Calcium deficiency?

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I'm thinking this is calcium deficiency. Sour stomper day 27ish. Thoughts?
 

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Looks likely to me, Are you in coco under LED?
 
Yes i am. I charged it with calmag already in preparation for this but apparently not well enough for this cultivar. Only one doing it too.
 
I was doing the 2 part megacrop at around 300 ppm at the time. I'm not too impressed with it for coco, I liked their old formula better.

That's pretty light. I had the best luck in coco around 450-650ppm once in proper veg through flower. Good luck!
 
Your feeding too light! try this Schedule. It is for 14 Gallons after the first 2 weeks.

View attachment 1595439

This is primarily for mixing 14 gallons. If convenient, I and likely others would welcome seeing your 2-part feeding schedule in terms of grams per single liter or gallon. Otherwise, there's a lot of math to do; and we could more easily be able to compare your vs. GreenLeaf's dosages.
 
This is primarily for mixing 14 gallons. If convenient, I and likely others would welcome seeing your 2-part feeding schedule in terms of grams per single liter or gallon. Otherwise, there's a lot of math to do; and we could more easily be able to compare your vs. GreenLeaf's dosages.
You will get a bunch of little numbers with decimals that are difficult to measure, for example week 3-5:

A 10/14= .71429, B 17/14=1.2143, Mg 18/14= 1.286, K 3/14=.2143, P 3.5/14=.25, Gypsum 4/14=.2857 etc. Those little numbers mean a lot in the formula.

Use a 17 gallon tote with a stir pump and mix 14 gallons, It will last a week, it is easier to PH and the bigger mix will be more likely to balance even if you are of a little on one of the inputs. Remember this is for hydroponics/coco/
 
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