Jacks 321 vs Masterblend/Calnit/Epsom salt analysis

[NeWcS]

Sorry, but your reply is very hard to follow.
Download a program called 'hydrobuddy' and play with that some. It won't give you the same numbers as a meter, just elemental numbers. But it may help you better understand what you're working with.

 

[Delps8]

Here is a side-by-side between MB and Jacks. I don't see a a big difference, just that Jacks formula has tons more mg and sulfer.

Masterblend: MB 2.4g, Calnit 2.4g, Epsom 1.2g
Jacks: Jacks 3.6g, Calnit 2.4g, Epsom 1.1g

Check the jacks site for the most recent formulation. Last I checked, it was 3.79-2.52-0.99.

I’ve used it without the Epsom with Gorilla Glue auto but one other strain seemed to do better with it.

 

[bobbjoedope]

Hi all, I've been using MB for a few grows now. Something that I can't quite grasp is the actual NPK. I assumed just add all 3 together to get a final NPK of 19.5-18-38, which seems crazy high.

After speaking to 2 MB reps on the phone recently, they both said the NPK is actually half of that because when you add in all three elements it changes the dilution or something and that it is measured by weight. So the actual npk after mixing the Epson and calcium is more like 10-9-19.

Can anyone explain this logic to me?

 

[7CardBud]

You need to divide the weight of each element by the total weight of the salts used.
A ballpark mix for a 55gal barrel would be 100-100-50.
Total weight in grams for each is 19.5N-18P-38K-19Ca-5Mg-6.5S.
Divide all elements by 250 for NPK and percentages of the salt mix.
8-7-15 7.5Ca 2Mg 2.5S

 

[Wastei]

Check the jacks site for the most recent formulation. Last I checked, it was 3.79-2.52-0.99.

I’ve used it without the Epsom with Gorilla Glue auto but one other strain seemed to do better with it.

I saw no real benefits with the new ratio. I think it only worsen the mineral ratios. I see the new ratio as a strategy to sell more products. Epsom salt is the cheapest input.

 

[bobbjoedope]

You need to divide the weight of each element by the total weight of the salts used.

ah, so I divide by the weight of the nutes. I'm having trouble with your math though. So, Let's assume I'm going off the mixing ratio of 2:1 (MB & CA : MS). (The actual mixing rations on MB's website is wack.) A lot of people do 12g MB&CAL with 6g MS.

So, at full strength, with all 3 together- master blend, epsom, calcium I would divide the NPK by 2.5 (because the epsom is half the amount of the other 2). So regardless of the amount of nutrient solution, it looks like the final NPK is 7.8-7.2-15.2. Is my math/understanding correct?

Thanks for the help!

 

[7CardBud]

ah, so I divide by the weight of the nutes. I'm having trouble with your math though. So, Let's assume I'm going off the mixing ratio of 2:1 (MB & CA : MS). (The actual mixing rations on MB's website is wack.) A lot of people do 12g MB&CAL with 6g MS.

So, at full strength, with all 3 together- master blend, epsom, calcium I would divide the NPK by 2.5 (because the epsom is half the amount of the other 2). So regardless of the amount of nutrient solution, it looks like the final NPK is 7.8-7.2-15.2. Is my math/understanding correct?

Thanks for the help!

Correct, everything is divided by 2.5. The NPK, Calcium, Sulfur, Boron...etc.

 

[bobbjoedope]

Correct, everything is divided by 2.5. The NPK, Calcium, Sulfur, Boron...etc.

Thank you!!!