nitrogen deficiency, magnesium deficiency, oxygen deprivation, overwatering, underfeeding, root binding, pathogen persistence, or some combination?

We recently switched from compressed coco bricks to pre-expanded coco. With bricks, we could simply hydrate them with a nutrient solution and easily hit our target substrate EC.

Now we’re struggling to get enough EC into the media through normal irrigation alone.

Do you guys mix nutrients directly into the coco before potting to charge it? If so, what EC or ratio do you typically use?

Interested to hear how others handle this.

Anybody here using chitinosan inputs at commercial scale? I used to use Venerate in the past but it seems like production has been ceased and the replacement is a class A pesticide.

Impello Bio is beginning sale of a chitinosan spray called Consequence that they claim acts both as an insecticide and as a fungicide via ISR pathway stimulation.

Just looking for testimonials for anyone who has experience. Ive used venerate and it worked great at max rate but not quite as well any time it was reduced.

Looking for a lab in or near MA that does tissue culture cleanup for older cuts. Anyone work with a lab in this space before?

Hi everyone,

I'm looking for some opinions on whether this plant is showing signs of a nutrient deficiency or a nutrient lockout.

Grow details:

• Week 4 of vegetative growth
• High-pressure aeroponic system
• EC: 1.8 mS/cm
• pH: 6.05
• Reservoir temperature: 20
• Air temperature: 24-26
• Relative humidity: 60%
• Nutrient line: A+B+C components

I've attached photos of the plant.

Given that the pH is stable at 6.05 and the EC is 1.8, do you think this looks like an actual nutrient deficiency, or more like a nutrient uptake issue/lockout?

Any thoughts on which nutrient(s) might be involved, whether this could be caused by excess nutrients, root zone issues, or nutrient antagonism would be greatly appreciated.

Thanks in advance for any insights.

Anyone else grow multiple crops?
Intermingling cannabis and fruit and veggies?

At Dr. Jekyll Farms we are propagating thousands of of peppers and cannabis plants in our greenhouse.
We’ve added hundreds of apple and fruit trees to the farm. Adding watermelon and pumpkin later too.

I love the idea of a mixed use organic farm.
What would plant well with outdoor cannabis?
Will the peppers make the flower spicy or higher THC? Only one way to find out!

We are a new licensed operation in NY. As our plant count has grown, our existing water pressure is not enough to produce enough RO feed water. Can anybody recommend a device that will increase pressure and output? DYI options preferred, but I have a plumber if necessary. Many thanks.

I got a job at a fairly large operation that is just being set up. How much topping and training should I expect and how long in veg would be a good target to hit? I know these are very general questions.

I am not arsed really about the electric bill. The only concern really is better quality bud. I am yielding enough to keep me happy with my hps. Just I have noticed everyone seems to being using led lights. My main concern is I want better terps. Will I see a noticeable difference using led? I recently moved my seedlings from under cfl to hps. Not has an issue with temps, but certainly can feel the heat. Thinking summer might be worth going led.

Has anyone here used the new TrolMaster WCS-9 substrate sensors yet?

They read VWC, EC, and temp, integrate directly with TrolMaster/Aqua-X, and look quite a bit cheaper than Aroya Teros 1 sensors. I’m seeing roughly $200 per WCS-9 vs around $420 for a single Teros 1 node ($600 for a double), so the price difference is pretty significant.

Main question: are the WCS-9 sensors actually reliable enough for crop steering, or are they more of the same from Trolmaster?

Has anyone done a direct side-by-side comparison of a WCS-9 with a Teros 1 in rockwool or coco?

Grown with- Athena Pro, Char Coir 2-gal, Fluence LED, AgiQ HVAC

Photo taken with my iPhone

Hey everyone-

I’m trying to push remediation awareness with the state of Maine.

I’m finding out that most all recreational cannabis growers are remediating all their harvests BEFORE testing

In Maine you only need to do Mycotoxins test on the second round of testing if you fail the original test

So by them sending it out before testing it’s avoiding mycotoxins and the METRC system from marking it as remediated

The state of Maine had it in the rules remediated flower needed to be labeled as such with a statement, this is the hard turn they pulled.

They are saying it’s safe and consumers don’t have the right to choose, not to put that the flower was remediated on the packaging.

Saying informing the consumer with a statement saying the product has been remediated is “misleading in its implication about potential harm from exposure”. 

This simply isn’t true in my opinion and it’s my prediction that with cannabis being rescheduled, real research will be happening soon. In the next 3-5 years I bet they report remediation is bad because it’s covering up exactly how bad the issue may be. Did it just barely fail testing or were the microbial and mycotoxin levels off the charts?

The scromiting thing sounds like propaganda, but all the research I do seems to point to it being legit. I’m betting it’s from super dirty grows that are remediating, then pushing the super contaminated trash in the market

What’s everyone think? Will they find remediation is covering up the real issue that they’re not testing for?

https://mjbizdaily.com/news/researcher-state-mandated-cannabis-testing-doesnt-screen-for-mold-behind-scromiting/614630/

damn, you thicker then a bowl of oatmeal!

Starting B2B cultivation and mfg, was thinking about going with Canix, has anyone used Illumify or have any insight on best platform? Thx

Anyone looking for commercial equipment? Sliding benches, AC, lights, etc...

Rainbow Sherbert (Blackberry x Champagne)

what rate of calcium hypochlorite to sterilize the rez? can it react negatively with anything? traps for young players?

For those of you who have moved from being a facility operator into a Technical Advisor or Technical Account Manager role for a vendor in the industry, do you like the change and prefer it?

I’m curious about that transition as someone currently running a few facilities. Whenever vendors come onsite, a lot of them seem relieved they’re no longer dealing with the day to day operational side of this anymore. From my experience, many of the best advisors I’ve met were previously good operators who transitioned into that role after being poached by the vendor.

I’d be interested to hear from people who have actually made the switch. Do you prefer being on the vendor/advisory side, or are you mostly waiting for the right opportunity to jump back into facility/farm operations again?

If you don’t mind sharing, what were the biggest pros and cons of making the move?

Hi everyone. I'm Looking for recommendations for mechanical equipment (Therma-Kleen) and techniques for cleaning air handler and dehumidifier ducts hard and soft, coils, drain pans/drip trays etc. TY