It keeps the Ca:Mg ratio very close to 2:1. As I understand the base formula was added as a result of introduction of LED's. I do 4:2 in flower of A to B and skip Epsom salt all together. 5-12-26 has been around since 2002 and before that it was marketed as a Jacks Classic "veggie formula"

3-2-1 is a very affordable and stable veg formula that you can use throughout flower if you choose to. Mg is slightly too high but that's kinda of a positive depending on growing method.

I've used 3-2-1 from start to finish many cycles in everything from Aero to Coir but I like to lower nitrogen more on some long flowering sativa's that's why I wanted to figure out what's in the different formulas.

I use an old Excel spreadsheet I got here years ago that you can add whatever input to. I find it easier and more straight forward to use than Hydrobuddy. I mostly use my phone and you need a PC for HydroBuddy.

10-30-20 is a pretty bad NPK for flowering Cannabis, way to much P for me to be comfortable. If you choose to use it you have to figure that one out yourself! It's more for real blossoms and flowers that needs high P to flourish. Cannabis has low to moderate P requirements. Excess MKP will only crash pH in containers.

Here's a copy of Jacks Clone 15-6-17:

Calcium Nitrate - 8kg
Magnesium Nitrate - 5.5kg
MKP - 6kg
Potassium Nitrate - 3.65kg
Rexolin APN - 150g

Total - 23.3kg


Cheers!
Hey Wastei, thanks for the post! is there any way you can link me to that excel sheet you mentioned?
 

Nutty sKunK

Well-Known Member
Happy to have you follow along Joe!

I'm curious about the new approach too with less light in flower. I munched on some leaves earlier and they were more potent than I expected, took me a little off guard. I suspect that lowering light hours all the way til harvest will alter the felt effects.
I would assume more cannabinoids due to less degradation by light/heat?
 

Wastei

Well-Known Member
I would assume more cannabinoids due to less degradation by light/heat?
I'm suspecting less degradation and different effects too. Certain outdoor grown plant that I've tried has been very medicinal and has always finished with only 5-6 hours of light and being fully developed, good yielder and potent.

That always stuck with me how that's even possible? That an outdoor plant with less light intensity and hours can yield more than an indoor counterpart with perfect environment and repeated 12 hours of light.

I hope I'm able to describe the difference in effects after drying. I've had a lot of the same cut the last 6 months so I'm very familiar with the effects.

Happy to have you following along!
 

Nutty sKunK

Well-Known Member
I'm suspecting less degradation and different effects too. Certain outdoor grown plant that I've tried has been very medicinal and has always finished with only 5-6 hours of light and being fully developed, good yielder and potent.

That always stuck with me how that's even possible? That an outdoor plant with less light intensity and hours can yield more than an indoor counterpart with perfect environment and repeated 12 hours of light.

I hope I'm able to describe the difference in effects after drying. I've had a lot of the same cut the last 6 months so I'm very familiar with the effects.

Happy to have you following along!
Im keen to see the results also! Perhaps less stress and more night strengthens the microbial network? I’m pretty sure during night cycle the plant gives more sugars etc to the rhizosphere.

I find outdoors forgiving so you don’t need to be 100% dialled in. Indoor growing really highlights imbalances in my experience.

No worries! Nice to look through :)
 
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