New Grower 1st Autopot/Autoflower Run: 2 Toof Decay by Mephisto Genetics!

[Saven]

Day 12: (12/03/20) Water, Pictures & Refilling Humidifier

Watered at 6.4 pH

 

[elcoloan]

Are you usng only Mega Crop? no Ca or Mg sups? I think you might need them or at least bump a bit the MC... assuming everyting else is in check which seems to be the case.

 

[Saven]

Are you usng only Mega Crop? no Ca or Mg sups?

Yeah only Megacrop 2 Part, A & B. There website said I probably wouldn't need CAL-MAG but I'm used LEDs and that usually means I'll need it.

Were you just curious? Or do you think you see a deficiency starting?

 

[elcoloan]

Yeah only Megacrop 2 Part, A & B. There website said I probably wouldn't need CAL-MAG but I'm used LEDs and that usually means I'll need it.

Were you just curious? Or do you think you see a deficiency starting?

They do look quite light on top and it might just be me but i do see what looks like soon-to-be blotches.

 

[Saven]

They do look quite light on top and it might just be me but i do see what looks like soon-to-be blotches.

Appreciate it, I'll add some CAL-MAG starting tomorrow. I saw those blotches too. I chalked it up to me accidentally getting water on the leaves, but I doubt some CAL-MAG would do anything negative. I probably should have been adding it from the jump.

 

[elcoloan]

Appreciate it, I'll add some CAL-MAG starting tomorrow. I saw those blotches too. I chalked it up to me accidentally getting water on the leaves, but I doubt some CAL-MAG would do anything negative. I probably should have been adding it from the jump.

Or maybe just bump the MC a bit. Oh and i'd do a slurry test before anything just to be on the safe side in regards to medium pH... and also better if @Mañ'O'Green could give you his input on the matter before you go adding or increasing anything.

Here's the slurry test.
Taken form https://www.canna-uk.com/using_canna_coco:

COCO measuring method

The most reliable method for measuring the nutrient levels in coco is using the 1: 1.5 extraction method.
EC and pH of the root environment can be determined by using this method. The pH and EC of the drain water generally deviates from the actual root situation, as coco is able to retain and release elements.

1. Take a sample of CANNA COCO from the slabs or pots (photo 1). This can be done with a soil core sampler or a trowel. To get a representative sample the coco must be collected from as many places as possible.
2. Collect the sample in a bowl and determine whether it contains the right amount of moisture. The coco has the right amount of moisture if moisture disappears between your fingers when you squeeze it (photo 2). Add demineralised water if necessary and mix the coco.
3. Take a 250 ml measuring jug and fill it with 150 ml of demineralised water. Add coco to the 250 ml mark (photo 3). Fully mix and allow the slurry to settle for at least two hours.
4. Mix again and measure the pH.
5. Filter this material and measure the EC.

A 1:1.5 analysis can preferably be done after 3 to 4 weeks. The target values for EC are between 1.1 and 1.3, for the pH, between 5.5 and 6.2. Very high EC values increase the risk of burning symptoms. To limit the risk of burning symptoms, the coco can be rinsed with acidified water (pH 5.8: acidify with CANNA pH - growth).

 

[Mañ'O'Green]

Stop do not add Cal-mag Green Leaf 2 part has plenty even for coco. Your starting water is also adding about 70 PPM of calcium. The spots on that baby plant is genetic and not a deficiency.

 

[Mañ'O'Green]

Day 2: (11/23/20) First Watering

I just took what Megacrop Part A + B had on the bag and half'd it. Simple as that.

Megacrop Part A + B and pH Down from Advanced Nutrients.
Starting Tap Water = 7.6 pH & 120 ppm
After Part A = 7.1 pH & 205 ppm
After Part B = 7.0 pH & 350 ppm
After pH Down = 6.2 pH

Trying to calibrate it weekly, might be excessive.

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RH inside my tent last night, I added a small humidifier before I went to bed.

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Just a lil guy, nothing special.

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This is what it is this morning. 55 RH.

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& just some extra pictures because I like documenting. The 2 part Megacrop dissolved very nicely.

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Thank you for checking back in.

EDIT:

Started with 5 gallons of water.
Math wanted me to add 3.75g of Part B and 6.25g of Part B

How much I actually watered my pots? Probably like 500mL-700mL because I think I let it dry it too much last time.

Dont dip the PH pen in the test solution bottle you will contaminate/dilute it.

It would be better to make a double or triple strength solution and then add that to water to get to your target PPM. The reason I say that it is hard to get an evenly mixed small spoon of Part A in just a few grams. It will be better above 10 grams. The concentrated solution of part A will last a few days without worries just shake well be for you use it. Part A is about 190 PPM per gram.

 

[elcoloan]

Stop do not add Cal-mag Green Leaf 2 part has plenty even for coco. Your starting water is also adding about 70 PPM of calcium. The spots on that baby plant is genetic and not a deficiency.

Darn it! I still gotta learn to read them better. Hope you see this on time @Saven , i apologize for confusing you.

 

[Saven]

Darn it! I still gotta learn to read them better. Hope you see this on time @Saven , i apologize for confusing you.

No, you're good! I just had it in mind for tomorrow, but I didn't do anything different today. Watering was already done before the pics were posted.

Dont dip the PH pen in the test solution bottle you will contaminate/dilute it.

It would be better to make a double or triple strength solution and then add that to water to get to your target PPM. The reason I say that it is hard to get an evenly mixed small spoon of Part A in just a few grams. It will be better above 10 grams. The concentrated solution of part A will last a few days without worries just shake well be for you use it. Part A is about 190 PPM per gram.

Thanks for coming in and sharing information. I'll brushen up on proper pH meter use and storage, lol. That's good information for Part A. I was wondering from the jump about how I was going to figure out how to make a concentrated 5 gallon solution to eventually add to the 5-7 gallons of dechlorinated water in the res for my autopots. This is a good start.