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Help - Day 45 - Crisis - What Do I Do Next

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ExNavyInSTL
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It's Day 45 ... just for the record, when I closed the tent on Day 44 everything seemed perfect.

But then Day 45.


First the setup:

Conditions: VPD Mostly Excellent (Fº / RH)

Media: Coco - Perlite - Vermiculite

Lighting: 42 DLI

Nutrients: Jacks 3-2-1 at 2.0 EC

Container: AutoPots / 5-gal Fabric / AirBase with natural air aerated into media with AirDome


When I opened the tent this morning, the first thing I see is Purple Lemonade #2 is not happy (photos below).

Symptoms:

  • Curl and Canoeing Leaves
  • Hyper Praying Position
  • Some leaves crunchy like paper

Diagnosis Actions:

  • Checked for soil moisture - excellent
  • Checked pH in AquaValve (AV) reservoir - 6.0
  • Checked EC in AV reservoir: WOW! It was in the low 4s EC
  • Checked EC & pH in other reservoirs all normal - all within decimal points of the master reservoir

Physical Actions:

  • Flushed the heck out of the coco with RO water
  • After 4 liters passed through I measured the Run Off water: 3.62 EC
  • After about 4 gallons passed through: EC 0.90
  • I stopped flushing

What Next ???:

This next part is the reason for the post. What do you do next?

I left a low EC, so there is some nutrients (just not sure how well balanced)

The Coco is soaked, but getting pumped in air at lower root zone

Do I give it some time without new nutrients ... like a dry-back period?

Or do I go back to normal now that the demon has been exorsized?

Extra Note:

  • I believe the soil is dark because of a recent Recharge dose about a week ago.
  • There are no odors
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“A farmer is a magician who produces money from the mud.”
― Amit Kalantri, Wealth of Words

 
Posted : December 7, 2022 2:03 pm
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monkeydo
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I’ve had something similar happen on a G13 run. In that case it was the EC being too high. The plant was fine and the output EC was indicating she wanted more so I bumped the feed slightly and had burned leaves the next day. These days I rarely exceed 1.4 EC and most of the time top off at 1.2 EC. I’d rather fertigate twice a day at lower EC than push the nutrients and have a repeat. Adding that second or even a third fertigation allows you to keep the plants happy at the lower rate. 

I’d lower the EC and feed at the lower rate for a few days while monitoring the output EC. She should tell you what she needs.

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Posted : December 7, 2022 2:31 pm
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ExNavyInSTL
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@monkeydo 

Thanks Monkey!

Can I take my 2.0 EC nutrient solution out of the Main Rez and dilute to about 1.2 EC?

Or should I make a fresh batch and lower the ingredients normally in Jack 3-2-1?

 

I ask because I have about 8 gallons in the current reservoir that I could dilute into a 1-gallon container.

“A farmer is a magician who produces money from the mud.”
― Amit Kalantri, Wealth of Words

 
Posted : December 7, 2022 2:50 pm
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I'd risk the dilution if the balance of nutrients is correct, just a little high. The normal rule is to mix fresh but I don't always follow the rules if I feel like I know what is going on.

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Posted : December 7, 2022 4:18 pm
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im_sparky
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@exnavyinstl @Monkeydo knows a heck of a lot more about EC and coco than me, but I wonder if that covers the whole issue. I say that because your DLI is quite high without added CO2 -- and I don't see you mention adding any. Some strains are more sensitive to DLI than others, and the leaves on that plant don't look just over-fed, but also crispy.  If it were me, I'd back the light off some, too. Just my 2-cents -- hope it helps.

 

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Posted : December 7, 2022 5:28 pm

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ExNavyInSTL
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@im_sparky 

As for the DLI: I think I am OK there. I follow Shane at Migro's suggestion of:

AUTO FLOWER LED LIGHT INTENSITY

Recommended LED PPF/PAR Values / DLI Based on 20 hrs. of light.

  • Seedlings 150 - 200 umol / DLI 10.80 - 14.4 moles per day
  • Veg up to 9" 450 umol / DLI 32.40 moles per day
  • Early bloom 500 umol / DLI 36.00 moles per day
  • Mid bloom 650 umol / DLI 46.80 moles per day
  • Late bloom 750 umol / DLI 54.00 moles per day
  • Ripen 400 umol / DLI 28.80 moles per day

Use extreme caution going 700 umol or higher @ 20 hrs/day this could cause leaf burn

“A farmer is a magician who produces money from the mud.”
― Amit Kalantri, Wealth of Words

 
Posted : December 7, 2022 5:59 pm
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@exnavyinstl No doubt that Shane knows his stuff. Aren't you in early bloom but with a DLI of 42? Other sources indicate that beyond 28 DLI at 7-8 weeks needs supplemental CO2 (Photone's Optimal DLI Chart) due to deficit. Also, there is nuance with strain variability.

To see a World in a Grain of Sand, And a Heaven in a Wild Flower,
Hold Infinity in the palm of your hand, And Eternity in an hour.
― William Blake

 
Posted : December 7, 2022 6:30 pm
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Smg_grows
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Hello dude, 

I have used these systems for a long time and speak with Jason the owner of autopot frequently. 

Things to do. 

Salts accumulate on top of the surface on autopots. So if you need to flush. Flush twice. 

Flush your lines thoroughly with peroxide solution. 

Reset water reseviour and again thoroughly clean with peroxide. 

I always run a lowe ec on autopots always. 

Speak with Jason at autopot. He is always happy to help. He will leave you a voice mail. On instagram. 

 

Kind regards 

 

Smg

 

 
Posted : December 7, 2022 6:39 pm
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@smg_grows 

Thank you. I don't think I have an issue with the AutoPot. The other three are fine. I love my AutoPots. 

I gave the plant a great flushing. I ran a bunch of RO water through. The run-off of the EC is now safely under 1.0. 

My plan is to keep the valve shut off to that one unit, And slowly raise the EC over the next couple of days.

For instance, I filled up the one-of-four unit's valve reservoir with 1.0 tonight.

If the plant is still drinking in the AM and the small reservoir is lower (and the plant looks to have stabilized), I'll bump up the EC to 1.3. 

Plus, my next addition to the main reservoir (12-gallon) is going to be a lower EC. Nothing drastic because the other three plants are now rocking and rolling.

 

 

 

“A farmer is a magician who produces money from the mud.”
― Amit Kalantri, Wealth of Words

 
Posted : December 7, 2022 11:58 pm
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ExNavyInSTL
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@im_sparky 

You may be right about this being a combination event. I was away from the house when I was replying earlier.

But, when I got home, the light measured 54 DLI - yikes.

This plant is Purple Lemonade #2, but I also noticed that PL#1 had some twisted leaves now. #1 has been a lot stronger and further along than #2. So, that might be why it hasn't reacted as harshly.

Nonetheless, the light is all the way down to 34 DLI now. 

 

 

 

“A farmer is a magician who produces money from the mud.”
― Amit Kalantri, Wealth of Words

 
Posted : December 8, 2022 12:10 am
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