Using Calcium sulfate during flower

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Mike Parent

Active Member
Just an FYI We run Masterblend throughout. This grow we replaced half of the Cal Nit with Calcium Sulfate at week four of flower. They didn’t miss the extra N and look healthier than ever. I’m undecided whether to totally replace the CN with CS after week 6 , on this 10 week strain.
The MB supplies 7 parts N at the strength we feed at. ( 150% full strength)
 

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chickenpoop

chickenpoop

Well-Known Member
I’m organic, but my brother and Mean gene gardens from youtube both use masterblend, or variations of it. I think switching to the calcium sulfate post week 6 is a good idea. Your plants look plenty green and flush with leaves. Extra “gypsum” CS type nutrients will boost terps and be a nice alternative source for calcium.
 
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Mike Parent

Active Member
RottyRzr said:
Ive been running Jacks with calcium nitrate and have been wanting to reduce the nitrogen during flower but not reducing the calcium. I've not tried calcium sulfate but could you tell me how much per gallon you are using?
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To get to the Calcium PPM right I’m running 3 Gms CS per gal. I based this on the fact that 2.4 Gms CS per liter, (3.8 Ltires per gals) will supply 550 ppm of CA. That’s appx 144 ppm per gal. I upped it to 3 Gms. Bringing the CA ppm to 180 per gal. JM2¢.
 
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Mike Parent

Active Member
“At 20C (68F), calcium sulfate dihydrate – the form most commonly available – has a solubility of around 2.4 g/L. In practice this means that you can have up to around 550 ppm of Ca in solution from calcium sulfate dihydrate before you observe any precipitation happening. This is way more than the normal 150-250 ppm of Ca that are used in final hydroponic nutrient solutions that are fed to plants. You could supply the entire plant requirement for calcium using calcium sulfate without ever observing any precipitate in solution. At the normal temperature range that hydroponic nutrient solutions are kept, the solubility of calcium sulfate is just not an issue. To add 10 ppm of Ca from calcium sulfate you need to add around 0.043g/L (0.163g/gal). You should however avoid using calcium sulfate for the preparation of solutions for foliar sprays as it will tend to form precipitates when the foliar spray dries on leaves, the leaves will then be covered with a thin film of gypsum, which is counterproductive.”
From Science in Hydroponics.

Jacks, by itself, has zero CA. All the CA in “Jacks 321” is from Calcium Nitrate
math says 3 Gms of CS per gallon will supply 180 ppm of Soluble, available CA.
 
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go go kid

go go kid

Well-Known Member
7CardBud said:
Sulphur is the least antagonistic of the plant nutrients, you can run over 150ppm without any issues.
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i know its great for terps production, i was judt wondering if it might even be benaficial and become the norm to getting great terps .


so there is N nitrogen in the yellow stuff then, i did wonder
mag sulphate is the other bag that comes with MB, you want some of the cal nitrate to go with that, so dont eradicate it alltogether
 
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RottyRzr

Well-Known Member
Mike Parent said:
“At 20C (68F), calcium sulfate dihydrate – the form most commonly available – has a solubility of around 2.4 g/L. In practice this means that you can have up to around 550 ppm of Ca in solution from calcium sulfate dihydrate before you observe any precipitation happening. This is way more than the normal 150-250 ppm of Ca that are used in final hydroponic nutrient solutions that are fed to plants. You could supply the entire plant requirement for calcium using calcium sulfate without ever observing any precipitate in solution. At the normal temperature range that hydroponic nutrient solutions are kept, the solubility of calcium sulfate is just not an issue. To add 10 ppm of Ca from calcium sulfate you need to add around 0.043g/L (0.163g/gal). You should however avoid using calcium sulfate for the preparation of solutions for foliar sprays as it will tend to form precipitates when the foliar spray dries on leaves, the leaves will then be covered with a thin film of gypsum, which is counterproductive.”
From Science in Hydroponics.

Jacks, by itself, has zero CA. All the CA in “Jacks 321” is from Calcium Nitrate
math says 3 Gms of CS per gallon will supply 180 ppm of Soluble, available CA.
Click to expand...
Where do you get your calcium sulfate? Are you just using pelletized gypsum? I tried searching for water soluble cs and didnt have any luck.
 
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Marbobley

Member
I used this stuff here. Im having some issues though with one of my plants not sure if its from this or not, I have another thread on it.61Nu+zgTaXL._SL1500_.jpg
 
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Marbobley

Member
Sorry I forgot to include the back of the bottle. This is the back of that bottle. Very strong sulfur smell almost nauseating bright yellow.





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Week4@inCharge

Week4@inCharge

Well-Known Member
My last grow I was anti calcium during flower, and this current grow I'm pro calcium, ordered some gypsum to remedy a little calcium deficiency going on. What's the recommended dosage for top dressing organic soil in pots?

EDIT: Looking around I found this..sound right?

Usage: Gypsum can be used in a few different ways, first you can mix it in water and water it into your cannabis containers or outdoors. You can mix in 3-4 tablespoons per gallon of water and pour over your plants.

www.greenavengerseeds.com

Top 10 Organic Growing Amendments for Cannabis

This is a detailed list of our top 10 organic growing amendments for cannabis. We list our favorites and give usage details for each one.
www.greenavengerseeds.com www.greenavengerseeds.com
.
 
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ShowMeDaBudz

Well-Known Member
Calcium is a phosphorus binder too. I use calcium acetate instead when i want to avoid the added nitrogen. $25 a kilo goes pretty far

Same stuff thats in Phoslo that they charge a fortune for and its Rx only.
www.bulksupplements.com

Calcium Acetate

What is Calcium Acetate? Calcium acetate is a calcium salt that has many unique uses ranging from a dietary supplement to a food stabilizer commonly used in candy. It can be made by soaking calcium carbonate (which can be found in eggshells or limestone) in vinegar and commonly forms into white...
www.bulksupplements.com www.bulksupplements.com
 
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